Semiconductor device

Abstract

In the present invention, a semiconductor device comprises a semiconductor element, a plurality of leads, and an encapsulating resin that covers the semiconductor element and the plurality of leads. The encapsulating resin has a resin rear surface and first to third resin side surfaces. The plurality of leads include a plurality of first leads that are arranged in a first direction. Each first lead has a first mounting surface that is exposed from the resin rear surface. The first mounting surface reaches the first resin side surface, and is set apart from the second resin side surface and the third resin side surface. The first mounting surface has a first length that follows along a second direction. The first lengths of the first leads among the plurality of first leads that are positioned at both ends in the first direction are longer than the first lengths of the other first leads.

Description

Semiconductor Devices

[0001] The present disclosure relates to semiconductor devices.

[0002] Patent Document 1 discloses an example of a conventional semiconductor device. The semiconductor device disclosed in this document includes a semiconductor element, a plurality of leads, and a sealing resin. The plurality of leads have mounting surfaces exposed from the back surface of the sealing resin. These mounting surfaces are arranged along the side surface of the sealing resin.

[0003] Japanese Patent Application Laid-Open No. 2022-87155

[0004] The mounting surfaces of the multiple leads are joined to a circuit board or the like by a conductive bonding material such as solder. If excessive stress occurs in any of these conductive bonding materials, it can cause cracks or peeling of the conductive bonding material.

[0005] An object of the present disclosure is to provide an improved semiconductor device compared to conventional semiconductor devices. In particular, in view of the above-mentioned circumstances, an object of the present disclosure is to provide a semiconductor device that can suppress the generation of excessive stress in a conductive bonding material used for mounting.

[0006] A first aspect of the present disclosure provides a semiconductor device comprising a semiconductor element, multiple leads, and a sealing resin covering the semiconductor element and at least a portion of each of the multiple leads. The sealing resin has a resin back surface facing the thickness direction of the semiconductor element, a first resin side surface along a first direction intersecting the thickness direction, and second and third resin side surfaces along a second direction intersecting the thickness direction and the first direction. The multiple leads include multiple first leads arranged in the first direction, each of the multiple first leads having a first mounting surface exposed from the resin back surface. The first mounting surface reaches the first resin side surface and is spaced apart from the second and third resin side surfaces. Regarding a first length, which is the length in the second direction of the first mounting surfaces of the multiple first leads, the first lengths of the multiple first leads located at both ends in the first direction are longer than the first lengths of any of the remaining first leads.

[0007] A second aspect of the present disclosure provides a semiconductor device comprising a semiconductor element, multiple leads, and an encapsulating resin covering the semiconductor element and at least a portion of each of the multiple leads. The encapsulating resin has a resin back surface facing the thickness direction of the semiconductor element, a first resin side surface and a fourth resin side surface along a first direction intersecting the thickness direction, and a second resin side surface and a third resin side surface along a second direction intersecting the thickness direction and the first direction. The multiple leads include multiple first leads, multiple fourth leads, and a corner lead. The multiple first leads are arranged in the first direction along the first resin side surface, and the multiple fourth leads are arranged in the first direction along the fourth resin side surface. Each of the multiple first leads has a first mounting surface exposed from the resin back surface. Each of the multiple fourth leads has a fourth mounting surface exposed from the resin back surface. The corner leads have a corner mounting surface exposed from the resin back surface on the outer side in the first direction relative to the first mounting surfaces of the multiple first leads or the fourth mounting surfaces of the multiple fourth leads. The corner mounting surface has a first portion that reaches the first resin side surface or the fourth resin side surface and is spaced apart from the second resin side surface and the third resin side surface, and a second portion that reaches the second resin side surface or the third resin side surface and is spaced apart from the first resin side surface and the fourth resin side surface. The first portion and the second portion are connected to each other.

[0008] According to the above configuration, it is possible to prevent excessive stress from being generated in the conductive bonding material used for mounting in the semiconductor device.

[0009] Other features and advantages of the present disclosure will become more apparent from the following detailed description taken in conjunction with the accompanying drawings.

[0010] FIG. 1 is a perspective view showing a semiconductor device according to a first embodiment of the present disclosure. FIG. 2 is a perspective view showing a semiconductor device according to a first embodiment of the present disclosure. FIG. 3 is a partial perspective view showing a semiconductor device according to a first embodiment of the present disclosure. FIG. 4 is a plan view showing a semiconductor device according to a first embodiment of the present disclosure. FIG. 5 is a bottom view showing a semiconductor device according to a first embodiment of the present disclosure. FIG. 6 is a front view showing a semiconductor device according to a first embodiment of the present disclosure. FIG. 7 is a rear view showing a semiconductor device according to a first embodiment of the present disclosure. FIG. 8 is a right side view showing a semiconductor device according to a first embodiment of the present disclosure. FIG. 9 is a left side view showing a semiconductor device according to a first embodiment of the present disclosure. FIG. 10 is a cross-sectional view taken along line X-X in FIG. 4. FIG. 11 is a cross-sectional view taken along line XI-XI in FIG. 4. FIG. 12 is a cross-sectional view taken along line XII-XII in FIG. 4. FIG. 13 is a partially enlarged plan view showing a semiconductor device according to a first embodiment of the present disclosure. FIG. 14 is a partially enlarged plan view showing a semiconductor device according to a first embodiment of the present disclosure. FIG. 15 is a partially enlarged plan view showing a semiconductor device according to a first embodiment of the present disclosure. Fig. 16 is a partially enlarged plan view showing a semiconductor device according to the first embodiment of the present disclosure. Fig. 17 is a bottom view showing a first modified example of the semiconductor device according to the first embodiment of the present disclosure. Fig. 18 is a bottom view showing a semiconductor device according to a second embodiment of the present disclosure. Fig. 19 is a bottom view showing a semiconductor device according to a third embodiment of the present disclosure. Fig. 20 is a bottom view showing a semiconductor device according to a fourth embodiment of the present disclosure. Fig. 21 is a partially enlarged plan view showing a second modified example of the semiconductor device according to the first embodiment of the present disclosure. Fig. 22 is a partially enlarged plan view showing a third modified example of the semiconductor device according to the first embodiment of the present disclosure. Fig. 23 is a plan view showing a semiconductor device according to a fifth embodiment of the present disclosure.

[0011] Preferred embodiments of the present disclosure will now be described in detail with reference to the drawings.

[0012] The terms "first," "second," "third," etc. in this disclosure are used for identification purposes only and are not intended to impose any ranking on their objects.

[0013] In this disclosure, unless otherwise specified, "a certain object A is formed on a certain object B" and "a certain object A is formed on a certain object B" include "a certain object A is formed directly on a certain object B" and "a certain object A is formed on a certain object B with another object interposed between the certain object A and the certain object B." Similarly, "a certain object A is disposed on a certain object B" and "a certain object A is disposed on a certain object B" include "a certain object A is disposed directly on a certain object B" and "a certain object A is disposed on a certain object B with another object interposed between the certain object A and the certain object B" unless otherwise specified. Similarly, "a certain object A is located on a certain object B" includes "a certain object A is located on a certain object B with a certain object A in contact with the certain object B" and "a certain object A is located on a certain object B with another object interposed between the certain object A and the certain object B." Furthermore, unless otherwise specified, the phrase "an object A overlaps an object B when viewed in a certain direction" includes "an object A overlaps the entire object B" and "an object A overlaps a part of an object B." Furthermore, in the present disclosure, "a surface A faces in (one side or the other side of) direction B" is not limited to the case where the angle of surface A with respect to direction B is 90°, but also includes the case where surface A is tilted with respect to direction B.

[0014] 1 to 16 show a semiconductor device according to a first embodiment of the present disclosure. The semiconductor device A1 of this embodiment includes a semiconductor element 1, a sealing resin 2, and a plurality of leads 4 to 9. The semiconductor device A1 is a so-called QFN (Quad Flat No Leaded Package) type semiconductor device, but the basic configuration of the semiconductor device according to the present disclosure is not limited in any way.

