A DFN-3 terminal lead frame

Abstract

The utility model provides a kind of DFN-3 terminal lead frame, comprising: frame body, multiple unetched areas, multiple half-etching areas and multiple reinforcing ribs, multiple unetched areas, multiple half-etching areas and multiple reinforcing ribs are all set on the surface of frame body, multiple reinforcing ribs are set between multiple unetched areas and multiple half-etching areas.The utility model provides a kind of DFN-3 terminal lead frame, by the setting of reinforcing rib, when using, reinforcing rib is distributed in the periphery of each unit product, and is located between unetched area and half-etching area, it is not carried out half-etching treatment as entity frame, forms firm support to unit product from local by its own structural characteristics, and then the anti-deformation ability of entire frame strip is improved, which makes the frame in production, transportation and assembly process, can better resist external force effect, reduce the adverse effect caused by deformation on subsequent packaging process precision, guarantee the quality stability of packaging product.

Description

Technical Field

[0001] This utility model relates to the field of semiconductor packaging technology, and in particular to a DFN-3 terminal lead frame. Background Technology

[0002] The lead frame is a key basic component of semiconductor packaging. As a bridge connecting the chip to the external circuit, its structural stability and processing performance directly affect the quality and production efficiency of the packaged products.

[0003] DFN packaging is widely used in the field of electronic components due to its advantages such as small size and good heat dissipation. DFN-3 terminal lead frame is a common type of DFN package, which is mainly used to meet the miniaturized packaging requirements of specific circuit connections.

[0004] However, the existing DFN-3 terminal lead frame lacks a reinforcing structure, making it prone to deformation due to external forces during production, transportation, and assembly. This results in insufficient overall strength of the frame strip, affecting the accuracy of subsequent packaging processes.

[0005] Therefore, it is necessary to provide a DFN-3 terminal lead frame to solve the above-mentioned technical problems. Utility Model Content

[0006] This invention provides a DFN-3 terminal lead frame, which solves the problem of insufficient strength of existing DFN-3 terminal lead frames.

[0007] To solve the above technical problems, this utility model provides a DFN-3 terminal lead frame, comprising:

[0008] The frame body comprises multiple unetched areas, multiple semi-etched areas, and multiple reinforcing ribs. The multiple unetched areas, multiple semi-etched areas, and multiple reinforcing ribs are all disposed on the surface of the frame body, and the multiple reinforcing ribs are disposed between the multiple unetched areas and the multiple semi-etched areas.

[0009] Preferably, the inner surfaces of the plurality of semi-etched areas are provided with a plurality of semi-circular notches.

[0010] Preferably, all of the reinforcing ribs are cross-shaped.

[0011] Preferably, the DFN-terminal lead frame further includes a plurality of positioning holes, all of which are located on the top of the frame body.

[0012] Preferably, the plurality of positioning holes are evenly distributed along the top edge of the frame body for positioning the frame body during processing and assembly.

[0013] Preferably, the DFN-terminal lead frame further includes multiple cutting grooves, all of which are formed on the inner side of the semi-etched area.

[0014] Preferably, the plurality of cutting grooves are respectively disposed on the sides of the plurality of semi-circular notches.

[0015] Compared with related technologies, the DFN-3 terminal lead frame provided by this utility model has the following beneficial effects:

[0016] This utility model provides a DFN-3 terminal lead frame. With the addition of reinforcing ribs, these ribs are distributed around each unit product during use, located between the unetched and semi-etched areas. As a solid frame without semi-etching, it provides stable support to the unit product locally based on its own structural characteristics, thereby improving the deformation resistance of the entire frame strip. This allows the frame to better resist external forces during production, transportation, and assembly, reducing the adverse effects of deformation on the accuracy of subsequent packaging processes and ensuring the quality stability of the packaged product. Attached Figure Description

[0017] Figure 1 A schematic diagram of the structure of a first embodiment of a DFN-3 terminal lead frame provided by this utility model;

[0018] Figure 2 for Figure 1 The diagram shows a partial structure.

[0019] Figure 3 for Figure 2 The enlarged schematic diagram of part A shown below;

[0020] Figure 4 for Figure 3 The diagram shows a partial structure.

