CN212848388U

CN212848388U - Multirow lead frame suitable for DPAK

Info

Publication number: CN212848388U
Application number: CN202022252849.1U
Authority: CN
Inventors: 陈杰华; 熊俊; 朱怀亮; 张欣; 殷杰
Original assignee: Taixing City Yongzhi Electronic Device Co ltd
Current assignee: Taixing City Yongzhi Electronic Device Co ltd
Priority date: 2020-10-10
Filing date: 2020-10-10
Publication date: 2021-03-30
Anticipated expiration: 2030-10-10

Abstract

The utility model provides a multi-row lead frame suitable for DPAK, relating to the technical field of integrated circuit lead wires and lead frames, comprising two parallel frames which are arranged oppositely, and 6 rows of 28 rows of frame units are arranged between the two frames; each frame unit comprises a base island, wherein a radiating fin is arranged on one side of the base island along the length direction of the frame, the radiating fins of the first row and the sixth row of frame units are respectively connected to the inner side wall of the frame close to the radiating fins, and the radiating fins in the frame units of the second row, the third row, the fourth row and the fifth row are mutually close and integrally formed; the base island is connected with a middle rib positioned at the opposite side of the radiating fin, and one end of the middle rib, which is far away from the base island, is connected with a connecting rib arranged along the length direction of the frame; one side of the connecting rib is connected with inner leads positioned at two sides of the middle rib, and the inner leads are in an L shape with a leaning opening facing the middle rib; the inner lead is connected with a first outer lead positioned on the other side of the connecting rib, and the middle rib is connected with a second outer lead positioned on the other side of the connecting rib.

Description

Multirow lead frame suitable for DPAK

Technical Field

The utility model relates to an integrated circuit lead wire and lead frame technical field especially relate to a multirow lead frame suitable for DPAK.

Background

The TO252 package is also called DPAK package, and is a plastic-packaged chip package, and is commonly used for packaging voltage stabilizing chips, power transistors and the like, and a high-power mos tube thereof is generally applied TO switching power supplies and electronic circuits with high input impedance. The packaging product is characterized in that the exposed large-area heat dissipation plate is directly welded and attached TO a PCB (printed circuit board), on one hand, large current can be output, on the other hand, heat dissipation can be realized through the PCB, meanwhile, the packaging heat resistance is reduced more efficiently, and the good performance of the packaging product enables the market demand of the packaging product TO be large for more than ten years, for example, products such as a computer mainboard, a power control switch on a new energy automobile, controllers on various electrical elements and the like need TO use TO 252.

With the increasing customer demands and the continuous progress of chip packaging, chip packaging is moving toward small volume, high stability and high quality, and thus the demand for lead frames is also increasing. The existing lead frame can not meet the user requirements more and more, therefore, a multi-row lead frame suitable for DPAK is needed to be designed, the frame unit is small in size, high in density, convenient to manufacture, material-saving, low in cost, not prone to layering and cracking during plastic packaging, high in product quality, and capable of effectively meeting the higher and higher use requirements of customers.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a multirow lead frame suitable for DPAK, its frame cell is small, density is high, convenient manufacturing, save material, reduce cost, difficult layering fracture during the plastic envelope, product quality is high, can effectively satisfy the increasingly high user demand of customer.

The above technical purpose of the present invention can be achieved by the following technical solutions:

a multi-row lead frame suitable for DPAK comprises two parallel and oppositely arranged frames, wherein the length of each frame is 249.499 +/-0.127 mm, and the distance between the sides of the two frames far away from each other is 67.500 +/-0.051 mm; the frames are arranged in rows along the length direction of the frames and in rows along the width direction, and 6 rows of 28 rows of frame units are arranged between the two frames; each frame unit comprises a base island, wherein a radiating fin is arranged on one side of the base island along the length direction of a frame, the radiating fins of the first row and the sixth row of the frame units are respectively connected to the inner side wall of the frame close to the radiating fins of the first row and the sixth row of the frame units, and the radiating fins in the frame units in the second row, the third row, the fourth row and the fifth row are mutually close and integrally formed; the base island is connected with a middle rib, the middle rib is positioned on the opposite side of the radiating fin, one end, far away from the base island, of the middle rib is connected with a connecting rib arranged along the length direction of the frame, and each row of frame units share one connecting rib; one side of the connecting rib is connected with inner leads positioned at two sides of the middle rib, the inner leads are in an L shape with a leaning opening facing the middle rib, a vertical section of the inner leads, which is vertical to the connecting rib, is connected with the connecting rib, and a horizontal section of the inner leads, which is parallel to the connecting rib, is close to the base island; the inner lead is connected with first outer leads which correspond to the inner lead in a one-to-one manner and are positioned on the other side of the connecting rib, the first outer leads are arranged along the extending direction of the vertical section of the inner lead, the first outer leads corresponding to each row of two rows of frame units in a group of two outer leads are arranged in a staggered manner, and two ends of each first outer lead are respectively connected to the frame unit where the first outer lead is positioned and the connecting rib in the adjacent row of frame units close to the first outer lead; the middle rib is connected with a second external lead wire positioned on the other side of the connecting rib, and the second external lead wires corresponding to each row in two rows of frame units in a group of two outer rows are arranged in a staggered manner; the part of the middle rib connected with the connecting rib, the inner lead, the first outer lead and the second outer lead are positioned above the base island, and the base island is distributed on two planes.

By adopting the technical scheme, the multi-row lead frame comprises 168 frame units in 6 rows and 28 columns, the length and the width of the multi-row lead frame are 249.499 +/-0.127 mm and 67.500 +/-0.051 mm respectively, and the 168 frame units are small in size, high in density, convenient to manufacture, material-saving and effective in reducing cost. The base island is used for installing the chip, uses bonding wire to connect inner lead and chip, and first outer lead is connected with external equipment's circuit board, and the fin is used for the heat dissipation, improves life. The base island is connected with the radiating fins and only connected with the middle ribs, and the middle ribs mainly support the base island, so that the base island is prevented from being emptied, and the overall strength of the base island is guaranteed. The second outer lead connected with the middle rib can be connected with a ground wire, so that the use safety of the equipment is ensured. The multi-row lead frame is convenient to manufacture and use, and can meet the increasingly high use requirements of use occasions such as voltage regulators and the like on the lead frame.

Furthermore, one end of each two second external lead wires corresponding to each row in two adjacent rows of frame units in a group is connected to the corresponding connecting rib, the ends, close to each other, of the two second external lead wires are horizontally connected, and the two second external lead wires form an ㄣ shape.

Through adopting above-mentioned technical scheme, the second is outer to lead different with first outer lead structure, is convenient for distinguish first outer lead and second outer lead during the use, cuts off the second outer lead, forms the 6R-2L lead frame that only two first outer leads can use, satisfies the user demand that only needs the use occasion of two outer leads, but still the outer lead of punching press second when punching press lead frame, guarantees the bulk strength of multirow lead frame, avoids multirow lead frame to break off in the production process.

Furthermore, the second outer lead is parallel to the first outer lead, and two ends of the second outer lead are respectively connected to the frame unit where the second outer lead is located and the connecting ribs in the adjacent row of frame units close to the second outer lead.

By adopting the technical scheme, the second outer lead has the same structure as the first outer lead, the second outer lead is not cut off when the lead frame is used, each frame unit comprises three outer leads including two first outer leads and one second outer lead, and a 6R-3L lead frame comprising three outer leads is formed, so that the use requirement of the use occasion requiring three outer leads is met, the 6R-2L lead frame and the 6R-3L lead frame are different only in the number of the outer leads, and the rest parts have the same structure, so that the application range is effectively improved, and the design cost and the production and manufacturing cost of a product are reduced.

Furthermore, in the frame units from the second row to the fifth row and from the second row to the twenty-seventh row, reinforcing ribs arranged along the length direction of the frame are connected between the radiating fins in two adjacent rows and two adjacent columns of the two-to-one group, and the reinforcing ribs are positioned on connecting lines of the radiating fins in two adjacent rows of the two-to-one group.

