PDFN5X6 lead frame

Abstract

The utility model discloses a PDFN5X6 lead frame which comprises a rectangular frame and a subunit, the subunit comprises a metal base island and a pin, a connecting rib is arranged in the rectangular frame, the metal base island is connected with the rectangular frame through the connecting rib, the pin is also connected with the rectangular frame through the connecting rib, and the metal base island is connected with the rectangular frame through the connecting rib. The pins are positioned below the metal base islands; every two subunits form a paired unit, the paired unit comprises a first subunit and a second subunit, the first subunit comprises a first metal base island, the second subunit comprises a second metal base island, the upper side of the first metal base island is connected with the rectangular frame through the connecting rib, and the lower side of the second metal base island is connected with the rectangular frame through the connecting rib. The left side of the lower part of the first metal base island is connected with the rectangular frame through the connecting rib, the upper side of the second metal base island is connected with the rectangular frame through the connecting rib, and the right side of the lower part of the second metal base island is connected with the rectangular frame through the connecting rib; and the lower sides of the pins are connected with the rectangular frame through the connecting ribs. The method has the advantages that the production efficiency of the PDFN5X6 lead frame is improved, and the production cost of the PDFN5X6 lead frame is reduced.

Description

Technical Field

[0001] This application relates to the field of leadframe technology, and in particular to a PDFN5X6 leadframe. Background Technology

[0002] As a chip carrier for integrated circuits, the lead frame is a key structural component that uses bonding materials (gold wire, aluminum wire, copper wire) to achieve electrical connection between the internal circuit leads of the chip and the external leads, forming an electrical circuit. It acts as a bridge connecting to external wires.

[0003] Existing lead frames typically have only one sub-unit within a single package unit. This limits the number of sub-units that can be placed within a lead frame of the same area. In some dual-base island lead frames, the arrangement of the base islands is relatively loose, resulting in lower production efficiency. In addition, the existing methods for limiting the position of sub-units are rather cumbersome, leaving room for optimization and material saving. Utility Model Content

[0004] In view of this, this application provides a PDFN5X6 leadframe, which can optimize the distribution of sub-units within the leadframe, enabling more products to be packaged in the same volume of the leadframe, thereby improving the production efficiency of the leadframe. It also makes the connection between the sub-units and the leadframe simpler, effectively reducing the production cost of the PDFN5X6 leadframe.

[0005] To improve the production efficiency and optimize the production cost of the PDFN5X6 leadframe, this application provides a PDFN5X6 leadframe.

[0006] The PDFN5X6 lead frame provided in this application adopts the following technical solution:

[0007] A PDFN5X6 lead frame includes a rectangular frame and sub-units. Each sub-unit includes a metal base island and a pin. A connecting rib is provided within the rectangular frame. The metal base island is connected to the rectangular frame via the connecting rib, and the pin is also connected to the rectangular frame via the connecting rib, such that the pin is located below the metal base island. Every two sub-units form a pair, each pair including a first sub-unit and a second sub-unit. The first sub-unit includes a first metal base island, and the second sub-unit includes a second metal base island. The upper side of the first metal base island is connected to the rectangular frame via the connecting rib, the lower left side of the first metal base island is connected to the rectangular frame via the connecting rib, the upper side of the second metal base island is connected to the rectangular frame via the connecting rib, and the lower right side of the second metal base island is connected to the rectangular frame via the connecting rib. The lower side of the pin is connected to the rectangular frame via the connecting rib.

[0008] By adopting the above technical solution, the sub-units are connected to the rectangular frame via connecting ribs. The first and second sub-units within the unit are located adjacent to each other within the rectangular frame, allowing for the simultaneous packaging of two products and facilitating the diversification of component functions. The positioning of the connecting ribs between the first sub-unit and the rectangular frame ensures that the first and second sub-units share a smaller area within the rectangular frame. This allows the same volume of rectangular frame to accommodate more sub-units, thereby enabling the same volume of leadframe to package more products and improving leadframe production efficiency. Furthermore, since the pins are connected to the rectangular frame only via connecting ribs on their underside, heat dissipation is better, and materials are saved, contributing to a reduction in leadframe production costs.