[0015] FIG. 1 is a perspective view showing the semiconductor device A1. FIG. 2 is a perspective view showing the semiconductor device A1. FIG. 3 is a partial perspective view showing the semiconductor device A1. FIG. 4 is a plan view showing the semiconductor device A1. FIG. 5 is a bottom view showing the semiconductor device A1. FIG. 6 is a front view showing the semiconductor device A1. FIG. 7 is a rear view showing the semiconductor device A1. FIG. 8 is a right side view showing the semiconductor device A1. FIG. 9 is a left side view showing the semiconductor device A1. FIG. 10 is a cross-sectional view taken along line X-X in FIG. 4. FIG. 11 is a cross-sectional view taken along line XI-XI in FIG. 4. FIG. 12 is a cross-sectional view taken along line XII-XII in FIG. 4. FIG. 13 is a partial enlarged plan view showing the semiconductor device A1. FIG. 14 is a partial enlarged plan view showing the semiconductor device A1. FIG. 15 is a partial enlarged plan view showing the semiconductor device A1. FIG. 16 is a partial enlarged plan view showing the semiconductor device A1.

[0016] In these figures, an example of the thickness direction in the present disclosure is denoted as thickness direction z. A direction perpendicular to thickness direction z is defined as first direction x. A direction perpendicular to thickness direction z and first direction x is defined as second direction y.

[0017] Semiconductor element 1: When the semiconductor device A1 is mounted on a circuit board or the like to form part of an electric circuit, the semiconductor element 1 performs the main electrical function of the semiconductor device A1. The specific configuration of the semiconductor element 1 is not limited in any way, and examples include an LSI (Large Scale Integration), an IC (Integrated Circuit), etc. The semiconductor element 1 of this embodiment has a rectangular shape with two sides along the first direction x and two sides along the second direction y when viewed in the z direction.

[0018] Sealing resin 2: The sealing resin 2 covers the semiconductor element 1 and a portion of each of the leads 4 to 9. The specific configuration of the sealing resin 2 is not limited, and the constituent material may include, for example, epoxy resin. As shown in FIGS. 1, 2, and 4 to 16, the sealing resin 2 of this embodiment has a resin main surface 21, a resin back surface 22, a first resin side surface 23, a second resin side surface 24, a third resin side surface 25, and a fourth resin side surface 26.

[0019] The resin main surface 21 is a surface facing the z1 side in the z direction, and in the illustrated example, is a flat rectangular surface. The resin back surface 22 is a surface facing the z2 side in the z direction, and in the illustrated example, is a flat rectangular surface. The first resin side surface 23 is a surface extending along the first direction x and z directions, and facing the y1 side in the second direction y. The second resin side surface 24 is a surface extending along the second direction y and z directions, and facing the x1 side in the first direction x. The third resin side surface 25 is a surface extending along the second direction y and z directions, and facing the x2 side in the first direction x. The fourth resin side surface 26 is a surface extending along the first direction x and z directions, and facing the y2 side in the second direction y.

[0020] In this embodiment, the length of the first resin side surface 23 and the fourth resin side surface 26 in the first direction x is longer than the length of the second resin side surface 24 and the third resin side surface 25 in the second direction y.

[0021] The multiple leads 4 to 9 perform functions such as supporting the semiconductor element 1 and providing a conductive path to the semiconductor element 1. The specific configuration of the multiple leads 4 to 9 is not limited in any way. The multiple leads 4 to 9 include, for example, Cu (copper), Ni (nickel), Fe (iron), and alloys thereof as constituent materials. In the following description, the multiple leads 4 to 9 will be distinguished and described as multiple first leads 4, multiple second leads 5, multiple third leads 6, multiple fourth leads 7, multiple corner leads 8, and center lead 9.

[0022] First lead 4: As shown in Figures 1 to 6 and 12 to 14, the multiple first leads 4 are arranged in the first direction x. The first lead 4 has a first thick portion 41, a second thin portion 42, a first mounting surface 43, and a first end surface 44.

[0023] The first thick portion 41 is a portion of the first lead 4 that is relatively thicker in the thickness direction z (compared to the second thin portion 42). The first thick portion 41 has a first mounting surface 43 and a first end surface 44. The second thin portion 42 is a portion of the first lead 4 that is relatively thinner in the thickness direction z (compared to the first thick portion 41) and is spaced from the resin back surface 22 on the z1 side in the thickness direction z. In this embodiment, the semiconductor element 1 is mounted on the second thin portion 42. The shape of the second thin portion 42 as viewed in the thickness direction z is set appropriately depending on, for example, the position where the semiconductor element 1 is mounted.

[0024] The first mounting surface 43 faces the z2 side in the thickness direction z and is exposed from the resin back surface 22 of the sealing resin 2. In the illustrated example, the first mounting surface 43 has a shape that extends along the second direction y. In the illustrated example, the first mounting surface 43 is flush with the resin back surface 22. The first mounting surface 43 reaches the first resin side surface 23 and is separated from the second resin side surface 24, the third resin side surface 25, and the fourth resin side surface 26.

[0025] The first end surface 44 faces the y1 side in the second direction y and is exposed from the first resin side surface 23 of the sealing resin 2. In the illustrated example, the first mounting surface 43 and the first end surface 44 are connected. However, a concave surface or the like may be interposed between the first mounting surface 43 and the first end surface 44. A plating layer (not shown) containing, for example, Sn (tin) may be appropriately provided on the first mounting surface 43 and the first end surface 44. In the illustrated example, the first end surface 44 is flush with the first resin side surface 23.

[0026] The arrangement pitch P1 of the first mounting surfaces 43 of the multiple first leads 4 is not particularly limited. In the illustrated example, the arrangement pitch P1 of the multiple first mounting surfaces 43 is constant. Furthermore, the width W1, which is the size of the first mounting surfaces 43 in the first direction x, is not particularly limited. In the illustrated example, the width W1 of the multiple first mounting surfaces 43 is constant.

[0027] With regard to the first length L1, which is the length of the multiple first leads 4 in the second direction y, the first length L1 of the first leads 4 located at both ends in the first direction x among the multiple first leads 4 is longer than the first length L1 of any of the other first leads 4. In other words, the first length L1 of the first lead 4 sandwiched between two first leads 4 located at both ends in the first direction x is shorter than the first length L1 of the first leads 4 at both ends in the first direction x.

[0028] In the illustrated example, the first length L1 of the first leads 4 located on the outer side in the first direction x is longer than the first length L1 of the first leads 4 located on the center side in the first direction x. In other words, when the first lengths L1 of the first leads 4 adjacent to each other are compared, the first length L1 of the first leads 4 located on the outer side in the first direction x is longer than the first length L1 of the first leads 4 located on the inner side in the first direction x.

[0029] Second lead 5: The multiple second leads 5 are arranged in the first direction x as shown in Figures 2 to 5, 8, 10, 13, and 15. The second lead 5 has a second thick portion 51, a second thin portion 52, a second mounting surface 53, and a second end surface 54.

[0030] The second thick portion 51 is a portion of the second lead 5 that is relatively thicker in the thickness direction z (compared to the second thin portion 52). The second thick portion 51 has a second mounting surface 53 and a second end surface 54. The second thin portion 52 is a portion of the second lead 5 that is relatively thinner in the thickness direction z (compared to the second thick portion 51) and is spaced from the resin back surface 22 on the z1 side in the thickness direction z. In this embodiment, the semiconductor element 1 is mounted on the second thin portion 52. The shape of the second thin portion 52 as viewed in the thickness direction z is set appropriately depending on, for example, the position where the semiconductor element 1 is mounted.

[0031] The second mounting surface 53 faces the z2 side in the thickness direction z and is exposed from the resin back surface 22 of the sealing resin 2. In the illustrated example, the second mounting surface 53 has a shape that extends along the first direction x. In the illustrated example, the second mounting surface 53 is flush with the resin back surface 22. The second mounting surface 53 reaches the second resin side surface 24 and is spaced apart from the first resin side surface 23, the fourth resin side surface 26, and the third resin side surface 25.

[0032] The second end surface 54 faces the x1 side in the first direction x and is exposed from the second resin side surface 24 of the sealing resin 2. In the illustrated example, the second mounting surface 53 and the second end surface 54 are connected. However, a concave surface or the like may be interposed between the second mounting surface 53 and the second end surface 54. A plating layer (not shown) containing, for example, Sn (tin) may be appropriately provided on the second mounting surface 53 and the second end surface 54. In the illustrated example, the second end surface 54 is flush with the second resin side surface 24.

