TO263 double-row lead frame

Abstract

The utility model provides a TO263 double-row lead frame, and relates to the field of semiconductor packaging. The lead frame is formed by transversely and continuously arranging a plurality of frame units, and each frame unit comprises four lead frame bodies which are arranged in upper and lower double rows and left and right double columns; the lead frame body comprises a base island, a frame and two pins; in the frame unit, the lead frame bodies arranged in an upper row and a lower row are adjacently arranged through the base islands, and the base islands are connected through the connecting ribs. An injection molding runner is arranged between the lead frame bodies which are arranged in left and right rows, and frames of the lead frame bodies are mutually connected in the transverse direction; in the lead frame body, the end portion, far away from the connecting rib, of the base island is connected with two pins, and the two pins and the frame are integrally formed. According to the invention, the material cost can be reduced, the copper utilization rate of the frame is improved, the problems of deformation of an injection molding opening at the head of a product, wire punching and the like can be effectively solved, and the reliability and qualified rate of the product are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of semiconductor packaging, and particularly to a TO263 double-row lead frame. BACKGROUND

[0002] In the integrated circuit packaging process, the lead frame as the chip carrier of the integrated circuit is a key structural member for realizing the electrical connection between the internal circuit lead-out end of the chip and the external lead by means of bonding material, forming an electrical circuit, and playing a role of bridge connecting the external wire. The plastic package lead frame is needed in most semiconductor integrated blocks, which directly affects the efficiency and reliability of IC product packaging, and the structure of the lead frame is the key to affecting the efficiency and reliability.

[0003] For a long time, due to the product structure, the TO263 product packaging manufacturing has been restricted by the lead frame mode developed in the early stage.

[0004] In the prior art, the design of the TO263 lead frame has a single-row lead frame and an IDF type frame structure. Among them, the single-row lead frame has long pins and uses more material for the frame, resulting in high material cost, poor flowability of glue injection, and problems such as easy deformation and punching. The IDF type frame structure is a foot-to-fork structure (which can be understood as, in the two double-row lead frames opposite to each other, the base island is far away from the setting, and the pin is close to the setting to form a foot-to-fork structure). Although the total width of this structure is narrower and the material is reduced compared to the traditional single-row structure, the distance between the feet is reduced after the foot-to-fork structure. When the frame is punched, a part of the thick material on the outside needs to be punched off, resulting in an increase in material cost. At the same time, corresponding to the foot-to-fork structure, the die blade needs to be thinned, and the blade is prone to breakage, so a better material blade needs to be used, and the blade also needs to be frequently replaced, thereby reducing the efficiency during punching, resulting in an increase in the cost of the frame. And the IDF type frame structure can only enter from the head (base island) during plastic packaging, the injection path is long, and the head injection port is prone to deformation, punching and other problems, and the quality control requirement is high. Utility model content

[0005] The utility model aims at providing a TO263 double-row lead frame, which can reduce the material cost, improve the utilization rate of copper in the frame, effectively solve the problems of deformation of the product head injection port and punching, and improve the reliability and qualification rate of the product.

[0006] To solve the above technical problems, the utility model adopts the technical scheme of:

[0007] A TO263 double-row lead frame is formed by horizontally and continuously arranging a plurality of frame units, each of which includes four lead frame bodies arranged in an upper and lower double row and a left and right double column.

[0008] The lead frame body comprises a base island, a frame and two pins;

[0009] In the frame unit, the lead frame bodies arranged in two rows in up and down direction are adjacently arranged by the base island and connected by the connecting ribs; the lead frame bodies arranged in two rows in left and right direction are provided with injection flow channels and the frames are connected in transverse direction;

[0010] In the lead frame body, the base island connects the two pins away from the end of the connecting rib, and the two pins are integrally formed with the frame.

[0011] Further, in the utility model, the frames of the lead frame bodies arranged in two rows in left and right direction are connected in transverse direction to form a glue punching area, and the glue punching area is located on the same line with the injection flow channel;

[0012] The glue punching area is provided with a glue punching hole.

[0013] Further, in the utility model, the frames of the lead frame bodies arranged in two rows in left and right direction are integrally formed in transverse direction.