Through adopting above-mentioned technical scheme, the fin of first row and sixth row is connected on the frame, and in the frame cell of second row to fifth row, second row to twenty-seventh row, the strengthening rib that sets up along frame length direction is connected between the fin in two liang of adjacent two rows, adjacent two of a set of, and the strengthening rib improves the bulk strength of multirow lead frame, avoids multirow lead frame to break off in the production process, also avoids multirow lead frame to take place deformation. And the first row of frame units and the twenty-eighth row of frame units are positioned at two sides and are not provided with connecting ribs, so that the consumable items in production and manufacturing are reduced, and the structure of a multi-row lead frame is simplified to a certain extent.

Furthermore, first V-shaped grooves which are sequentially communicated end to end are annularly arranged on the periphery of the base island, and the angle of each first V-shaped groove is 60 degrees.

Through adopting above-mentioned technical scheme, set up the first V type groove around the base island and not only can play waterproof effect, can improve the cohesion of base island and plastic-sealed body moreover, avoid plastic-sealed material layering fracture, guarantee the plastic-sealed effect. Wherein, the angle in first V type groove is 60, and the angle is moderate, and convenient the manufacturing, can not only guarantee the water-proof effects in first V type groove, improve the effect of the cohesion of base island and plastic-sealed body all better, avoids the waste of the too big plastic-sealed material that causes of angle moreover, its simple structure, and the effect is obvious.

Furthermore, the abutment outside the first V-shaped groove is annularly arranged around the base island, and the upper end face of the abutment is flush with the upper end face of the base island.

Through adopting above-mentioned technical scheme, the pier is equivalent to the periphery of extension base island, has both avoided first V type groove too near the base island periphery, influences the cohesion of the part between base island periphery and first V type groove and the plastic-sealed body, avoids again that first V type groove too near the base island center influences the installation of chip on the base island. The pier effectively improves the binding force of the base island and the plastic package body while ensuring the using area of the base island, and avoids the plastic package body from layering and cracking near the first V-shaped groove.

Further, the upper end face and the lower end face of inner lead and the upper end face and the lower end face of well muscle are equallyd divide and are equipped with the second V type groove that is close to the splice bar respectively, just the angle in second V type groove is 90.

Through adopting above-mentioned technical scheme, all set up second V type groove at the up end of inner lead wire and the up end of lower terminal surface and well muscle and terminal surface down, likewise, second V type groove also plays waterproof and the effect that improves the cohesion of inner lead wire, well muscle and plastic-sealed body. The difference is that the angle in second V type groove is 90, because the width of internal lead and centre is less, so the size in second V type groove is little a lot relatively first V type groove, and consequently the angle in second V type groove will be enough, guarantees its waterproof and improves the result of use with the plastic-sealed body cohesion, and second V type groove is less moreover, and the great waste that also can not cause too many plastic-sealed materials of angle.

Furthermore, the radiating fin is provided with a resin hole which is close to the base island and is arranged along the length direction of the frame, the resin hole penetrates through the radiating fin, and the opening width of the upper end face of the resin hole is smaller than that of the lower end face of the resin hole.

Through adopting above-mentioned technical scheme, set up the resin hole in order to improve the cohesion of plastic-sealed body and fin, resin hole up end opening width is less than terminal surface opening width down, can avoid plastic-sealed body layering, fracture, guarantees the plastic envelope effect, its simple structure, and the effect is obvious.

Furthermore, the upper end face of the heat dissipation sheet is provided with dovetail grooves which are positioned at two sides of the resin hole and arranged along the length direction of the frame, and the dovetail angle of each dovetail groove is 60 degrees.

By adopting the technical scheme, the dovetail groove is arranged to improve the bonding force between the plastic package body and the radiating fin, the resin hole penetrates through the radiating fin, the dovetail groove does not penetrate through the radiating fin, the bonding force between the plastic package body and the radiating fin is improved by matching the dovetail groove and the resin hole, the effect is optimal, and the integral strength of the radiating fin can be ensured.