[0033] The arrangement pitch P2 of the second mounting surfaces 53 of the multiple second leads 5 is not particularly limited. In the illustrated example, two second leads 5 are arranged in the second direction y, with the center lead 9 sandwiched between them. The arrangement pitch P2 of the two second mounting surfaces 53 on the y1 side of the second direction y is the same as the arrangement pitch P2 of the two second mounting surfaces 53 on the y2 side of the second direction y. Furthermore, the width W2, which is the size of the second mounting surfaces 53 in the second direction y, is not particularly limited. In the illustrated example, the width W2 of the multiple second mounting surfaces 53 is constant.

[0034] The second length L2 of the second leads 5 in the second direction y is not limited in any way and is, for example, constant in this embodiment. In the illustrated example, the second length L2 of the second leads 5 is shorter than the first length L1 of any of the first leads 4.

[0035] Third lead 6: The multiple third leads 6 are arranged in the first direction x, as shown in Figures 2 to 5, 8, 10, 13, and 15. The third lead 6 has a third thick portion 61, a third thin portion 62, a third mounting surface 63, and a third end surface 64.

[0036] The third thick portion 61 is a portion of the third lead 6 that is relatively thicker in the thickness direction z (compared to the third thin portion 62). The third thick portion 61 has a third mounting surface 63 and a third end surface 64. The third thin portion 62 is a portion of the third lead 6 that is relatively thinner in the thickness direction z (compared to the third thick portion 61) and is spaced from the resin back surface 22 on the z1 side in the thickness direction z. In this embodiment, the semiconductor element 1 is mounted on the third thin portion 62. The shape of the third thin portion 62 as viewed in the thickness direction z is set appropriately depending on, for example, the position where the semiconductor element 1 is mounted.

[0037] The third mounting surface 63 faces the z2 side in the thickness direction z and is exposed from the resin back surface 22 of the sealing resin 2. In the example shown, the third mounting surface 63 has a shape that extends along the first direction x. In the example shown, the third mounting surface 63 is flush with the resin back surface 22. The third mounting surface 63 reaches the third resin side surface 25 and is separated from the first resin side surface 23, the fourth resin side surface 26, and the second resin side surface 24.

[0038] The third end surface 64 faces the x2 side in the first direction x and is exposed from the third resin side surface 25 of the sealing resin 2. In the illustrated example, the third mounting surface 63 and the third end surface 64 are connected. However, a concave surface or the like may be interposed between the third mounting surface 63 and the third end surface 64. A plating layer (not shown) containing, for example, Sn (tin) may be appropriately provided on the third mounting surface 63 and the third end surface 64. In the illustrated example, the third end surface 64 is flush with the third resin side surface 25.

[0039] The arrangement pitch P3 of the third mounting surfaces 63 of the multiple third leads 6 is not particularly limited. In the illustrated example, two third leads 6 are arranged in the second direction y, with the center lead 9 sandwiched between them. The arrangement pitch P3 of the two third mounting surfaces 63 on the y1 side of the second direction y is the same as the arrangement pitch P3 of the two third mounting surfaces 63 on the y2 side of the second direction y. Furthermore, the width W3, which is the size of the third mounting surfaces 63 in the second direction y, is not particularly limited. In the illustrated example, the width W3 of the multiple third mounting surfaces 63 is constant.

[0040] The third length L3, which is the length of the third leads 6 in the second direction y, is not limited in any way and is, for example, constant in this embodiment. In the illustrated example, the third length L3 of the third leads 6 is shorter than the first length L1 of any of the first leads 4.

[0041] Fourth lead 7: The multiple fourth leads 7 are arranged in the first direction x, as shown in Figures 2 to 5, 7, 12, 15, and 16. The fourth lead 7 has a fourth thick portion 71, a fourth thin portion 72, a fourth mounting surface 73, and a fourth end surface 74.

[0042] The fourth thick portion 71 is a portion of the fourth lead 7 that is relatively thicker in the thickness direction z (compared to the fourth thin portion 72). The fourth thick portion 71 has a fourth mounting surface 73 and a fourth end surface 74. The fourth thin portion 72 is a portion of the fourth lead 7 that is relatively thinner in the thickness direction z (compared to the fourth thick portion 71) and is spaced from the resin back surface 22 on the z1 side in the thickness direction z. In this embodiment, the semiconductor element 1 is mounted on the fourth thin portion 72. The shape of the fourth thin portion 72 as viewed in the thickness direction z is set appropriately depending on, for example, the position where the semiconductor element 1 is mounted.

[0043] The fourth mounting surface 73 faces the z2 side in the thickness direction z and is exposed from the resin back surface 22 of the sealing resin 2. In the example shown, the fourth mounting surface 73 has a shape that extends along the second direction y. In the example shown, the fourth mounting surface 73 is flush with the resin back surface 22. The fourth mounting surface 73 reaches the fourth resin side surface 26 and is separated from the second resin side surface 24, the third resin side surface 25, and the first resin side surface 23.

[0044] The fourth end surface 74 faces the y2 side in the second direction y and is exposed from the fourth resin side surface 26 of the sealing resin 2. In the illustrated example, the fourth mounting surface 73 and the fourth end surface 74 are connected. However, a concave surface or the like may be interposed between the fourth mounting surface 73 and the fourth end surface 74. A plating layer (not shown) containing, for example, Sn (tin) may be appropriately provided on the fourth mounting surface 73 and the fourth end surface 74. In the illustrated example, the fourth end surface 74 is flush with the fourth resin side surface 26.

[0045] The arrangement pitch P4 of the fourth mounting surfaces 73 of the multiple fourth leads 7 is not particularly limited. In the illustrated example, the arrangement pitch P4 of the multiple fourth mounting surfaces 73 is constant. Furthermore, the width W4, which is the size of the fourth mounting surfaces 73 in the first direction x, is not particularly limited. In the illustrated example, the width W4 of the multiple fourth mounting surfaces 73 is constant.

[0046] With regard to the fourth length L4, which is the length of the multiple fourth leads 7 in the second direction y, the fourth length L4 of the fourth leads 7 located at both ends in the first direction x among the multiple fourth leads 7 is longer than the fourth length L4 of any of the other fourth leads 7. In other words, the fourth length L4 of the fourth lead 7 sandwiched between two fourth leads 7 located at both ends in the first direction x is shorter than the fourth length L4 of the fourth leads 7 at both ends in the first direction x.

[0047] In the illustrated example, the fourth lengths L4 of the fourth leads 7 located on the outer side in the first direction x are longer than the fourth lengths L4 of the fourth leads 7 located on the center side in the first direction x. In other words, when the fourth lengths L4 of the fourth leads 7 adjacent to each other are compared, the fourth length L4 of the fourth leads 7 located on the outer side in the first direction x is longer than the fourth length L4 of the fourth leads 7 located on the inner side in the first direction x.

[0048] In the illustrated example, the first length L1 and the fourth length L4 of the plurality of first leads 4 and the plurality of fourth leads 7 that are located at the same positions in the first direction x are equal to each other.

[0049] Corner leads 8: As shown in Figures 1 to 9 and 13 to 16, the multiple corner leads 8 are arranged in positions close to the four corners when viewed in the thickness direction z of the sealing resin 2. Two corner leads 8 are arranged on both sides of the multiple first leads 4 in the first direction x. The other two corner leads 8 are arranged on both sides of the multiple fourth leads 7 in the first direction x.

[0050] The corner lead 8 has a thick corner portion 81 , a thin corner portion 82 , a corner mounting surface 83 , a first corner end face 841 , and a second corner end face 842 .

[0051] The thick corner portion 81 is a portion of the corner lead 8 that is relatively thicker in the thickness direction z (compared to the thin corner portion 82). The thick corner portion 81 has a corner mounting surface 83, a first corner end face 841, and a second corner end face 842. The thin corner portion 82 is a portion of the corner lead 8 that is relatively thinner in the thickness direction z (compared to the thick corner portion 81) and is spaced from the resin back surface 22 on the z1 side in the thickness direction z. In this embodiment, the semiconductor element 1 is mounted on the thin corner portion 82. The shape of the thin corner portion 82 as viewed in the thickness direction z is set appropriately depending on, for example, the position where the semiconductor element 1 is mounted.