[0014] Further, in the utility model, the length of the pin is less than 5.75mm.

[0015] Further, in the utility model, the pin satisfies at least one of the following conditions:

[0016] The total length of the pin is 2.98mm;

[0017] The exposed length of the pin is 2.13mm;

[0018] The width of the pin is 0.32mm.

[0019] Further, in the utility model, the first narrow part is connected between the two connecting ribs in the frame unit, and the second narrow part is connected between the connecting ribs of the two frame units, and the transverse length of the second narrow part is less than the transverse length of the first narrow part.

[0020] Further, in the utility model, the first narrow part and the second narrow part are structures that the end of the connecting rib is convex in transverse direction and is narrowed in longitudinal direction.

[0021] Further, in the utility model, the connecting rib is provided with a through hole.

[0022] Further, two opposite frames of the double-row are an upper frame and a lower frame, the upper frame is provided with a first positioning hole away from the edge of the base island, and the connecting part between the frames of the adjacent frame units is provided with a second positioning hole.

[0023] Further, in the utility model, the lead frame is arranged with ten frame units in transverse direction.

[0024] The utility model has at least the following advantages or beneficial effects:

[0025] The utility model discloses a TO263 double-row lead frame, which comprises a plurality of frame units arranged in transverse direction, and each frame unit is arranged with four lead frame bodies in double-row and double-column, forming a double-row lead frame, the two base islands of the two lead frame bodies arranged in double-row in each frame unit are arranged adjacently and are connected through the connecting rib, forming a double-row lead frame with head-to-head structure, so that the deformation of the head during injection molding can be avoided, and the problem of wire punching can be solved, and the material can be saved. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical scheme of the embodiments of the utility model, the following will briefly introduce the drawings needed to be used in the embodiments, and it should be understood that the following drawings only show some embodiments of the utility model, and should not be regarded as the limitation to the scope, and for the ordinary skilled in the art, other related drawings can be obtained without the creative labor on the premise of the drawings.

[0027] Figure 1 The overall structure schematic diagram of the TO263 double-row lead frame provided for the application embodiment is shown in the figure.

[0028] Figure 2 The partial structure enlarged schematic diagram of the TO263 double-row lead frame provided for the application embodiment is shown in the figure.

[0029] Figure 3 The side view of the TO263 double-row lead frame provided for the application embodiment is shown in the figure.

[0030] Figure 4 For the purpose of the application embodiment Figure 3 The structure of A in the middle is enlarged and shown schematically.

[0031] Icon: 10 - frame unit, 11 - lead frame body, 111 - base island, 112 - frame, 1121 - upper frame, 1122 - lower frame, 1123 - first positioning hole, 1124 - second positioning hole, 113 - pin, 114 - dovetail groove, 12 - injection flow channel, 13 - connecting rib, 131 - first narrowing part, 132 - second narrowing part, 133 - through hole, 14 - glue punching area, 141 - glue punching hole. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme of the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0033] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor are within the scope of protection of the present application. EMBODIMENT

[0034] Please refer to Figures 1-4 , which is a structural schematic diagram of a TO263 double-row lead frame in the embodiments of the present application;

[0035] The embodiments provide a TO263 double-row lead frame, which is formed by a plurality of frame units 10 arranged transversely in series, each frame unit 10 comprising four lead frame bodies 11 arranged in double rows up and down and double columns left and right;

[0036] The lead frame body 11 comprises a base island 111, a frame 112 and two pins 113;

[0037] In the frame unit 10, the lead frame bodies 11 arranged in double rows up and down are arranged adjacent to each other through the base islands 111 and connected between the base islands 111 through the connecting ribs 13; the lead frame bodies 11 arranged in double columns left and right are provided with injection flow channels 12 and their frames 112 are connected to each other in the transverse direction;

[0038] In the lead frame body 11, the base island 111 connects two pins 113 away from the end of the connecting rib 13; the two pins 113 are integrally formed with the frame 112.

[0039] In the following, a TO263 double-row lead frame according to the present exemplary embodiment will be further described.