[0009] Preferably, every two pairs of units form a group unit, the group unit including a first pair of units and a second pair of units. The first pair of units includes a first metal base island and a second metal base island, and the second pair of units also includes a first metal base island and a second metal base island. An inverted "T"-shaped connecting rib is connected to the rectangular frame. One end of the lower part of the inverted "T"-shaped connecting rib is connected to the second metal base island of the first pair of units, and the other end of the lower part of the inverted "T"-shaped connecting rib is connected to the first metal base island of the second pair of units.

[0010] By adopting the above technical solution, the inverted "T"-shaped connecting ribs allow two pairs of units to occupy a smaller area within the rectangular frame, and the two pairs of units can also share a smaller area within the rectangular frame. This allows a rectangular frame of the same volume to accommodate more sub-units, thereby enabling a lead frame of the same volume to encapsulate more products and improve the production efficiency of the lead frame.

[0011] Preferably, the metal base island includes a central portion and an edge portion, the edge portion is located at the edge of the central portion, and the thickness of the central portion is greater than the thickness of the edge portion.

[0012] By adopting the above technical solution, the heat capacity of the center of the metal base island is increased, which facilitates the heat dissipation of the product.

[0013] Preferably, the central portion is rectangular, and the edge portion includes an upper edge portion, a side edge portion, and a lower edge portion. The upper edge portion has a first protrusion in the middle, and the upper edge portion also has a second protrusion on both sides of the first protrusion for connecting with the connecting rib. The lower part of the side edge portion also has a second protrusion for connecting with the connecting rib.

[0014] By adopting the above technical solution, the second protrusion can be used as an external lead.

[0015] Preferably, except for the first protrusion, all of the metal base islands are provided with a silver-plated film layer; the pins are also provided with a silver-plated film layer.

[0016] By adopting the above technical solutions, the conductivity and low contact resistance of the metal base island are optimized, the thermal and electrical conductivity of the pins are improved, soldering is facilitated, and the pins also have strong corrosion resistance.

[0017] Preferably, the thickness of the silver coating layer is 2-3 micrometers.

[0018] By adopting the above technical solution, the silver plating film layer on the metal base island and pins has stable properties, which also helps to save silver material.

[0019] Preferably, the pin includes a first pin and a second pin, the first pin having a greater length in the lateral direction than the second pin having a greater length in the lateral direction, and both the first pin and the second pin being located below the metal base island.

[0020] By adopting the above technical solution, the first pin and the second pin are evenly distributed below the metal base island.

[0021] Preferably, the rectangular border contains 96 sub-units, and the 96 sub-units are arranged in a 12-row, 8-column matrix structure.

[0022] By adopting the above technical solution, a rectangular frame can encapsulate 96 sub-units.

[0023] Preferably, the rectangular frame has a first groove in the vertical direction, and the first groove is located on the rectangular frame between the group units; the rectangular frame also has a second groove in the horizontal direction, and the second groove is located on the rectangular frame between the pair of units.

[0024] By adopting the above technical solution, the first and second slots can not only save material, but also serve as sprues.

[0025] Preferably, the rectangular frame has positioning holes.

[0026] By adopting the above technical solution, the rectangular frame fits tightly with the mold through the positioning holes, which facilitates production, electroplating, assembly, etc.

[0027] In summary, this application includes at least one of the following beneficial technical effects:

[0028] 1. The sub-units are connected to the rectangular frame via connecting ribs. The first and second sub-units within the unit are located adjacent to each other within the rectangular frame, allowing for the simultaneous packaging of two products and facilitating the diversification of component functions. By positioning the connecting ribs between the first sub-unit and the rectangular frame, the first and second sub-units share a smaller area within the rectangular frame, allowing the same volume of rectangular frame to accommodate more sub-units. This enables the same volume of leadframe to package more products, thereby improving leadframe production efficiency. Furthermore, since the pins are connected to the rectangular frame only via connecting ribs on the underside, heat dissipation is better, and materials are saved, contributing to lower leadframe production costs.