[0021] Figure 5 A schematic diagram of the structure of a second embodiment of a DFN-3 terminal lead frame provided by this utility model;

[0022] Figure 6 This is a structural schematic diagram of a third embodiment of a DFN-3 terminal lead frame provided by this utility model.

[0023] The diagram is labeled as follows: 1. Frame body, 2. Reinforcing rib, 3. Unetched area, 4. Semi-etched area, 5. Semi-circular notch, 6. Positioning hole, 7. Cutting groove. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0025] First Embodiment

[0026] Please refer to the following: Figure 1 , Figure 2 , Figure 3 , Figure 4 ,in, Figure 1 A schematic diagram of the structure of a first embodiment of a DFN-3 terminal lead frame provided by this utility model; Figure 2 for Figure 1 The diagram shows a partial structure. Figure 3 for Figure 2 The enlarged schematic diagram of part A shown below; Figure 4 for Figure 3 The diagram shows a partial structure.

[0027] A DFN-3 terminal lead frame includes: a frame body 1, a plurality of unetched areas 3, a plurality of semi-etched areas 4, and a plurality of reinforcing ribs 2. The plurality of unetched areas 3, the plurality of semi-etched areas 4, and the plurality of reinforcing ribs 2 are all disposed on the surface of the frame body 1, and the plurality of reinforcing ribs 2 are disposed between the plurality of unetched areas 3 and the plurality of semi-etched areas 4.

[0028] Multiple semi-circular notches 5 are provided on the inner surfaces of the multiple semi-etched areas 4.

[0029] All of the reinforcing ribs 2 are cross-shaped.

[0030] The frame body 1 is made of copper and other materials with excellent conductivity. The whole is composed of 4 modules to form a strip with a specification of 70*250mm. Each module has a matrix layout of 52 rows and 35 columns. This layout can realize the orderly arrangement of multiple unit products in a limited space, improving production efficiency and space utilization. Multiple unetched areas 3 are solid areas on the frame that have not undergone semi-etching treatment. They retain the original thickness and strength of the material and are mainly used to support chips and realize core functions such as circuit connection. Multiple semi-etched areas 4 are areas that have undergone partial etching treatment. Their thickness is thinner than the unetched areas and can form specific circuit paths or structural outlines according to packaging requirements. Multiple reinforcing ribs 2 are distributed on the surface of the frame body 1 along with the unetched areas 3 and semi-etched areas 4, and are precisely set between the unetched areas 3 and semi-etched areas 4. Through this positional design, the reinforcing ribs can effectively support the connection between the two areas and fill the structural weak points between different etched areas.

[0031] The semi-circular notch 5 is located at a specific position on the inner side of the semi-etched area 4, and it cooperates with the cutting channel area of ​​the frame. The cutting channel area serves as the reference path for subsequent cutting processes. The semi-circular notch 5 is distributed in the lead frame terminal connector part within the cutting channel. Its arc-shaped structure can disperse stress during the cutting process, avoiding tearing or deformation caused by concentrated material stress during cutting. At the same time, this design can also guide the cutting blade to accurately position, ensuring the accuracy of the cutting position, effectively reducing the occurrence of burr-like metal chips on the edge of the product after cutting, thereby ensuring cutting quality and reducing the difficulty of subsequent cleaning processes.

[0032] The working principle of the DFN-3 terminal lead frame provided by this utility model is as follows:

[0033] During the production process, the modular matrix layout of the frame body 1 ensures that the unit products are arranged in an orderly manner; the reinforcing rib 2 connects and reinforces the unetched area 3 and the semi-etched area 4 through a cross-shaped solid structure, resisting external forces and reducing frame deformation during handling and processing; the semi-circular notch 5 of the semi-etched area 4 prepares for the subsequent cutting process and reduces stress concentration during cutting.

[0034] Compared with related technologies, the DFN-3 terminal lead frame provided by this utility model has the following beneficial effects:

[0035] By setting the reinforcing ribs 2, during use, the reinforcing ribs 2 are distributed around each unit product and located between the unetched area 3 and the semi-etched area 4. As a solid frame without semi-etching treatment, it provides stable support to the unit product from a local perspective based on its own structural characteristics, thereby improving the deformation resistance of the entire frame strip. This allows the frame to better resist external forces during production, transportation and assembly, reducing the adverse effects of deformation on the accuracy of subsequent packaging processes and ensuring the quality stability of the packaged products.