[0040] In some embodiments of the present application, with reference to Figure 1 and Figure 2 The above-mentioned frame unit 10 includes four lead frame bodies 11 arranged in an upper and lower double row and a left and right double column, and a plurality of frame units 10 are arranged in a horizontal continuous row to form a double-row lead frame. The double-row lead frame can effectively improve the work efficiency of mounting and soldering compared with the traditional single-row lead frame structure.

[0041] By arranging four lead frame bodies 11 as one frame unit 10, each of which includes a base island 111, a frame 112, and two pins 113, in each frame unit, two lead frame bodies 11 arranged in an upper and lower double row are arranged adjacent to each other through the base island 111, and the adjacent two base islands 111 are connected by the connecting rib 13, that is, the two lead frame bodies 11 opposite to each other in the double row are arranged in a head-to-head structure (the base island 111 is adjacent to and opposite to the base island 111), so that the pins 113 are located outside the head, which is suitable for injection molding from the foot part. It can avoid the problem of deformation of the injection port, overflow of glue, and the like caused by the injection of the lead frame with the traditional foot-to-fork double-row structure from the head part. By connecting the two base islands 111 adjacent in the longitudinal direction through the connecting rib 13, it is convenient to cut off the lead frame bodies 11 arranged in an upper and lower double row later.

[0042] It should be noted that the above-mentioned overflow refers to the state of injection during packaging forming. Since the injection glue is in a molten state and has a certain melting viscosity and flow speed, it naturally has a certain impact force. This impact force acts on the gold wire, which can easily cause the gold wire to deviate, and in severe cases, it can cause the gold wire to be broken. When the injection is from the foot part, the molten injection glue will not directly impact the gold wire, thereby avoiding the breakage of the gold wire, and effectively solving the overflow problem.

[0043] In some embodiments of the present application, in each frame unit 10, the lead frame bodies 11 arranged in a left and right double column are provided with an injection flow channel 12, and the frames 112 thereof are connected to each other in the horizontal direction, so that the four lead frame bodies 11 constituting the frame unit 10 share one injection flow channel, and injection molding can be performed simultaneously. One injection molding material cake can be used to injection mold two adjacent frame units 10, i.e. eight lead frame bodies 11, and sixteen lead frame bodies 11 can be injection molded on both sides, which greatly improves the injection molding efficiency.

[0044] In some embodiments of the present application, in the lead frame body 11, the base island 111 connects two pins 113 away from the end of the connecting rib 13, and the pins 113 are integrally formed with the frame 112. The conventional TO263 single-row lead frame has three pins, and the present application is provided with two pins 113, and the PIN2 pin is cancelled, which can reduce the material usage.

[0045] As a preferred embodiment, the frames 112 of the lead frame body 11 arranged in left and right double columns are connected to each other in the transverse direction to form a punching area 14, and the punching area 14 is located on the same straight line as the injection flow channel 12, so that the plastic sealing material can quickly flow into the injection flow channel 12. During injection molding, the injection port of the injection mold is placed at the punching area 14, and the plastic sealing material is released into the injection flow channel 12 through the injection port, so that the four lead frame bodies 11 of one frame unit 10 can be simultaneously injection molded. The punching port 141 is provided on the punching area 14, which can be used as a punching hole. After the lead frame is plastic sealed, the injection port can be quickly punched out from the punching hole to avoid its remaining on the lead frame. The punching port 141 can also be used as a position for collecting the plastic sealing material flowing fastest during the injection molding process, so that the plastic sealing material with poor fluidity can be discharged from the hole, thereby making the flow rate of the plastic sealing material entering the injection flow channel 12 more uniform, which is beneficial to the subsequent gel filling. The punching port 141 can also be used as a cutting position of the left and right adjacent frames, and the adjacent lead frame bodies 11 can be quickly cut after the plastic sealing is completed.

[0046] As a preferred embodiment, the frames 112 of the lead frame body 11 arranged in left and right double columns are integrally formed in the transverse direction, and the integrally formed frame 112 is smooth at the punching port 141, which avoids affecting the fluidity of the plastic sealing material at this position.