[0052] The corner mounting surface 83 faces the z2 side in the thickness direction z and is exposed from the resin back surface 22 of the sealing resin 2. In this embodiment, the corner mounting surface 83 has a first portion 831 and a second portion 832. The first portion 831 reaches the first resin side surface 23 or the fourth resin side surface 26 and is spaced apart from the second resin side surface 24 and the third resin side surface 25. The second portion 832 reaches the second resin side surface 24 or the third resin side surface 25 and is spaced apart from the first resin side surface 23 and the fourth resin side surface 26. The first portion 831 and the second portion 832 are connected at their ends. In the illustrated example, the corner mounting surface 83 is L-shaped when viewed in the thickness direction z. In the illustrated example, the length Lc1 of the corner mounting surface 83 in the second direction y is longer than the length Lc2 in the first direction x. However, the shape and size of the corner mounting surface 83 are not limited in any way.

[0053] The first corner end face 841 faces in the second direction y and is exposed from the first resin side face 23 or the fourth resin side face 26. In the example shown, the first corner end face 841 is flush with the first resin side face 23 or the fourth resin side face 26. The second corner end face 842 faces in the first direction x and is exposed from the second resin side face 24 or the third resin side face 25. In the example shown, the second corner end face 842 is flush with the second resin side face 24 or the third resin side face 25.

[0054] 13 , the length Lc1 of the corner mounting surface 83 in the second direction y is greater than the first length L1 of the multiple first leads 4. Furthermore, the length Lc2 of the corner mounting surface 83 in the first direction x is equal to the second length L2 of the multiple second leads 5.

[0055] 13 , the arrangement pitch Pc1 between the first mounting surface 43 and the first portion 831 of the first lead 4 located closest to the x1 side in the first direction x is equal to the arrangement pitch P1 of the first mounting surfaces 43 of the multiple first leads 4. Furthermore, the arrangement pitch Pc2 between the second mounting surface 53 and the second portion 832 of the second lead 5 located closest to the y1 side in the second direction y is equal to the arrangement pitch P2 of the second mounting surfaces 53 of the multiple second leads 5.

[0056] 14 , the length Lc1 of the corner mounting surface 83 in the second direction y is greater than the first length L1 of the multiple first leads 4. In addition, the length Lc2 of the corner mounting surface 83 in the first direction x is equal to the third length L3 of the multiple third leads 6.

[0057] 14 , the arrangement pitch Pc1 between the first mounting surface 43 and the first portion 831 of the first lead 4 located closest to the x2 side in the first direction x is equal to the arrangement pitch P1 of the first mounting surfaces 43 of the multiple first leads 4. Furthermore, the arrangement pitch Pc3 between the third mounting surface 63 and the second portion 832 of the third lead 6 located closest to the y1 side in the second direction y is equal to the arrangement pitch P2 of the third mounting surfaces 63 of the multiple third leads 6.

[0058] 15 , the length Lc1 of the corner mounting surface 83 in the second direction y is greater than the fourth length L4 of the multiple fourth leads 7. Furthermore, the length Lc2 of the corner mounting surface 83 in the first direction x is equal to the second length L2 of the multiple second leads 5.

[0059] 15 , the arrangement pitch Pc4 between the fourth mounting surface 73 and the first portion 831 of the fourth lead 7 located closest to the x1 side in the first direction x is equal to the arrangement pitch P4 of the fourth mounting surfaces 73 of the plurality of fourth leads 7. Furthermore, the arrangement pitch Pc3 between the third mounting surface 63 and the second portion 832 of the third lead 6 located closest to the y2 side in the second direction y is equal to the arrangement pitch P3 of the third mounting surfaces 63 of the plurality of third leads 6.

[0060] 16 , the length Lc1 of the corner mounting surface 83 in the second direction y is greater than the fourth length L4 of the multiple fourth leads 7. In addition, the length Lc2 of the corner mounting surface 83 in the first direction x is equal to the third length L3 of the multiple third leads 6.

[0061] 16 , the arrangement pitch Pc4 between the fourth mounting surface 73 and the first portion 831 of the fourth lead 7 located closest to the x2 side in the first direction x is equal to the arrangement pitch P4 of the fourth mounting surfaces 73 of the multiple fourth leads 7. Furthermore, the arrangement pitch Pc2 between the second mounting surface 53 and the second portion 832 of the second lead 5 located closest to the y2 side in the second direction y is equal to the arrangement pitch P2 of the second mounting surfaces 53 of the multiple second leads 5.

[0062] Center lead 9: As shown in FIGS. 1 to 5, 8, 9, 11, and 12, the center lead 9 is arranged between multiple second leads 5 or multiple third leads 6 in the second direction y. In the example shown, the center lead 9 overlaps the center of the semiconductor device A1 (sealing resin 2) in the second direction y. In the example shown, the center lead 9 has a center thick portion 911, a center thick portion 912, a center thick portion 913, a center thin portion 921, a center thin portion 922, a center mounting surface 931, a center mounting surface 932, a center mounting surface 933, a center end surface 941, and a center end surface 942.

[0063] The center mounting surface 931, the center mounting surface 932, and the center mounting surface 933 are portions of the center lead 9 that are relatively thick in the thickness direction z (compared to the center thin portion 921 and the center thin portion 922). The center thick portion 911 has a center mounting surface 931 and a center end face 941, the center thick portion 912 has a center mounting surface 932 and a center end face 942, and the center thick portion 913 has a center mounting surface 933. The center thick portion 911 is disposed on the x1 side in the first direction x, the center thick portion 912 is disposed on the x2 side in the first direction x, and the center thick portion 913 is disposed in the center in the first direction x.

[0064] The center thin portion 921 and the center thin portion 922 are portions of the center lead 9 that are relatively thin in the thickness direction z (compared to the center thick portion 911, the center thick portion 912, and the center thick portion 913), and are spaced apart on the z1 side in the thickness direction z from the resin back surface 22. In this embodiment, the semiconductor element 1 is mounted on the center thin portion 921 and the center thin portion 922.

[0065] In the illustrated example, the length of the center mounting surface 931 in the first direction x is equal to the second length L2 of the second mounting surface 53 of the second lead 5. Furthermore, the length of the center mounting surface 932 in the first direction x is equal to the third length L3 of the third mounting surface 63 of the third lead 6. The arrangement pitch between the center mounting surface 931 and the second mounting surface 53 adjacent to it in the second direction y is equal to the arrangement pitch P2 of the multiple second mounting surfaces 53. Furthermore, the arrangement pitch between the center mounting surface 932 and the third mounting surface 63 adjacent to it in the second direction y is equal to the arrangement pitch P3 of the multiple third mounting surfaces 63.

[0066] Next, the operation of the semiconductor device A1 will be described.

[0067] When the semiconductor device A1 is mounted on a circuit board or the like, the first mounting surfaces 43 of the leads 4 are conductively joined to the circuit board or the like using a conductive bonding material such as solder. Similarly, the mounting surfaces of the leads 5 to 9 are also conductively joined to the circuit board or the like using a conductive bonding material. When the semiconductor device A1 is used, thermal stress may occur in these conductive bonding materials. The inventor's testing has revealed that, among the conductive bonding materials bonded to the first mounting surfaces 43 of the first leads 4, the conductive bonding materials bonded to the first mounting surfaces 43 located on both sides in the first direction x tend to be most susceptible to thermal stress. Furthermore, it has been revealed that the conductive bonding materials located near the four corners of the sealing resin 2 as viewed in the thickness direction z tend to be most susceptible to thermal stress.

[0068] 5 , with regard to the first length L1, which is the length of the multiple first leads 4 in the second direction y, the first length L1 of the first leads 4 located at both ends in the first direction x among the multiple first leads 4 is longer than the first length L1 of any of the remaining first leads 4. In other words, the first length L1 of the first lead 4 sandwiched between two first leads 4 located at both ends in the first direction x is shorter than the first length L1 of the first leads 4 at both ends in the first direction x. With this configuration, it is possible to prevent excessive stress from being generated in the conductive bonding material bonded to the first mounting surfaces 43 located on both sides in the first direction x.

[0069] In the illustrated example, the first length L1 of the first leads 4 is such that the first length L1 of the first leads 4 located on the outer side in the first direction x is longer than the first length L1 of the first leads 4 located on the center side in the first direction x. In other words, when the first lengths L1 of the first leads 4 adjacent to each other are compared, the first length L1 of the first leads 4 located on the outer side in the first direction x is longer than the first length L1 of the first leads 4 located on the inner side in the first direction x. With this configuration, it is possible to reduce stresses generated in the conductive bonding material bonded to the multiple first mounting surfaces 43 in a balanced manner.