Further, two V-shaped notches which are symmetrically arranged are respectively arranged on the outer wall of the frame, the V-shaped notches are positioned between two adjacent two columns of frame units from the second column to the twenty-seventh column, and the angle of each V-shaped notch is 90 degrees.

Through adopting above-mentioned technical scheme, the V type incision that sets up on the frame plays sign and positioning action, is convenient for divide 28 frame element row and opens, and the notched angle of V type is 90, more conveniently goes into the sword, guarantees frame element's the quality of cutting off, effectively reduces the rejection rate, avoids the cutter to leave the vestige at the frame lateral wall simultaneously, guarantees frame element's surface quality.

To sum up, the utility model discloses following beneficial effect has:

1. by arranging two parallel and oppositely arranged frames, the length of each frame is 249.499 +/-0.127 mm, the distance between the sides of the two frames far away from each other is 67.500 +/-0.051 mm, 6 rows of 28 rows of frame units and two rows of lead frames in the two frames comprise 168 frame units in 6 rows and 28 rows, and the 168 frame units have small volume and high density, are convenient to manufacture, save materials and effectively reduce the cost;

2. through setting up first V type groove, second V type groove, resin hole, dovetail isotructure and improving the cohesion of plastic-sealed body and frame cell support, avoid layering, fracture, guarantee the encapsulation effect, product quality is high, can effectively satisfy the increasingly high user demand of customer.

Drawings

Fig. 1 is a schematic diagram illustrating an overall structure of a multi-row lead frame suitable for DPAK according to an embodiment;

fig. 2 is a side view of a multi-row lead frame suitable for DPAK according to one embodiment;

FIG. 3 is a partial schematic diagram of a multi-row lead frame suitable for DPAK according to an embodiment;

FIG. 4 is a diagram illustrating a set of two frame units in a multi-row lead frame suitable for DPAK according to an embodiment;

FIG. 5 is a cross-sectional view taken at perspective A-A, B-B, C-C of FIG. 4;

FIG. 6 is a cross-sectional view taken at perspective D-D, E-E of FIG. 4;

fig. 7 is a partial structural diagram of a multi-row lead frame suitable for DPAK according to the second embodiment.

In the figure, 1, a frame; 11. an elliptical hole; 12. removing glue holes; 13. positioning holes; 14. identifying a hole; 15. a V-shaped cut; 2. a frame unit; 3. a base island; 31. a first V-shaped groove; 32. Pier abutment; 4. a heat sink; 41. resin holes; 42. a dovetail groove; 43. reinforcing ribs; 44. a kidney-shaped hole; 5. a middle rib; 51. a second outer lead; 6. an inner lead; 61. a first outer lead; 7. Connecting ribs; 8. and a second V-shaped groove.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.

The first embodiment is as follows:

a multi-row lead frame suitable for DPAK (dual leadframe adhesive) is shown in figure 1 and comprises two frames 1 which are parallel to each other and are oppositely arranged, wherein the length of each frame 1 is 249.499mm, the deviation of +/-0.127 mm is allowed, and the distance between the sides of the two frames 1 which are far away from each other is 67.500mm, the deviation of +/-0.051 mm is allowed. 168 frame units 2 in 6 rows and 28 columns are arranged between two frames 1, wherein the frame units are arranged in rows along the length direction of the frame 1 and in columns along the width direction of the frame 1. 168 frame unit 2 high density is arranged, and is small, makes things convenient for integrative punching press of modularization to make, saves material, and effective reduce cost can satisfy the user demand of small-size, high quality, high stability.

As shown in fig. 1 and 3, each frame unit 2 has the same structure and comprises a base island 3, a radiating fin 4 is arranged on one side of the base island 3 along the length direction of the frame 1, the radiating fins 4 of the first row and the sixth row of frame units 2 are respectively connected to the inner side wall of the frame 1 close to the base island, and the radiating fins 4 in the frame units 2 in the second row and the third row, the fourth row and the fifth row are mutually close and integrally formed, namely the radiating fins 4 in the frame units 2 in the first row and the second row are opposite, the radiating fins 4 in the frame units 2 in the third row and the fourth row are opposite, and the radiating fins 4 in the frame units 2 in the fifth row and the sixth row are also opposite.