[0047] As a preferred embodiment, the total length of the pin 113 is less than 5.75 mm. The size 5.75 is the length of the pin of the conventional single-row lead frame. By shortening the length of the pin 113, the longitudinal length of the frame 112 can be reduced, thereby reducing the material usage, and the glue injection channel can be shortened, so that the glue injection is short and the glue flowability is good, which further solves the product punching problem.

[0048] As a preferred embodiment, the total length of the pin 113 is preferably 2.98 mm, which is reduced by 2.77 mm compared with the total length 5.75 mm of the conventional single row; the exposed length of the pin 113 is preferably 2.13 mm, which is reduced by 2.4 mm compared with the exposed length 4.53 of the conventional single row; and the width of the pin 113 is preferably 0.32 mm. Compared with the single-row lead frame, the length of the pin 113 of the double-row head-to-head lead frame of the present application is shortened by about half, which greatly reduces the material cost and makes the structure more compact.

[0049] As a preferred embodiment, the length of the connecting rib 13 in the longitudinal direction is preferably 1.52 mm; the length of the base island 111 in the longitudinal direction is preferably 2.72 mm. By setting the length of the base island 111 in the longitudinal direction to 2.72 mm, which is 0.04 mm less than the length of the base island in the longitudinal direction in a single-row base island, and setting the length of the connecting rib 13 in the longitudinal direction to 1.52 mm, which is matched with the length of the base island 111 in the longitudinal direction, the compactness of the lead frame in the longitudinal direction is further improved.

[0050] As a preferred embodiment, the two adjacent connecting ribs 13 in the frame unit 10 are connected by the first narrowing portion 131, and the connecting ribs 13 between the two adjacent frame units 10 are connected by the second narrowing portion 132, so that the adjacent connecting ribs 13 are connected as a whole, which can improve the structural strength of the lead frame and further improve the injection stability. The transverse length of the second narrowing portion 132 is less than the transverse length of the first narrowing portion 131. Since the injection flow channel is shared in one frame unit 10, and there is no injection flow channel between the two adjacent frame units 10, the distance between the two adjacent frame units 10 (the transverse length of the second narrowing portion) is set to be less than the distance between the two adjacent lead frame bodies 11 in one frame unit 10 (the transverse length of the first narrowing portion), which can further improve the compactness.

[0051] As a preferred embodiment, the first narrowing portion 131 and the second narrowing portion 132 are structures protruding in the transverse direction and narrowing in the longitudinal direction at the end of the connecting rib 13, and the length of the first narrowing portion 131 and the second narrowing portion 132 in the longitudinal direction is preferably 1.2 mm; the length of the first narrowing portion 131 in the transverse direction is preferably 3.12 mm; and the length of the second narrowing portion 132 in the transverse direction is preferably 1.52 mm. By limiting the above dimensions, the first narrowing portion 131 and the second narrowing portion 132 are both set to be short and narrow, so that the adjacent connecting ribs 13 are easy to cut and not easy to have cutting residues after cutting.

[0052] As a preferred embodiment, the connecting rib 13 is provided with a through hole 133, which is a strip-shaped hole in the transverse direction of the lead frame, which is easy to cut the connecting rib 13 later, and further separates the two lead frame bodies 11 in the double row.

[0053] As a preferred embodiment, with reference to Figure 2The two opposite edges of the double row are respectively an upper edge 1121 and a lower edge 1122, the first positioning hole 1123 is arranged at the edge of the upper edge 1121 away from the base island 111; and the second positioning hole 1124 is arranged at the connecting part between the edges of the adjacent frame units 10. The positioning hole is arranged for subsequent process positioning, which can improve the convenience and efficiency of subsequent process positioning. In order to improve the compactness of the structure, the first positioning hole 1123 is arranged at the edge of one of the edges 112, that is, the upper edge 1121, and the first positioning hole 1123 is arranged with one or two, at least one of which is arranged on the center line of the lead frame body 11, and the other is arranged at a position opposite to one of the pins 113, which can further improve the positioning accuracy and meet the positioning requirements of each process of the product; the second positioning hole 1124 is arranged at the edge of the adjacent frame unit 10, which can facilitate cutting between the adjacent lead frame bodies 11 in addition to the positioning function.