[0070] 5 , with regard to the fourth length L4, which is the length of the multiple fourth leads 7 in the second direction y, the fourth length L4 of the fourth leads 7 located at both ends in the first direction x among the multiple fourth leads 7 is longer than the fourth length L4 of any of the remaining fourth leads 7. In other words, the fourth length L4 of the fourth lead 7 sandwiched between two fourth leads 7 located at both ends in the first direction x is shorter than the fourth length L4 of the fourth leads 7 at both ends in the first direction x. With this configuration, it is possible to prevent excessive stress from being generated in the conductive bonding material bonded to the fourth mounting surfaces 73 located on both sides in the first direction x.

[0071] In the illustrated example, the fourth lengths L4 of the fourth leads 7 located on the outer side in the first direction x are longer than the fourth length L4 of the fourth leads 7 located on the center side in the first direction x. In other words, when the fourth lengths L4 of adjacent fourth leads 7 are compared, the fourth length L4 of the fourth leads 7 located on the outer side in the first direction x is longer than the fourth length L4 of the fourth leads 7 located on the inner side in the first direction x. With this configuration, it is possible to reduce stresses generated in the conductive bonding material bonded to the multiple fourth mounting surfaces 73 in a balanced manner.

[0072] The corner mounting surface 83 also has a first portion 831 and a second portion 832. The first portion 831 reaches the first resin side surface 23 or the fourth resin side surface 26 and is spaced apart from the second resin side surface 24 and the third resin side surface 25. The second portion 832 reaches the second resin side surface 24 or the third resin side surface 25 and is spaced apart from the first resin side surface 23 and the fourth resin side surface 26. The first portion 831 and the second portion 832 are connected at their respective ends. Therefore, the corner mounting surface 83 is configured to be spaced apart from the corner where the first resin side surface 23, the second resin side surface 24, the third resin side surface 25, and the fourth resin side surface 26 are interconnected. This prevents excessive stress from being generated in the conductive bonding material bonded to the corner mounting surface 83.

[0073] 13 , in the corner lead 8, the arrangement pitch Pc1 between the first mounting surface 43 and the first portion 831 of the first lead 4 located closest to the x1 side in the first direction x is equal to the arrangement pitch P1 of the multiple first mounting surfaces 43. This makes it possible to prevent excessive stress from being generated in either the multiple first mounting surfaces 43 or the conductive bonding material bonded to the first portion 831. This effect is also achieved by the relationship between the arrangement pitch Pc1 and the arrangement pitch P1 in FIG. 14 , the relationship between the arrangement pitch Pc4 and the arrangement pitch P4 in FIG. 15 , and the relationship between the arrangement pitch Pc4 and the arrangement pitch P4 in FIG. 16 .

[0074] 13 , in the corner lead 8, the arrangement pitch Pc1 between the first mounting surface 43 and the first portion 831 of the first lead 4 located closest to the x1 side in the first direction x is equal to the arrangement pitch P1 of the multiple first mounting surfaces 43. This makes it possible to prevent excessive stress from being generated in either the multiple first mounting surfaces 43 or the conductive bonding material bonded to the first portion 831. This effect is also achieved by the relationship between the arrangement pitch Pc1 and the arrangement pitch P1 in FIG. 14 , the relationship between the arrangement pitch Pc4 and the arrangement pitch P4 in FIG. 15 , and the relationship between the arrangement pitch Pc4 and the arrangement pitch P4 in FIG. 16 .

[0075] 13 , the arrangement pitch Pc2 between the second mounting surface 53 and the second portion 832 of the second lead 5 located furthest to the y1 side in the second direction y is equal to the arrangement pitch P2 between the second mounting surfaces 53 of the plurality of second leads 5. This makes it possible to prevent excessive stress from being generated in any of the conductive bonding materials bonded to the plurality of second mounting surfaces 53 and the second portions 832. This effect is also achieved by the relationship between the arrangement pitch Pc3 and the arrangement pitch P3 in FIG. 14 , the relationship between the arrangement pitch Pc2 and the arrangement pitch P2 in FIG. 15 , and the relationship between the arrangement pitch Pc3 and the arrangement pitch P3 in FIG. 16 .

[0076] 13 to 16, the width Wc1 of the first portion 831 is equal to the width W1 of the first mounting surface 43 or the width W4 of the fourth mounting surface 73. The width Wc2 of the second portion 832 is equal to the width W2 of the second mounting surface 53 or the width W3 of the third mounting surface 63. This makes it possible to more uniformly distribute stresses generated in the conductive bonding material bonded to these mounting surfaces.

[0077] 17 to 20 show modified examples and other embodiments of the present disclosure. In these figures, elements that are the same as or similar to those in the above-described embodiment are given the same reference numerals. Furthermore, the configurations of the various parts in each modified example and each embodiment can be combined with each other as appropriate within the scope of not causing technical contradictions.

[0078] 17 shows a first modification of the semiconductor device A1. The semiconductor device A11 of this modification differs from the above-described example in the configuration of the plurality of first leads 4 and the plurality of fourth leads 7.

[0079] In this modified example, the first lengths L1 of the first leads 4 are equal to each other except for the first leads 4 located on both sides in the first direction x. The first lengths L1 of the first leads 4 located on both sides in the first direction x are longer than the first lengths L1 of the remaining first leads 4.

[0080] In this modified example, the fourth lengths L4 of the fourth leads 7 other than those located on both sides in the first direction x are equal to one another. The fourth lengths L4 of the fourth leads 7 located on both sides in the first direction x are longer than the fourth lengths L4 of the remaining fourth leads 7.

[0081] This modification also makes it possible to prevent excessive stress from being generated in the conductive bonding material used for mounting. Furthermore, as can be seen from this modification, the configuration in which the first length L1 of the first leads 4 located on both sides of the first direction x among the plurality of first leads 4 is longer than the first length L1 of the remaining first leads 4 can be modified in various ways. Furthermore, the configuration in which the fourth length L4 of the fourth leads 7 located on both sides of the first direction x among the plurality of fourth leads 7 is longer than the fourth length L4 of the remaining fourth leads 7 can be modified in various ways.

[0082] 18 shows a semiconductor device according to a second embodiment of the present disclosure. A semiconductor device A2 according to this embodiment differs from the above-described embodiment in the configuration of the plurality of second leads 5 and the plurality of third leads 6.

[0083] In this embodiment, the second length L2 of the second leads 5 located on both sides of the second leads 5 as viewed in the y direction is longer than the second length L2 of the remaining second leads 5. In other words, the second length L2 of the second lead 5 sandwiched between the two second leads 5 located on both ends in the second direction y is shorter than the second length L2 of the second leads 5 on both ends in the second direction y.

[0084] In the illustrated example, the second lengths L2 of the second leads 5 located on the outer side in the second direction y are longer than the second lengths L2 of the second leads 5 located on the center side in the second direction y. In other words, when the second lengths L2 of the second leads 5 adjacent to each other are compared, the second lengths L2 of the second leads 5 located on the outer side in the second direction y are longer than the second lengths L2 of the second leads 5 located on the inner side in the first direction x.

[0085] This embodiment also makes it possible to prevent excessive stress from being generated in the conductive bonding material used for mounting. Furthermore, in this embodiment, by configuring the second length L2 of the plurality of second leads 5 and the third length L3 of the plurality of third leads 6 as described above, it is possible to more effectively prevent excessive stress from being generated in the conductive bonding material.

[0086] 19 shows a semiconductor device according to a third embodiment of the present disclosure. In a semiconductor device A3 of this embodiment, the lengths of the first resin side surface 23 and the fourth resin side surface 26 in the first direction x are shorter than the lengths of the second resin side surface 24 and the third resin side surface 25 in the second direction y. Furthermore, a center lead 9 is disposed between the multiple first leads 4 and the multiple fourth leads 7 in the first direction x.

[0087] Similar to the above-described embodiment, the first length L1 of the first leads 4 located on both sides in the first direction x is longer than the first length L1 of the remaining first leads 4, and the fourth length L4 of the fourth leads 7 located on both sides in the first direction x is longer than the fourth length L4 of the remaining fourth leads 7. In other words, the semiconductor device A3 can be said to have a configuration in which names, symbols, etc. are redefined in a state in which a configuration similar to that of the semiconductor device A1 is rotated 90 degrees when viewed in the thickness direction z.