As shown in fig. 1 and 3, waist-shaped holes 44 are formed at the joints of the heat dissipation fins 4 and the frame 1 in the first row and the sixth row of frame units 2 along the length direction of the frame 1, and the same waist-shaped holes 44 are formed between two heat dissipation fins 4 which are adjacent to each other and integrally formed in the second row to the fifth row of frame units 2, so as to facilitate slitting. In addition, in the frame units 2 in the second row to the fifth row and the second row to the twenty-seventh row, the reinforcing ribs 43 located on the connecting lines of the two waist-shaped holes 44 are connected between the radiating fins 4 in the four frame units 2 in two adjacent rows and two adjacent columns of the two-by-two group, so as to improve the overall strength of the multi-row lead frame.

As shown in fig. 2 and 3, the base island 3 in each frame unit 2 is connected with a middle rib 5 located on the opposite side of the heat sink 4, one end of the middle rib 5 far away from the base island 3 is connected with a connecting rib 7 arranged along the length direction of the frame 1, the connecting rib 7 and the base island 3 are located on two different planes, and the connecting rib 7 is located above the base island 3. The middle rib 5 is arranged in a bending mode, one end of the middle rib is connected with the base island 3, the other end of the middle rib is connected with the connecting rib 7, and each row of frame units 2 share one connecting rib 7. One side that is close to base island 3 at splice bar 7 is connected with and is located 5 both sides of well muscle, and lie in the coplanar with splice bar 7 internal lead 6, and internal lead 6 is by mouthful L type form towards well muscle 5, and its vertical section of perpendicular splice bar 7 is connected with splice bar 7, and its horizontal segment that is on a parallel with splice bar 7 is close to base island 3.

As shown in fig. 3 and 4, the two inner leads 6 in each frame unit 2 are respectively connected with first outer leads 61 which are in one-to-one correspondence with the inner leads and located on the other side of the connecting rib 7, and the first outer leads 61 are arranged along the extending direction of the vertical section of the inner leads 6. In each row of two rows of frame units 2, each row of the two rows of frame units is a group of two, including a first row, a second row, a third row, a fourth row, a fifth row and a sixth row, four first outer leads 61 corresponding to each other in a staggered manner, and two ends of each first outer lead 61 are respectively connected to the frame unit 2 where the first outer lead is located and the connecting rib 7 in the adjacent row of frame units 2 close to the first outer lead 61. For example, the first outer lead 61 in the lead frame of the first row and the first column has one end connected to the connecting rib 7 of the first row and the other end connected to the connecting rib 7 of the second row; the first outer lead 61 in the lead frame of the second row and the first column has one end connected to the connecting rib 7 of the second row and one end connected to the connecting rib 7 of the first row.

As shown in fig. 3 and 4, the middle rib 5 in each frame unit 2 is connected with the second outer lead 51 located on the same side as the first outer lead 61, like the first outer lead 61, two second outer leads 51 corresponding to each row in two rows of frame units 2 in a two-by-two group are also arranged in a staggered manner, and one end of each second outer lead 51 close to the corresponding middle rib 5 is also connected with the corresponding connecting rib 7. In this embodiment, the length of each second outer lead 51 is only half of the length of the corresponding first outer lead 61, one end of each row of the two adjacent rows of frame units 2 in a pair of two adjacent rows of frame units is horizontally connected, and the two second outer leads 51 form an "ㄣ" shape. The structure of the second outer lead 51 is different from that of the first outer lead 61, the first outer lead 61 and the second outer lead 51 can be distinguished conveniently during use, the second outer lead 51 is cut off, a 6R-2L lead frame which only has two first outer leads 61 can be used is formed, and the use requirement of the use occasion which only needs two outer leads is met.