[0054] As a preferred embodiment, referring to Figure 1 The lead frame has ten frame units 10 arranged in a row in the transverse direction. Through the frame structure design of the present application, one lead frame can be arranged with ten frame units 10 in the transverse direction, and forty lead frame bodies 11 in the double row, which greatly improves the production capacity compared with the traditional lead frame.

[0055] As a preferred embodiment, referring to Figure 3 and Figure 4 The bottom of the connecting part between the two opposite base islands 111 and the connecting rib 13 is provided with a dovetail groove 114, which can be used for locking glue to prevent the base island 111 from separating from the plastic sealing glue after packaging.

[0056] The embodiment of the present application has the following beneficial effects:

[0057] Compared with the traditional TO263 single-row lead frame and the foot-to-fork lead frame, the TO263 double-row lead frame structure of the present application effectively solves the problems of product punching, injection molding port deformation and the like, improves the reliability and pass rate of the product, optimizes the design of the frame edge 112, meets the positioning requirements of each process of the TO263 product, saves materials, and the frame can be saved by 20%, the plastic sealing material can be saved by 10%, and the copper utilization rate of the frame is improved. And due to the optimization of the frame layout design, the number of product units can be made to be forty in the double row, and several times the number of TO263 chips can be operated at the same time, which greatly increases the production capacity.

[0058] The above merely is preferred embodiment of the present utility model, and is not for limiting the present utility model, for the person skilled in the art, the present utility model can have various changes and changes. Any modification, equivalent replacement, improvement etc. that is made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims

1. A TO263 dual-in-line leadframe, characterized by, A plurality of frame units are arranged in series in the lateral direction, each of the frame units comprising four lead frame bodies arranged in two rows in the vertical direction and two columns in the lateral direction; The lead frame body comprises a base island, a frame and two pins; In the frame unit, the lead frame bodies arranged in two rows in the vertical direction are adjacent to each other via the base islands and connected via connecting ribs; the lead frame bodies arranged in two columns in the lateral direction are provided with injection flow channels and the frames thereof are connected to each other in the lateral direction; In the lead frame body, the base island connects the two pins at the end away from the connecting rib, and the two pins are integrally formed with the frame.

2. The TO263 double-row lead frame according to claim 1, wherein The frames of the lead frame bodies arranged in two columns in the lateral direction are connected to each other in the lateral direction to form a pad area, and the pad area is located on the same line as the injection flow channel; The pad area is provided with a pad opening.

3. The TO263 dual-in-line leadframe of claim 1 or 2, wherein, The frames of the lead frame bodies arranged in two columns in the lateral direction are integrally formed in the lateral direction.

4. The TO263 double-row lead frame according to claim 1, wherein The length of the pin is less than 5.75 mm.

5. The TO263 dual-in-line lead frame of claim 1 or 4, wherein, The pin satisfies at least one of the following conditions: The total length of the pin is 2.98 mm; The exposed length of the pin is 2.13 mm; The width of the pin is 0.32 mm.

6. The TO263 dual-in-line leadframe of claim 1, wherein, The first narrow part is connected between two adjacent connecting ribs in the frame unit, and the second narrow part is connected between the connecting ribs of two adjacent frame units, and the lateral length of the second narrow part is less than that of the first narrow part.

7. The TO263 dual-in-line leadframe of claim 6, wherein, The first narrow part and the second narrow part are structures in which the end of the connecting rib is raised in the lateral direction and narrowed in the longitudinal direction.

8. The TO263 dual-in-line lead frame of claim 1 or 6, wherein, The connecting rib is provided with a through hole.

9. The TO263 dual-in-line leadframe of claim 1, wherein, The two opposite frames of the double row are respectively an upper frame and a lower frame, and the upper frame is provided with a first positioning hole at the edge away from the base island; the connecting part between the frames of adjacent frame units is provided with a second positioning hole.

10. The TO263 dual-in-line leadframe of claim 1, wherein, The lead frame is provided with ten frame units arranged in series in the lateral direction.

Images