[0088] This embodiment also makes it possible to prevent excessive stress from being generated in the conductive bonding material used for mounting. Furthermore, as can be seen from this embodiment, when the sealing resin 2 is rectangular when viewed in the thickness direction z, it is possible to appropriately adopt a configuration in which the lengths of the leads at both ends of either the short side or the long side, or both, are increased.

[0089] 20 shows a semiconductor device according to a fourth embodiment of the present disclosure. A semiconductor device A4 of this embodiment differs from the above-described embodiments in the configuration of the corner leads 8.

[0090] In this embodiment, the corner mounting surface 83 of the corner lead 8 is pentagonal with one corner of the rectangular shape chamfered. The size of the corner mounting surface 83 in the second direction y is smaller than the first length L1 and the fourth length L4, and the size of the corner mounting surface 83 in the first direction x is smaller than the second length L2 and the third length L3.

[0091] In this embodiment, the second mounting surface 53 and the third mounting surface 63 located closest to the y1 side in the second direction y overlap with the first mounting surfaces 43 located on both sides in the first direction x when viewed in the first direction x. Furthermore, the second mounting surface 53 and the third mounting surface 63 located closest to the y2 side in the second direction y overlap with the fourth mounting surfaces 73 located on both sides in the first direction x when viewed in the first direction x.

[0092] This embodiment also prevents excessive stress from being generated in the conductive bonding material used for mounting. Furthermore, as can be seen from this embodiment, the configuration of the corner leads 8 is not limited and can be set appropriately. Furthermore, the semiconductor device of the present disclosure may be configured without the corner leads 8.

[0093] The semiconductor device of the present disclosure is not limited to the above-described first to fourth embodiments and the above-described variations. Figures 21 to 23 show other variations and embodiments of the present disclosure. In these figures, elements that are the same as or similar to those in the above variations and embodiments are given the same reference numerals as those in the above variations and embodiments. Furthermore, the configurations of the various parts in each variation and each embodiment can be combined with each other as appropriate within the scope of not causing technical contradictions.

[0094] 21 shows a second modification of the semiconductor device A1. In the semiconductor device A12 of this modification, the configuration of the corner leads 8 is different from that of the example described above (see FIG. 14).

[0095] In this modification, the length Lc1 and the length Lc2 of the corner mounting surface 83 are equal to each other. In this case, the sealing resin 2 may be, for example, square in shape when viewed in the thickness direction z.

[0096] This modification also makes it possible to prevent excessive stress from being generated in the conductive bonding material used for mounting. Furthermore, as can be seen from this modification, the specific shape of the corner mounting surface 83 is not limited in any way.

[0097] 22 shows a third modification of the semiconductor device A1. The semiconductor device A13 of this modification has a different configuration of the corner leads 8 from the above-described examples.

[0098] In this modification, the corner mounting surface 83 has a first portion 831, a second portion 832, and a third portion 833. The third portion 833 is located between the second portion 832 and the first resin side surface 23 or the fourth resin side surface 26 in the second direction y, and reaches the first portion 831 and the second resin side surface 24 or the third resin side surface 25. The corner mounting surface 83 has the first portion 831, the second portion 832, and the third portion 833, and is therefore F-shaped when viewed in the thickness direction z.

[0099] In the illustrated example, the third portion 833 is located between the second portion 832 and the first resin side surface 23 in the second direction y, and reaches the first portion 831 and the third resin side surface 25. The arrangement pitch between the second portions 832 may be the same as the arrangement pitch P2 or the arrangement pitch P3 in the above-described example. The width of the second portion 832 and the third portion 833 in the second direction y may be the same as the width W2 or the width W3 in the above-described example.

[0100] This modification also makes it possible to prevent excessive stress from being generated in the conductive bonding material used for mounting. Furthermore, as can be seen from this modification, the specific shape of the corner mounting surface 83 is not limited in any way as long as it is a shape that is separated from the four corners of the sealing resin 2.

[0101] 23 shows a semiconductor device according to a fifth embodiment of the present disclosure. A semiconductor device A5 of this embodiment differs from the above-described embodiments in the configuration of the plurality of first leads 4 and the plurality of fourth leads 7.

[0102] In this embodiment, the first lengths L1 of the multiple first leads 4 are all equal. Furthermore, the length Lc1 of the corner lead 8 is longer than the first lengths L1 of the multiple first leads 4. Similarly, the fourth lengths L4 of the multiple fourth leads 7 are all equal. Furthermore, the length Lc1 of the corner lead 8 is longer than the fourth lengths L4 of the multiple fourth leads 7.

[0103] This embodiment also makes it possible to prevent excessive stress from being generated in the conductive bonding material used for mounting. Furthermore, as can be understood from this embodiment, the first length L1 of the plurality of first leads 4, the fourth length L4 of the plurality of fourth leads 7, the second length L2 of the plurality of second leads 5, and the third length L3 of the plurality of third leads 6 may have any length relationship.

[0104] The semiconductor device according to the present disclosure is not limited to the above-described embodiment and modifications. The specific configuration of each part of the semiconductor device according to the present disclosure can be freely modified in various ways. The present disclosure includes the embodiments described in the following appendices.

[0105] Appendix 1A. A semiconductor device comprising: a semiconductor element; a plurality of leads; and a sealing resin covering the semiconductor element and at least a portion of each of the plurality of leads, wherein the sealing resin has a resin back surface facing a thickness direction of the semiconductor element, a first resin side surface along a first direction intersecting the thickness direction, and a second resin side surface and a third resin side surface along a second direction intersecting the thickness direction and the first direction, wherein the plurality of leads include a plurality of first leads arranged in the first direction, wherein each of the plurality of first leads has a first mounting surface exposed from the resin back surface, and the first mounting surface reaches the first resin side surface and is spaced apart from the second resin side surface and the third resin side surface, and wherein a first length that is the length in the second direction of the first mounting surfaces of the plurality of first leads is such that the first length of the plurality of first leads located at both ends in the first direction is longer than the first length of any of the remaining first leads. Appendix 2A. The semiconductor device according to Appendix 1A, wherein the first length of the plurality of first leads is longer for those located on the outer side in the first direction than for those located on the center side in the first direction. Appendix 3A. The semiconductor device according to Appendix 1A or 2A, wherein the sealing resin is rectangular when viewed in the thickness direction. Appendix 4A. The semiconductor device according to any of Appendixes 1A to 3A, wherein the plurality of first leads have first end faces exposed from the first resin side surface. Appendix 5A. The semiconductor device according to any of Appendixes 1A to 4A, wherein the first mounting surface has a shape extending along the second direction. Appendix 6A. The semiconductor device according to any of Appendixes 1A to 5A, wherein the length of the first resin side surface in the first direction is longer than the lengths of the second resin side surface and the third resin side surface in the second direction. Appendix 7A. The semiconductor device according to any of Appendixes 1A to 5A, wherein the length of the first resin side surface in the first direction is shorter than the lengths of the second resin side surface and the third resin side surface in the second direction. Appendix 8A. The semiconductor device according to any one of appendixes 1A to 5A, wherein the length of the first resin side surface in the first direction is equal to the lengths of the second resin side surface and the third resin side surface in the second direction.Appendix 9A. The semiconductor device according to any one of Appendixes 1A to 8A, wherein the first lead includes a first thick portion having the first mounting surface and a first thin portion spaced apart from the resin back surface in the thickness direction. Appendix 10A. The semiconductor device according to any one of Appendixes 1A to 9A, wherein the sealing resin further has a fourth resin side surface facing opposite to the first resin side surface in the second direction, and the leads further include a plurality of second leads arranged in the second direction along the second resin side surface, a plurality of third leads arranged in the second direction along the third resin side surface, and a plurality of fourth leads arranged in the first direction along the fourth resin side surface. Appendix 11A. The semiconductor device according to Appendix 10A, wherein each of the second leads has a second mounting surface exposed from the resin back surface, the second mounting surface reaching the second resin side surface and being spaced apart from the first resin side surface and the fourth resin side surface, each of the third leads has a third mounting surface exposed from the resin back surface, the third mounting surface reaching the third resin side surface and being spaced apart from the first resin side surface and the fourth resin side surface, and each of the fourth leads has a fourth mounting surface exposed from the resin back surface, the fourth mounting surface reaching the fourth resin side surface and being spaced apart from the second resin side surface and the third resin side surface. Appendix 12A. The semiconductor device according to Appendix 11A, wherein a fourth length that is the length in the second direction of the fourth mounting surfaces of the fourth leads is such that the fourth lengths of the fourth leads located at both ends in the first direction among the fourth leads are longer than the fourth lengths of any of the remaining fourth leads. Appendix 13A. The semiconductor device according to any one of Appendixes 11A to 13A, wherein the fourth lengths of the plurality of fourth leads are such that the fourth lengths of the leads located at the outer sides in the first direction are longer than the fourth lengths of the leads located at the center in the first direction. Appendix 14A: The semiconductor device according to any one of Appendixes 11A to 13A, wherein the second lengths of the second mounting surfaces of the plurality of second leads in the first direction and the third lengths of the second mounting surfaces of the plurality of third leads in the first direction are shorter than the first lengths of the plurality of first leads located at both ends in the first direction.Appendix 15A: The semiconductor device according to any one of Appendixes 11A to 13A, wherein the second length, which is the length in the first direction of the second mounting surface of the plurality of second leads, of those second leads located at both ends in the second direction is longer than the second lengths of any of the remaining second leads, and the third length, which is the length in the first direction of the third mounting surface of the plurality of third leads, of those third leads located at both ends in the second direction is longer than the third lengths of any of the remaining third leads. Appendix 16A. the plurality of leads further include corner leads having a corner mounting surface exposed from the resin back surface on an outer side in the first direction relative to the first mounting surfaces of the plurality of first leads, the corner mounting surface having a first portion reaching the first resin side surface and spaced apart from the second resin side surface and the third resin side surface, and a second portion reaching the second resin side surface or the third resin side surface and spaced apart from the first resin side surface and the fourth resin side surface, the first portion and the second portion being connected to each other.