As shown in fig. 4 and 5, in order to improve the bonding force between the plastic package body and the base island 3 and avoid the plastic package body from layering and cracking, first V-shaped grooves 31 which are sequentially communicated end to end are annularly arranged around the base island 3 in each frame unit 2; abutments 32 positioned outside the first V-shaped grooves 31 are arranged around the base island 3 in an annular mode, and the upper end face of the abutments 32 is flush with the upper end face of the base island 3. The first V-shaped groove 31 can not only improve the binding force between the plastic package body and the base island 3, but also play a role in water resistance; the abutment 32 is equivalent to the extension of the periphery of the base island 3, so that the use area of the base island 3 is ensured, the first V-shaped groove 31 is prevented from being too close to the periphery of the base island 3, the bonding force between the periphery of the base island 3 and the first V-shaped groove 31 and the plastic package body is prevented from being influenced, and the plastic package body is prevented from being layered and cracked near the first V-shaped groove 31. Wherein, the angle of first V type groove 31 is 60, and the angle is moderate, and convenient the manufacturing can not only guarantee first V type groove 31 waterproof effect, improve the effect of the cohesion of base island 3 and plastic-sealed body all better, avoids the waste of the plastic-sealed material that the angle is too big to cause moreover.

As shown in fig. 4 and 5, in order to improve the bonding force between the plastic package body and the inner lead 6 and the middle rib 5 and avoid the plastic package body from being layered and cracked, the upper end surface and the lower end surface of the inner lead 6 and the upper end surface and the lower end surface of the middle rib 5 are respectively provided with a second V-shaped groove 8 close to the connecting rib 7, and the second V-shaped groove 8 is located on the vertical section of the inner lead 6 and the vertical section of the middle rib 5 perpendicular to the connecting rib 7. Similarly, the second V-shaped groove 8 also has the effects of preventing water and improving the bonding force between the inner lead 6, the middle rib 5 and the plastic package body. The difference is that the angle of second V type groove 8 is 90, because the width of internal lead 6 and centre is less, so the size of second V type groove 8 is for a lot less than first V type groove 31, consequently the angle of second V type groove 8 will be enough, guarantee its waterproof and improve the result of use with the plastic-sealed body cohesion, second V type groove 8 is less moreover, and the great waste that also can not cause too many plastic-sealed materials of angle.

As shown in fig. 4 and 6, in order to improve the bonding force between the plastic package body and the heat sink 4 and avoid delamination and cracking, the heat sink 4 is provided with a resin hole 41 which is close to the base island 3 and is arranged along the length direction of the frame 1, the resin hole 41 penetrates through the heat sink 4, and the opening width of the upper end face of the resin hole 41 is smaller than the opening width of the lower end face; dovetail grooves 42 are provided on both sides of the resin hole 41 in the longitudinal direction, and the dovetail grooves 42 are provided on the upper end surface of the heat sink 4 so as not to penetrate the heat sink 4. The resin holes 41 and the dovetail grooves 42 can increase the bonding force between the plastic package body and the radiating fin 4, and particularly, the width of the opening of the upper end face of the resin hole 41 is smaller than that of the opening of the lower end face, so that the plastic package body can be effectively prevented from being layered and cracked. The resin holes 41 penetrate the heat sink 4 without penetrating the dovetail grooves 42 through the heat sink 4, so that the coupling force between the molded body and the heat sink 4 is improved to the maximum and the overall strength of the heat sink 4 can be ensured. Wherein the dovetail angle of the dovetail groove 42 is 60 °.