[0029] 2. By using inverted "T" shaped connecting ribs, when the paired units occupy a smaller area within the rectangular frame, the two paired units can also jointly occupy a smaller area within the rectangular frame. This allows the rectangular frame of the same volume to accommodate more sub-units, thereby enabling the lead frame of the same volume to encapsulate more products and thus improve the production efficiency of the lead frame.

[0030] 3. The thickness of the center is greater than that of the edge, which makes the heat capacity of the center of the metal base island greater and facilitates heat dissipation of the product. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the PDFN5X6 lead frame in this embodiment;

[0032] Figure 2 This is a partial structural diagram of the PDFN5X6 lead frame in this embodiment;

[0033] Figure 3 This is a schematic diagram showing the position of the silver plating layer on the PDFN5X6 lead frame in this embodiment;

[0034] Figure 4 For this embodiment Figure 3 The left view;

[0035] Figure 5 For this embodiment Figure 3 Top view.

[0036] Reference numerals: 1. Rectangular frame; 2. Sub-unit; 3. Metal base island; 4. Pin; 5. Connecting rib; 6. Pair of units; 7. First sub-unit; 8. Second sub-unit; 9. First metal base island; 10. Second metal base island; 11. Group unit; 12. First pair of units; 13. Second pair of units; 14. Inverted "T" shaped connecting rib; 15. Center part; 16. Edge part; 17. Upper edge part; 18. Side edge part; 19. Lower edge part; 20. First protrusion; 21. Second protrusion; 22. First pin; 23. Second pin; 24. First strip groove; 25. Second strip groove; 26. Positioning hole; 27. First connecting rib; 28. Second connecting rib; 29. ​​Third connecting rib; 30. Fourth connecting rib; 31. Through hole. Detailed Implementation

[0037] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.

[0038] This application discloses a PDFN5X6 lead frame.

[0039] Reference Figures 1-5 It includes a rectangular frame 1 and sub-units 2. Sub-units 2 include metal base islands 3 and pins 4. The metal base islands 3 and pins 4 are located inside the rectangular frame 1. The rectangular frame 1 has 96 sub-units 2, which are arranged in a 12-row, 8-column matrix structure.

[0040] A through hole 31 is provided in the rectangular frame 1. Two sub-units 2 are located in the through hole 31. The two sub-units 2 form a pair of units 6. The two sub-units 2 in the pair of units 6 are respectively called the first sub-unit 7 and the second sub-unit 8. The first sub-unit 7 includes a first metal base island 9 and a pin 4. The second sub-unit 8 includes a second metal base island 10 and a pin 4.

[0041] The rectangular frame 1 of the first subunit 7 has a connecting rib 5 integrally formed on the inner wall of the through hole 31. The connecting rib 5 includes four first connecting ribs 27, two connecting ribs 28, three connecting ribs 29 and four fourth connecting ribs 30. The four first connecting ribs 27 are evenly distributed on the upper wall of the through hole 31 and are integrally formed with the upper wall of the through hole 31. The second connecting ribs 28 are integrally formed with the left wall of the through hole 31. The third connecting ribs 29 are integrally formed with the right wall of the through hole 31. The four fourth connecting ribs 30 are evenly distributed on the lower wall of the through hole 31 and are integrally formed with the lower wall of the through hole 31.