[0106] The present disclosure further includes the embodiments described in the following appendices: Appendix 1B. a semiconductor element; a plurality of leads; and a sealing resin covering the semiconductor element and at least a portion of each of the plurality of leads, wherein the sealing resin has a resin back surface facing a thickness direction of the semiconductor element, a first resin side surface and a fourth resin side surface along a first direction intersecting the thickness direction, and a second resin side surface and a third resin side surface along a second direction intersecting the thickness direction and the first direction, the plurality of leads including a plurality of first leads, a plurality of fourth leads, and a corner lead, the plurality of first leads being arranged in the first direction along the first resin side surface, and the plurality of fourth leads being arranged in the first direction along the fourth resin side surface, each of the plurality of first leads having a first mounting surface exposed from the resin back surface, and each of the plurality of fourth leads having a fourth mounting surface exposed from the resin back surface, and the corner lead having a corner mounting surface exposed from the resin back surface on the outer side in the first direction relative to the first mounting surfaces of the plurality of first leads or the fourth mounting surfaces of the plurality of fourth leads, The corner mounting surface has a first portion that reaches the first resin side surface or the fourth resin side surface and is spaced apart from the second resin side surface and the third resin side surface, and a second portion that reaches the second resin side surface or the third resin side surface and is spaced apart from the first resin side surface and the fourth resin side surface, and the first portion and the second portion are connected. Appendix 2B. The semiconductor device according to Appendix 1B, wherein the sealing resin is rectangular when viewed in the thickness direction. Appendix 3B. The semiconductor device according to Appendix 1B or 2B, wherein the arrangement pitch of the first mounting surfaces of the plurality of first leads is equal to the arrangement pitch of the first mounting surfaces and the first portions of the first leads that are positioned outermost in the first direction among the plurality of first leads. Appendix 4B. The semiconductor device according to any one of Appendixes 1B to 3B, wherein the width in the first direction of the first mounting surfaces of the plurality of first leads is equal to the width in the first direction of the first portions. Appendix 5B. 4D. The semiconductor device according to claim 1B, wherein the length of the corner mounting surface in the second direction is longer than the length of the first mounting surfaces of the first leads in the second direction.Appendix 6B. The semiconductor device according to any one of Appendixes 1B to 5B, wherein the length of the first portion in the second direction is longer than the length of the second portion in the first direction. Appendix 7B. The semiconductor device according to any one of Appendixes 1B to 5B, wherein the length of the first portion in the second direction is shorter than the length of the second portion in the first direction. Appendix 8B. The semiconductor device according to any one of Appendixes 1B to 5B, wherein the length of the first portion in the second direction is equal to the length of the second portion in the first direction. Appendix 9B. The semiconductor device according to any one of Appendixes 1B to 8B, wherein the corner lead has a first corner end face exposed from the first resin side surface and a second corner end face exposed from the second resin side surface or the third resin side surface. Appendix 10B. The semiconductor device according to any one of Appendixes 1B to 9B, wherein the length of the first resin side surface in the first direction is longer than the lengths of the second resin side surface and the third resin side surface in the second direction. Appendix 11B. The semiconductor device according to any one of Supplements 1B to 9B, wherein the length of the first resin side surface in the first direction is shorter than the lengths of the second resin side surface and the third resin side surface in the second direction.Supplementary Note 12B: The semiconductor device according to any one of Supplements 1B to 9B, wherein the length of the first resin side surface in the first direction is equal to the lengths of the second resin side surface and the third resin side surface in the second direction.Supplementary Note 13B: The semiconductor device according to any one of Supplements 1B to 12B, wherein the corner lead includes a thick-walled corner portion having the corner mounting surface and a thin-walled corner portion spaced apart from the resin back surface in the thickness direction.Supplementary Note 14B: The semiconductor device according to any one of Supplements 1B to 13B, wherein the plurality of leads further include a plurality of second leads arranged in the second direction along the second resin side surface, a plurality of third leads arranged in the second direction along the third resin side surface, and a plurality of fourth leads arranged in the first direction along the fourth resin side surface.Appendix 15B. The semiconductor device according to Appendix 14B, wherein each of the second leads has a second mounting surface exposed from the resin back surface, the second mounting surface reaching the second resin side surface and being spaced apart from the first resin side surface and the fourth resin side surface, each of the third leads has a third mounting surface exposed from the resin back surface, the third mounting surface reaching the third resin side surface and being spaced apart from the first resin side surface and the fourth resin side surface, and the fourth mounting surface reaching the fourth resin side surface and being spaced apart from the second resin side surface and the third resin side surface. Appendix 16B. The semiconductor device according to Appendix 15B, wherein the arrangement pitch of the second mounting surfaces of the second leads and the arrangement pitch of the second mounting surfaces and the second portions of the second leads positioned outermost in the second direction among the second leads are equal. Appendix 17B. The semiconductor device according to claim 15B or 16B, wherein the width of the second mounting surface of the second leads in the second direction is equal to the width of the second portion in the second direction.

[0107] A1, A11, A12, A13, A2, A3, A4, A5: semiconductor device 1: semiconductor element 2: sealing resin 4: first lead 5: second lead 6: third lead 7: fourth lead 8: corner lead 9: center lead 21: resin main surface 22: resin back surface 23: first resin side surface 24: second resin side surface 25: third resin side surface 26: fourth resin side surface 41: first thick portion 42: second thin portion 43: first mounting surface 44: first end surface 51: second thick portion 52: second thin portion 53: second mounting surface 54: second end surface 61: third thick portion 62: third thin portion 63: third mounting surface 64: third end surface 71: fourth thick portion 72: fourth thin portion 73: fourth mounting surface 74: Fourth end face 81: Thick corner portion 82: Thin corner portion 83: Corner mounting surface 831: First portion 832: Second portion 833: Third portion 841: First corner end face 842: Second corner end face 911, 912, 913: Thick center portion 921, 922: Thin center portion 931, 932, 933: Center mounting surface 941, 942: Center end face P1, P2, P3, P4, Pc1, Pc2, Pc3, Pc4: Array pitch x: First direction y: Second direction z: Thickness direction

Claims

1. A semiconductor element, a plurality of leads, and a sealing resin that covers at least part of each of the semiconductor element and the plurality of leads, wherein the sealing resin has a resin back surface facing the thickness direction of the semiconductor element, a first resin side surface along a first direction intersecting the thickness direction, and a second resin side surface and a third resin side surface along a second direction intersecting the thickness direction and the first direction, wherein the plurality of leads includes a plurality of first leads arranged in the first direction, each of the plurality of first leads has a first mounting surface exposed from the resin back surface, the first mounting surface reaches the first resin side surface and is separated from the second resin side surface and the third resin side surface, a semiconductor device, wherein a first length, which is a length in the second direction of the first mounting surface of the plurality of first leads, is longer for the first leads located at both ends in the first direction among the plurality of first leads than for any of the other first leads.