As shown in fig. 1 and 3, fourteen groups of holes are arranged in an array on the frame 1 at the upper end, the fourteen groups of holes correspond to two rows of two frame units 2 in a group of two, and the holes include elliptical holes 11, glue removing holes 12 and positioning holes 13 which are sequentially arranged, wherein the elliptical holes 11 and the positioning holes 13 correspond to one row of the frame units 2 respectively, and the glue removing holes 12 are located between two adjacent rows of the frame units 2 in a group of two. Fourteen groups of holes are also arranged on the frame 1 at the lower end in an array mode, and the fourteen groups of holes comprise positioning holes 13, adhesive removing holes 12 and identification holes 14 which are sequentially arranged. Fourteen groups of holes at the upper end and fourteen groups of holes at the lower end are arranged in a staggered mode, the elliptical holes 11 are used for positioning of the plastic package film, the positioning holes 13 are used for positioning of the multi-row lead frames, the glue removing holes 12 are used for removing redundant plastic package materials, and the identification holes 14 are used for identifying types of the multi-row lead frames. Wherein, glue removing holes 12 are also arranged between the connecting ribs 7 in the two rows of frame units 2 in a group of two.

As shown in fig. 1 and 3, in order to cut off the frame units 2 conveniently, V-shaped notches 15 are symmetrically arranged on the outer walls of the two side frames 1, the V-shaped notches 15 are located between two adjacent two columns of frame units 2 in the second to twenty-seventh columns, and the angle of the V-shaped notches 15 is 90 °. V type incision 15 plays sign and positioning action, is convenient for divide 28 frame element 2 to open, and V type incision 15's angle is 90, more conveniently goes into the sword, guarantees frame element 2's the quality of cutting off, effectively reduces the rejection rate, avoids the cutter to leave the vestige at frame 1 lateral wall simultaneously, guarantees frame element 2's surface quality.

Example two:

as shown in fig. 3 and 7, the multi-row lead frame suitable for DPAK is different from the first embodiment in that the second outer lead 51 connected to the middle rib 5 in the present embodiment is parallel to the first outer lead 61 and has the same length as the first outer lead 61, the structure of the second outer lead 51 is the same as that of the first outer lead 61, and the second outer lead 51 corresponds to the third first outer lead 61. When the lead frame is used, the second outer lead 51 is not cut off, each frame unit 2 comprises three outer leads including two first outer leads 61 and one second outer lead 51, a 6R-3L lead frame comprising the three outer leads is formed, the use requirement of the use occasion requiring the three outer leads is met, the 6R-2L lead frame and the 6R-3L lead frame are different only in the number of the outer leads, the structures of the rest parts are the same, the application range is effectively improved, and the product design cost and the production and manufacturing cost are reduced.

While the foregoing description shows and describes the preferred embodiments of the present invention, it is to be understood that the invention is not limited to the forms disclosed herein, but is not intended to be exhaustive or to exclude other embodiments and may be used in various other combinations, modifications, and environments and is capable of changes within the scope of the inventive concept as expressed herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. But that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention, which is to be limited only by the claims appended hereto.

Claims

1. A multirow lead frame suitable for DPAK, its characterized in that: the device comprises two parallel and oppositely arranged frames (1), wherein the length of each frame (1) is 249.499 +/-0.127 mm, and the distance between the sides of the two frames (1) far away from each other is 67.500 +/-0.051 mm; the frames (1) are arranged in rows along the length direction and in rows along the width direction, and 6 rows and 28 rows of frame units (2) are arranged between the two frames (1); each frame unit (2) comprises a base island (3), wherein a radiating fin (4) is arranged on one side of the base island (3) along the length direction of the frame (1), the radiating fins (4) of the first row and the sixth row of the frame units (2) are respectively connected to the inner side wall of the frame (1) close to the first row and the sixth row, and the radiating fins (4) in the frame units (2) in a group of two of the second row, the third row, the fourth row and the fifth row are close to each other and are integrally formed; the base island (3) is connected with a middle rib (5), the middle rib (5) is positioned on the opposite side of the radiating fin (4), one end, far away from the base island (3), of the middle rib (5) is connected with a connecting rib (7) arranged along the length direction of the frame (1), and each row of frame units (2) share one connecting rib (7); one side of the connecting rib (7) is connected with inner leads (6) positioned at two sides of the middle rib (5), the inner leads (6) are in an L shape with a leaning opening facing the middle rib (5), a vertical section of the inner leads, which is vertical to the connecting rib (7), is connected with the connecting rib (7), and a horizontal section, which is parallel to the connecting rib (7), is close to the base island (3); the inner leads (6) are connected with first outer leads (61) which correspond to the inner leads one by one and are positioned on the other side of the connecting ribs (7), the first outer leads (61) are arranged along the extending direction of the vertical section of the inner leads (6), the first outer leads (61) corresponding to each row of two rows of frame units (2) in a group of two outer leads are arranged in a staggered manner, and two ends of each first outer lead (61) are respectively connected to the frame unit (2) where the first outer lead is positioned and the connecting ribs (7) in the adjacent row of frame units (2) close to the first outer lead; the middle rib (5) is connected with second external leads (51) positioned on the other side of the connecting rib (7), and the second external leads (51) corresponding to each row in two rows of frame units (2) in a group of two rows are arranged in a staggered mode; the part of the middle rib (5) connected with the connecting rib (7), the inner lead (6), the first outer lead (61) and the second outer lead (51) are positioned above the base island (3) and the base island (3) are distributed on two planes.