[0042] The first metal base island 9 is located in the upper left of the through hole 31. The upper side of the first metal base island 9 is integrally formed with two first connecting ribs 27. The two first connecting ribs 27 are symmetrically located on the first metal base island 9. The lower left side of the first metal base island 9 is integrally connected with the second connecting rib 28, so that the first metal base island 9 can be stably located in the through hole 31 on the rectangular frame through the two first connecting ribs 27 and the second connecting rib 28. The second metal base island 10 is located in the upper right of the through hole 31. The upper side of the second metal base island 10 is integrally formed with the remaining two first connecting ribs 27. The two first connecting ribs 27 are symmetrically located on the second metal base island 10. The lower right side of the second metal base island 10 is integrally connected with the third connecting rib 29, so that the second metal base island 10 can be stably located in the through hole 31 on the rectangular frame through the two first connecting ribs 27 and the third connecting rib 29.

[0043] The first sub-unit 7 and the second sub-unit 8 in unit 6 are located adjacent to each other within the rectangular frame 1, allowing two products to be packaged simultaneously, facilitating the diversification of component functions. By positioning the connecting rib 5 between the first sub-unit 7 and the rectangular frame 1, the first sub-unit 7 and the second sub-unit 8 together occupy a smaller area within the rectangular frame 1. This allows the rectangular frame 1 of the same volume to accommodate more sub-units 2, thereby enabling the lead frame of the same volume to package more products and improving the production efficiency of the lead frame.

[0044] Pin 4 includes a first pin 22 and a second pin 23. The length of the first pin 22 in the lateral direction is greater than the length of the second pin 23 in the lateral direction. The first pin 22 and the second pin 23 on the first sub-unit 7 are integrally formed with the two fourth connecting ribs 30, so that the pin 4 of the first sub-unit 7 is located below the first metal base island 9. The first pin 22 and the second pin 23 of the second sub-unit 8 are integrally formed with the remaining two fourth connecting ribs 30, so that the first pin 22 and the second pin 23 of the second sub-unit 8 are located below the second metal base island 10.

[0045] The end of pin 4 near the fourth connecting rib 30 has an arc bend, so that the horizontal plane of pin 4 on the lead frame is lower than the horizontal plane of metal base island 3 on the lead frame. That is, when the user places the lead frame flat on the table, even if pin 4 can touch the table, metal base island 3 will not touch the table.

[0046] The metal base island 3 includes a central portion 15 and an edge portion 16. The edge portion 16 is arranged around the central portion 15. The central portion 15 and the edge portion 16 are integrally formed. The central portion 15 is rectangular. The edge portion 16 includes an upper edge portion 17, a side edge portion 18, and a lower edge portion 19. A first protrusion 20 is integrally formed in the middle of the upper side of the upper edge portion 17. A second protrusion 21 is integrally formed near the first connecting rib 27 of the upper edge portion 17. The second protrusion 21 of the upper edge portion 17 is symmetrically located on both sides of the first protrusion 20. A second protrusion 21 is also integrally formed near the second connecting rib 28 or the third connecting rib 29 of the side edge portion 18. The lower edge portion 19 is rectangular. The thickness of the metal base island 3 in the central portion 15 is greater than the thickness of the metal base island 3 in the edge portion 16, which makes the heat capacity of the central portion 15 of the metal base island 3 larger and facilitates the heat dissipation of the product. Since the second protrusion 21 is near the connecting rib 5, the second protrusion 21 can be used as an external lead.

[0047] The rectangular frame has a first groove 24 in the vertical direction, which is located at the axis of symmetry of the rectangular frame. The first groove 24 also symmetrically divides the four pairs of units 6. The rectangular frame also has a second groove 25 in the direction perpendicular to the vertical direction, which is located between the pairs of units 6. The first groove 24 and the second groove can not only save material, but also serve as a sprue. The edges at both ends of the rectangular frame 1 also have positioning holes 26. The rectangular frame 1 fits tightly with the mold through the positioning holes 26, which facilitates production, electroplating, assembly, etc.

