High-density lead frame

Abstract

The utility model provides a high-density lead frame, and relates to the field of lead frames, and the high-density lead frame comprises a plurality of base island groups, the plurality of base island groups are distributed in an array, an outer pin is arranged between every two adjacent base island groups, and a cross beam is arranged between each base island group and the corresponding outer pin. Longitudinal beams are arranged on the outer side of the base island group at the leftmost end and the outer side of the base island group at the rightmost end. According to the utility model, the length of the outer pins is accurately controlled, and the outer pins do not participate in cutting during separation, so that the distance between the upper and lower adjacent base island groups can be effectively reduced, and the density of the lead frame is higher.

Description

Technical Field

[0001] The present application relates to the field of lead frames, and in particular to a high-density lead frame. Background Art

[0002] With the development of semiconductor lead frame design, customers have higher and higher requirements for product density. The design of existing products is arranged according to the traditional cutting method. When the product is cut from the frame, part of the length of the outer legs will remain on the frame. The residual length increases the spacing between each row of the lead frame and reduces the number of frame rows. Summary of the Invention

[0003] The purpose of the embodiments of the present application is to provide a high-density lead frame that can solve the above-mentioned technical problems.

[0004] An embodiment of the present application provides a high-density lead frame, comprising a plurality of base island groups, wherein the plurality of base island groups are distributed in an array, an outer foot is provided between two adjacent base island groups, a cross beam is provided between the base island groups and the outer foot, and a longitudinal beam is provided on the outer side of the leftmost base island group and the outer side of the rightmost base island group.

[0005] Preferably, the base island group includes a first base island and a second base island, pins are provided on the first base island and the second base island, and the first base island and the second base island are staggered and inverted.

[0006] Preferably, guide holes are provided between the middle base island groups, and the guide holes are arranged in an elliptical shape.

[0007] Preferably, positioning holes are provided on the outer side of the uppermost base island group and the outer side of the lowermost base island group, and the positioning holes are arranged in a circular shape.

[0008] Preferably, the distance between adjacent base island groups is 3-4 mm.

[0009] Preferably, there are at least three base island groups in each row.

[0010] Preferably, the outer legs are arranged intermittently.

[0011] Beneficial effects of the utility model:

[0012] The utility model provides a high-density lead frame, including multiple base island groups, which are distributed in an array, with outer feet arranged between two adjacent base island groups, cross beams arranged between the base island groups and the outer feet, and longitudinal beams arranged on the outer sides of the leftmost base island group and the rightmost base island group; the utility model adopts precise control of the length of the outer feet, and the outer feet do not participate in cutting during separation, which can effectively reduce the distance between the upper and lower adjacent base island groups, so that the density of the lead frame is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0014] Figure 1 It is a structural diagram of the present utility model.

[0015] The reference numerals are:

[0016] 1. Base island group; 2. External feet; 3. Crossbeam; 4. Longitudinal beam; 5. First base island; 6. Second base island; 7. Pipe feet; 8. Diversion hole; 9. Positioning hole. DETAILED DESCRIPTION

[0017] To make the objectives, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Generally, 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.

[0018] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for protection, but merely represents selected embodiments of the present application. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments in the present application without creative work are within the scope of protection of the present application.

[0019] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0020] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the product of this application is typically placed when in use. These terms are intended only to facilitate the description of this application and simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0021] Furthermore, terms such as "horizontal," "vertical," and "overhanging" do not necessarily imply that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0022] It should also be noted that, in the description of this application, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0023] like Figure 1 As shown, a high-density lead frame includes multiple base island groups 1, and the multiple base island groups 1 are distributed in an array. An outer foot 2 is arranged between two adjacent base island groups 1, and a crossbeam 3 is arranged between the base island group 1 and the outer foot 2. A longitudinal beam 4 is arranged on the outer side of the leftmost base island group 1 and the outer side of the rightmost base island group 1; the utility model adopts precise control of the length of the outer foot 2, and the outer foot 2 does not participate in cutting during separation, which can effectively reduce the distance between the upper and lower adjacent base island groups 1, so that the density of the lead frame is higher.

[0024] like Figure 1 As shown, in this embodiment, the base island group 1 includes a first base island 5 and a second base island 6, and pins 7 are provided on the first base island 5 and the second base island 6. The first base island 5 and the second base island 6 are staggered and inverted. The distance between adjacent base island groups 1 is 3-4 mm. The first base island 5 and the second base island 6 that are staggered and inverted can further reduce the distance between the base islands. In the vertical direction, the spacing between the upper row and the lower row is reduced from 4.30 mm to 3.15 mm, and the number of product rows is increased from 6R to 8R, so that the number of products is increased.

[0025] like Figure 1 As shown, in this embodiment, a guide hole 8 is provided between the base island groups 1 in the middle. The guide hole 8 is elliptical. The guide hole 8 of the present invention is used to release stress during glue injection.

[0026] like Figure 1 As shown, in this embodiment, positioning holes 9 are provided on the outer side of the uppermost base island group 1 and the outer side of the lowermost base island group 1. The positioning holes 9 are arranged in a circular shape. The positioning holes 9 of the utility model are convenient for positioning during processing and for accurately cutting off the first base island 5 and the second base island 6.

[0027] like Figure 1 As shown, in this embodiment, in order to further improve the density of the present invention, at least three base island groups 1 are provided in each row.

[0028] like Figure 1 As shown, in this embodiment, in order to save costs and facilitate processing, the outer legs 2 are arranged intermittently.

[0029] The above are merely preferred embodiments of the present application and are not intended to limit the present application. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A high-density lead frame, characterized in that: It includes multiple base island groups, which are distributed in an array, with outer feet arranged between two adjacent base island groups, cross beams arranged between the base island groups and the outer feet, and longitudinal beams arranged on the outer sides of the leftmost base island group and the rightmost base island group.

2. The high-density lead frame according to claim 1, wherein: The base island group includes a first base island and a second base island. Pins are arranged on the first base island and the second base island. The first base island and the second base island are arranged in an inverted and staggered manner.

3. The high-density lead frame according to claim 1, wherein: A flow guide hole is provided between the base island groups in the middle, and the flow guide hole is arranged in an elliptical shape.

4. The high-density lead frame according to claim 1, wherein: Positioning holes are provided on the outer side of the uppermost base island group and the outer side of the lowermost base island group, and the positioning holes are arranged in a circular shape.

5. The high-density lead frame according to claim 1, wherein: The distance between adjacent base island groups is 3-4 mm.

6. The high-density lead frame according to claim 1, wherein: There are at least three base island groups in each row.

7. The high-density lead frame according to claim 1, characterized in that: The outer legs are arranged intermittently.

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