2. The multi-row lead frame suitable for DPAK according to claim 1, wherein: one end of each corresponding two second external lead wires (51) in two adjacent rows of frame units (2) in a group is connected to the corresponding connecting rib (7), the ends, close to each other, of the two second external lead wires (51) are horizontally connected, and the two second external lead wires (51) form an ㄣ shape.

3. The multi-row lead frame suitable for DPAK according to claim 1, wherein: the second outer lead (51) is parallel to the first outer lead (61), and two ends of the second outer lead (51) are respectively connected to the frame unit (2) where the second outer lead is located and the connecting ribs (7) in the adjacent row of frame units (2) close to the second outer lead.

4. A multi-row lead frame suitable for DPAK according to claim 2 or 3, characterized in that: in the frame units (2) from the second row to the fifth row and from the second row to the twenty-seventh row, reinforcing ribs (43) arranged along the length direction of the frame (1) are connected between the radiating fins (4) in two adjacent rows and two adjacent columns of the two-two group, and the reinforcing ribs (43) are positioned on connecting lines of the radiating fins (4) in the two adjacent rows of the frame units (2) of the two-two group.

5. A multi-row lead frame suitable for DPAK according to claim 2 or 3, characterized in that: the base island (3) is surrounded by first V-shaped grooves (31) which are sequentially communicated end to end, and the angle of the first V-shaped groove (31) is 60 degrees.

6. The multi-row lead frame suitable for DPAK according to claim 5, wherein: the foundation island is characterized in that abutments (32) located outside the first V-shaped grooves (31) are arranged around the foundation island (3) in a surrounding mode, and the upper end face of each abutment (32) is flush with the upper end face of the foundation island (3).

7. A multi-row lead frame suitable for DPAK according to claim 2 or 3, characterized in that: the up end and the lower terminal surface of inner lead (6) and the up end and the lower terminal surface of well muscle (5) are equallyd divide and are equipped with second V type groove (8) that are close to splice bar (7) respectively, just the angle in second V type groove (8) is 90.

8. A multi-row lead frame suitable for DPAK according to claim 2 or 3, characterized in that: the radiating fin (4) is provided with a resin hole (41) which is close to the base island (3) and is arranged along the length direction of the frame (1), the resin hole (41) penetrates through the radiating fin (4), and the opening width of the upper end face of the resin hole (41) is smaller than that of the lower end face.

9. The multi-row lead frame for DPAK according to claim 8, wherein: the upper end face of the radiating fin (4) is provided with dovetail grooves (42) which are positioned on two sides of the resin hole (41) and arranged along the length direction of the frame (1), and the dovetail angle of each dovetail groove (42) is 60 degrees.

10. A multi-row lead frame suitable for DPAK according to claim 2 or 3, characterized in that: two be equipped with V type incision (15) that the symmetry set up on frame (1) outer wall respectively, V type incision (15) are located between two frame cell (2) of two liang of a set of adjacent two of second row to twenty-seventh row, just the angle of V type incision (15) is 90.