[0048] Furthermore, in this embodiment, in addition to the first protrusion 20 on the edge portion 16, both the metal base island 3 and the pin 4 are electroplated with a silver film layer. The thickness of the silver film layer is 2.54 micrometers. The silver film layer can optimize the conductivity and low contact resistance performance of the metal base island 3, improve the thermal conductivity and electrical conductivity of the pin 4, facilitate soldering, and also make the pin 4 have strong corrosion resistance. The 2.54-micrometer silver film layer has stable properties and is also conducive to saving silver material.

[0049] Furthermore, in this embodiment, in addition to the first protrusion 20 on the edge portion 16, the metal base island 3 and the pin 4 are electroplated with a silver film layer, which can be 2 micrometers to 3 micrometers.

[0050] Furthermore, in this embodiment, two pairs of units 6 can form a group unit 11, which includes a first pair of units 12 and a second pair of units 13. The first pair of units 12 includes a first metal base island 9 and a second metal base island 10, and the second pair of units 13 also includes a first metal base island 9 and a second metal base island 10. A through hole 31 is provided on the rectangular frame 1, and the group unit 11 is located in the through hole 31. An inverted "T"-shaped connecting rib 14 is integrally formed in the middle of the upper wall of the through hole 31, and eight first connecting ribs 27 are also integrally formed on the upper wall of the through hole 31. The eight first connecting ribs 27 are symmetrical about the inverted "T"-shaped connecting rib 14 as the axis of symmetry. The left wall of the through hole 31 is integrally formed with a second connecting rib 28, and the right wall of the through hole 31 is integrally formed with a third connecting rib 29. The lower wall of the through hole 31 is symmetrically distributed with eight fourth connecting ribs 30 about the axis of symmetry of the "T"-shaped connecting rib 5. The first metal base island 9, the second metal base island 10 of the first pair of units 12, and the first metal base island 9 and the second metal base island 10 of the second pair of units 13 are distributed sequentially from left to right within the through hole 31, such that the first pair of units 12 and the second pair of units 13 are symmetrical about the inverted "T"-shaped connecting rib 14, and the upper side of the first metal base island 9 of the first pair of units 12 is aligned with the two first connecting ribs 27. The first pair of units 12 has its lower left side of the first metal base island 9 connected to the second connecting rib 28; the upper side of the second metal base island 10 of the first pair of units 12 is connected to two first connecting ribs 27, and the lower right side of the second metal base island 10 of the first pair of units 12 is integrally formed with the left end of the inverted "T" shaped connecting rib 14; the upper side of the first metal base island 9 of the second pair of units 13 is connected to two first connecting ribs 27, and the lower left side of the first metal base island 9 of the second pair of units 13 is integrally formed with the right end of the inverted "T" shaped connecting rib 14; the upper side of the second metal base island 10 of the second pair of units 13 is connected to the remaining two first connecting ribs 27. Next, the lower right end of the second metal base island 10 of the second pair of units 13 is integrally connected to the third connecting rib 29. The pins 4 of the first pair of units 12 and the second pair of units 13 are symmetrically connected to the fourth connecting rib 30 with the inverted "T" shaped connecting rib 14 as the axis of symmetry. The inverted "T" shaped connecting rib 14 allows the two pairs of units 6 to occupy the area within the smaller rectangular frame 1, while the two pairs of units 6 can also jointly occupy the area within the smaller rectangular frame 1. This allows the rectangular frame 1 of the same volume to accommodate more sub-units 2, thereby enabling the lead frame of the same volume to package more products and improve the production efficiency of the lead frame.

[0051] Furthermore, in this embodiment, the present invention does not impose any particular limitation on the number of sub-units 2 on the rectangular border 1. Any method known to those skilled in the art that enables the sub-units 2 to be distributed in a matrix manner in multiples of four can be used. Those skilled in the art can select and adjust the number of sub-units 2 according to specific application conditions, product requirements, etc.

[0052] It should be noted that the various embodiments of this application can be arbitrarily combined into new embodiments, provided that the solutions do not conflict and the technical solutions can coexist.