[0036] Second Embodiment

[0037] Please refer to the following: Figure 5 Based on the DFN-3 terminal lead frame provided in the first embodiment of this application, the second embodiment of this application proposes another DFN-3 terminal lead frame. The second embodiment is merely a preferred embodiment of the first embodiment, and the implementation of the second embodiment will not affect the separate implementation of the first embodiment.

[0038] Specifically, the difference in the second embodiment of this application regarding the DFN-3 terminal lead frame is that the DFN-3 terminal lead frame further includes a plurality of positioning holes 6, all of which are formed on the top of the frame body 1.

[0039] The plurality of positioning holes 6 are evenly distributed along the top edge of the frame body 1 and are used for positioning the frame body 1 during processing and assembly.

[0040] The working principle of the DFN-3 terminal lead frame provided by this utility model is as follows:

[0041] During processing and assembly, external positioning pins are inserted into positioning holes 6. The movement of the frame body 1 is restricted by the cooperation between the positioning holes 6 and the positioning pins, so that the frame body 1 maintains the preset position in each process and ensures processing accuracy.

[0042] Compared with related technologies, the DFN-3 terminal lead frame provided by this utility model has the following beneficial effects:

[0043] By setting the positioning hole 6, the problem of inaccurate positioning during the processing of the existing frame is solved, the packaging accuracy is improved, and the product scrap caused by position deviation is reduced.

[0044] Third Embodiment

[0045] Please refer to the following: Figure 6 Based on the DFN-3 terminal lead frame provided in the first embodiment of this application, the third embodiment of this application proposes another DFN-3 terminal lead frame. The third embodiment is merely a preferred embodiment of the first embodiment, and the implementation of the third embodiment will not affect the separate implementation of the first embodiment.

[0046] Specifically, the difference in the third embodiment of this application regarding the DFN-3 terminal lead frame is that the DFN-3 terminal lead frame further includes a plurality of cutting grooves 7, all of which are formed on the inner side of the semi-etched area 4.

[0047] The plurality of cutting grooves 7 are respectively disposed on the sides of the plurality of semi-circular notches 5.

[0048] The working principle of the DFN-3 terminal lead frame provided by this utility model is as follows:

[0049] During the cutting process, the cutting blade cuts along the cutting groove 7, which guides the cutting direction. The semi-circular notch 5 reduces the shear strength of the material at the cutting point, making the cutting process smoother. At the same time, due to stress dispersion, burrs are less likely to be generated on the edge of the product after cutting, and the cutting blade is subjected to more uniform force, extending its service life.

[0050] Compared with related technologies, the DFN-3 terminal lead frame provided by this utility model has the following beneficial effects:

[0051] By combining the cutting groove 7 with the semi-circular notch 5, the problems of burrs and short cutting blade life during existing frame cutting are solved, improving cutting quality and production efficiency, and reducing production costs.

[0052] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A DFN-3 terminal lead frame, characterized in that, include: The frame body comprises multiple unetched areas, multiple semi-etched areas, and multiple reinforcing ribs. The multiple unetched areas, multiple semi-etched areas, and multiple reinforcing ribs are all disposed on the surface of the frame body, and the multiple reinforcing ribs are disposed between the multiple unetched areas and the multiple semi-etched areas.

2. The DFN-3 terminal lead frame according to claim 1, characterized in that, Multiple semi-circular notches are provided on the inner surfaces of the multiple semi-etched areas.

3. The DFN-3 terminal lead frame according to claim 1, characterized in that, All of the aforementioned reinforcing ribs are cross-shaped.

4. A DFN-3 terminal lead frame according to claim 1, characterized in that, It also includes multiple positioning holes, all of which are located on the top of the frame body.

5. A DFN-3 terminal lead frame according to claim 4, characterized in that, The multiple positioning holes are evenly distributed along the top edge of the frame body and are used for positioning the frame body during processing and assembly.

6. A DFN-3 terminal lead frame according to claim 2, characterized in that, It also includes multiple cutting grooves, all of which are formed on the inner side of the semi-etched area.

7. A DFN-3 terminal lead frame according to claim 6, characterized in that, The plurality of cutting grooves are respectively disposed on the sides of the plurality of semi-circular notches.

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