2. The semiconductor device according to claim 1, wherein the first length of the plurality of first leads is longer for the first leads located outside in the first direction than for the first leads located on the center side in the first direction.

3. The semiconductor device according to claim 1 or 2, wherein the sealing resin is rectangular when viewed in the thickness direction.

4. The semiconductor device according to claim 1 or 2, wherein the plurality of first leads have first end surfaces exposed from the first resin side surface.

5. The semiconductor device according to claim 1 or 2, wherein the first mounting surface has a shape extending along the second direction.

6. The semiconductor device according to claim 1 or 2, wherein the length of the first resin side surface in the first direction is longer than the lengths of the second resin side surface and the third resin side surface in the second direction.

7. The semiconductor device according to claim 1 or 2, wherein the length of the first resin side surface in the first direction is shorter than the lengths of the second resin side surface and the third resin side surface in the second direction.

8. The semiconductor device according to claim 1 or 2, wherein the length of the first resin side surface in the first direction is equal to the lengths of the second resin side surface and the third resin side surface in the second direction.

9. The semiconductor device according to claim 1 or 2, wherein the first lead includes a first thick portion having the first mounting surface and a first thin portion separated from the resin back surface in the thickness direction.

10. The sealing resin further has a fourth resin side surface facing the side opposite to the first resin side surface in the second direction. The plurality of leads further includes a plurality of second leads arranged in the second direction along the second resin side surface, a plurality of third leads arranged in the second direction along the third resin side surface, and a plurality of fourth leads arranged in the first direction along the fourth resin side surface. The semiconductor device according to claim 1 or 2.

11. Each of the plurality of second leads has a second mounting surface exposed from the resin back surface. The second mounting surface reaches the second resin side surface and is separated from the first resin side surface and the fourth resin side surface. Each of the plurality of third leads has a third mounting surface exposed from the resin back surface. The third mounting surface reaches the third resin side surface and is separated from the first resin side surface and the fourth resin side surface. Each of the plurality of fourth leads has a fourth mounting surface exposed from the resin back surface. The fourth mounting surface reaches the fourth resin side surface and is separated from the second resin side surface and the third resin side surface. The semiconductor device according to claim 10.

12. A fourth length, which is the length in the second direction of the fourth mounting surface of the plurality of fourth leads, is such that the fourth lengths of those located at both ends in the first direction among the plurality of fourth leads are longer than the fourth lengths of any of the remaining fourth leads. The semiconductor device according to claim 11.

13. The fourth lengths of the plurality of fourth leads are such that the fourth lengths of those located outside in the first direction are longer than the fourth length of the one located at the center in the first direction. The semiconductor device according to claim 12.

14. A second length, which is the length in the first direction of the second mounting surface of the plurality of second leads, and a third length, which is the length in the first direction of the second mounting surface of the plurality of third leads, are shorter than the first lengths of those located at both ends in the first direction among the plurality of first leads. The semiconductor device according to claim 11.

15. A second length, which is the length in the first direction of the second mounting surface of the plurality of second leads, is such that the second lengths of those located at both ends in the second direction among the plurality of second leads are longer than the second lengths of any of the remaining second leads. The semiconductor device according to claim 11, wherein a third length, which is the length in the first direction of the third mounting surface of the plurality of third leads, is such that the third length of those of the plurality of third leads located at both ends in the second direction is longer than the third length of any of the remaining third leads.

16. The plurality of leads further includes corner leads having a corner mounting surface that is exposed from the resin back surface outside the first direction with respect to the first mounting surface of the plurality of first leads. The corner mounting surface has a first portion that reaches the first resin side surface and is separated from the second resin side surface and the third resin side surface, and a second portion that reaches the second resin side surface or the third resin side surface and is separated from the first resin side surface and the fourth resin side surface. The semiconductor device according to claim 11, wherein the first portion and the second portion are connected.

17. The semiconductor device according to claim 16, wherein the length in the second direction of the corner mounting surface is longer than the first length of those of the plurality of first leads located at both ends in the first direction.

18. A semiconductor element; A plurality of leads; A sealing resin that covers at least a part of the semiconductor element and the plurality of leads. The sealing resin has a resin back surface facing the thickness direction of the semiconductor element, a first resin side surface and a fourth resin side surface along a first direction intersecting the thickness direction, and a second resin side surface and a third resin side surface along a second direction intersecting the thickness direction and the first direction. The plurality of leads includes a plurality of first leads, a plurality of fourth leads, and corner leads. The plurality of first leads are arranged in the first direction along the first resin side surface. The plurality of fourth leads are arranged in the first direction along the fourth resin side surface. Each of the plurality of first leads has a first mounting surface exposed from the resin back surface. Each of the plurality of fourth leads has a fourth mounting surface exposed from the resin back surface. The corner lead has a corner mounting surface that is exposed from the resin back surface outside the first direction with respect to the first mounting surface of the plurality of first leads or the fourth mounting surface of the plurality of fourth leads. The corner mounting surface has a first portion that reaches the first resin side surface or the fourth resin side surface and is separated from the second resin side surface and the third resin side surface, and a second portion that reaches the second resin side surface or the third resin side surface and is separated from the first resin side surface and the fourth resin side surface. A semiconductor device in which the first portion and the second portion are connected.

19. The semiconductor device according to claim 18, wherein the encapsulating resin is rectangular in the thickness direction.

20. The semiconductor device according to claim 18 or 19, wherein an arrangement pitch of the first mounting surfaces of the plurality of first leads is equal to an arrangement pitch between the first mounting surface of the outermost one of the plurality of first leads in the first direction and the first portion.

21. The semiconductor device according to claim 18 or 19, wherein a width of the first mounting surfaces of the plurality of first leads in the first direction is equal to a width of the first portion in the first direction.

22. The semiconductor device according to claim 18 or 19, wherein a length of the corner mounting surface in the second direction is longer than a length of the first mounting surfaces of the plurality of first leads in the second direction.

23. The semiconductor device according to claim 18 or 19, wherein a length of the first portion in the second direction is longer than a length of the second portion in the first direction.

24. The semiconductor device according to claim 18 or 19, wherein a length of the first portion in the second direction is shorter than a length of the second portion in the first direction.

25. The semiconductor device according to claim 18 or 19, wherein a length of the first portion in the second direction is equal to a length of the second portion in the first direction.

26. The semiconductor device according to claim 18 or 19, wherein the corner lead has a first corner end face exposed from the first resin side surface and a second corner end face exposed from the second resin side surface or the third resin side surface.

27. The semiconductor device according to claim 18 or 19, wherein a length of the first resin side surface in the first direction is longer than lengths of the second resin side surface and the third resin side surface in the second direction.

28. The semiconductor device according to claim 18 or 19, wherein a length of the first resin side surface in the first direction is shorter than lengths of the second resin side surface and the third resin side surface in the second direction.

29. The semiconductor device according to claim 18 or 19, wherein the length of the first resin side surface in the first direction is equal to the length of the second resin side surface and the third resin side surface in the second direction.

30. The semiconductor device according to claim 18 or 19, wherein the corner lead includes a corner thick portion having the corner mounting surface and a corner thin portion spaced apart from the resin back surface in the thickness direction.

31. The semiconductor device according to claim 18 or 19, further comprising a plurality of second leads arranged in the second direction along the second resin side surface, a plurality of third leads arranged in the second direction along the third resin side surface, and a plurality of fourth leads arranged in the first direction along the fourth resin side surface.

32. Each of the plurality of second leads has a second mounting surface exposed from the resin back surface, the second mounting surface reaches the second resin side surface and is spaced apart from the first resin side surface and the fourth resin side surface, each of the plurality of third leads has a third mounting surface exposed from the resin back surface, the third mounting surface reaches the third resin side surface and is spaced apart from the first resin side surface and the fourth resin side surface, The semiconductor device according to claim 31, wherein the fourth mounting surface reaches the fourth resin side surface and is spaced apart from the second resin side surface and the third resin side surface.

33. The semiconductor device according to claim 32, wherein the arrangement pitch of the second mounting surfaces of the plurality of second leads is equal to the arrangement pitch between the second mounting surface of the outermost one of the plurality of second leads in the second direction and the second portion.

34. The semiconductor device according to claim 32, wherein the width of the second mounting surfaces of the plurality of second leads in the second direction is equal to the width of the second portion in the second direction.