[0053] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A PDFN5X6 lead frame, characterized in that: It includes a rectangular frame (1) and a sub-unit (2). The sub-unit (2) includes a metal base island (3) and a pin (4). The rectangular frame (1) is provided with a connecting rib (5). The metal base island (3) is connected to the rectangular frame (1) through the connecting rib (5). The pin (4) is also connected to the rectangular frame (1) through the connecting rib (5), and the pin (4) is located below the metal base island (3). Every two sub-units (2) form a pair of units (6), each pair of units (6) including a first sub-unit (7) and a second sub-unit (8). The first sub-unit (7) includes a first metal base island (9), and the second sub-unit (8) includes a second metal base island (10). The upper side of the first metal base island (9) is connected to the rectangular frame (1) through the connecting rib (5). The lower left side of the first metal base island (9) is connected to the rectangular frame (1) through the connecting rib (5). The upper side of the second metal base island (10) is connected to the rectangular frame (1) through the connecting rib (5). The lower right side of the second metal base island (10) is connected to the rectangular frame (1) through the connecting rib (5). The lower side of the pin (4) is connected to the rectangular frame (1) through the connecting rib (5).

2. The PDFN5X6 lead frame according to claim 1, characterized in that: Every two pairs of units (6) form a group unit (11), which includes a first pair of units (12) and a second pair of units (13). The first pair of units (12) includes a first metal base island (9) and a second metal base island (10). The second pair of units (13) also includes a first metal base island (9) and a second metal base island (10). An inverted "T"-shaped connecting rib (14) is connected to the rectangular frame (1). One end of the lower part of the inverted "T"-shaped connecting rib (14) is connected to the second metal base island (10) of the first pair of units (12), and the other end of the lower part of the inverted "T"-shaped connecting rib (14) is connected to the first metal base island (9) of the second pair of units (13).

3. The PDFN5X6 lead frame according to claim 1, characterized in that: The metal base island (3) includes a central portion (15) and an edge portion (16), the edge portion (16) being located around the central portion (15), and the thickness of the central portion (15) being greater than the thickness of the edge portion (16).

4. The PDFN5X6 lead frame according to claim 3, characterized in that: The central part (15) is rectangular, and the edge part (16) includes an upper edge part (17), a side edge part (18) and a lower edge part (19). The upper edge part (17) has a first protrusion (20) in the middle. The upper edge part (17) also has a second protrusion (21) on both sides of the first protrusion (20) for connecting with the connecting rib (5). The lower part of the side edge part (18) also has a second protrusion (21) for connecting with the connecting rib (5).

5. The PDFN5X6 lead frame according to claim 4, characterized in that: Except for the first protrusion (20), the metal base island (3) is provided with a silver-plated film layer; the pin (4) is also provided with a silver-plated film layer.

6. The PDFN5X6 lead frame according to claim 5, characterized in that: The thickness of the silver coating is 2-3 micrometers.

7. The PDFN5X6 lead frame according to claim 1, characterized in that: The pin (4) includes a first pin (22) and a second pin (23). The first pin (22) is longer in the lateral direction than the second pin (23), and both the first pin (22) and the second pin (23) are located below the metal base island (3).

8. The PDFN5X6 lead frame according to claim 1, characterized in that: The rectangular border (1) contains 96 sub-units (2), and the 96 sub-units (2) are arranged in a 12-row, 8-column matrix structure.

9. The PDFN5X6 lead frame according to claim 2, characterized in that: The rectangular frame (1) has a first strip groove (24) in the vertical direction, and the first strip groove (24) is located on the rectangular frame (1) between the group units (11); the rectangular frame (1) also has a second strip groove (25) perpendicular to the vertical direction, and the second strip groove (25) is located on the rectangular frame (1) between the pair units (6).

10. The PDFN5X6 lead frame according to claim 1, characterized in that: The rectangular frame (1) has a positioning hole (26).

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