CN219696398U - High-foot QFN etching die with reinforcing ribs - Google Patents

Abstract

The utility model discloses a high-pin QFN etching mould with reinforcing ribs, which comprises a front etching mould and a back etching mould matched with the front etching mould, wherein the front etching mould comprises a first base island, a first pin connected to the peripheral side of the first base island, a connecting rib connected with the first pin and a seat post connected with the first base island and the connecting rib; the back etching die comprises a second base island, second pins connected to the periphery of the second base island and reinforcing ribs connected to the second pins, the second pins comprise long pins and short pins which are arranged side by side in a staggered mode, and the reinforcing ribs comprise first parts arranged on the long pins and second parts arranged on the connecting ribs. The beneficial effects of the utility model are as follows: the strength of the connecting ribs of the product is increased, the deformation defect generated in the production process is reduced, and the yield of the product is increased; the strength of the product is enhanced, the production can be facilitated, the production efficiency is improved, and the labor cost is reduced.

Description

High-foot QFN etching die with reinforcing ribs

Technical Field

The utility model belongs to the technical field of lead frames, and particularly relates to a high-pin QFN etching die with reinforcing ribs.

Background

The lead frame is a base material of the semiconductor package, is used as a chip carrier of the integrated circuit, realizes the electric connection between the lead-out end of the internal circuit of the chip and the outer lead by means of bonding materials (gold wires, aluminum wires and copper wires), forms a key structural member of an electric loop and plays a role of a bridge connected with an external lead. Its main functions are circuit connection, heat dissipation, mechanical support, etc. The major trend in the current integrated circuits is to have high density, high pin count, thin profile, and small size, and the packaging method is gradually moving from the initial DIP packaging method to SOP, QFP, BGA, CSP, QFN packaging methods.

Etching is a technique in which material is removed using a chemical reaction or physical impact. Etching techniques can be classified into wet etching and dry etching. The method can be used for manufacturing printing embossing plates such as copper plates, zinc plates and the like at the earliest, and is also widely used for processing Weight Reduction (Weight Reduction) instrument panels, nameplates, thin workpieces which are difficult to process by the traditional processing method and the like; the method can be used for processing electronic sheet parts precision etching products in aviation, machinery and chemical industries through continuous improvement and development of process equipment, and particularly is an indispensable technology in the semiconductor manufacturing process.

At present, when etching the etching frame of high pin position, conventional etching frame is smooth for follow-up cutting the muscle, and the connecting rib adopts half etching to design generally, and this kind of design easily causes the deformation of frame in the production process, because the pin position is higher, the restriction of encapsulation size, the pin adopts side by side cross arrangement, and long pin adopts the back half etching, causes bending deformation easily, reduces the yield of product, influences production speed.

Therefore, there is a need to provide a solution to the above-mentioned problems with a stiffener-attached high-pin QFN etching mold.

Disclosure of Invention

The embodiment of the utility model aims to provide a high-pin QFN etching die with reinforcing ribs, which can solve at least one technical problem related to the background technology.

In order to solve the technical problems, the utility model is realized as follows:

the high-pin QFN etching die with the reinforcing ribs comprises a front etching die and a back etching die matched with the front etching die, wherein the front etching die comprises a first base island, a first pin connected to the peripheral side of the first base island, a connecting rib connected with the first pin and a seat post connected with the first base island and the connecting rib; the back etching die comprises a second base island, second pins connected to the periphery of the second base island and reinforcing ribs connected to the second pins, the second pins comprise long pins and short pins which are arranged side by side in a staggered mode, and the reinforcing ribs comprise first parts arranged on the long pins and second parts arranged on the connecting ribs.

Optionally, the first pin includes an inner pin with one end connected with the first base island and an outer pin connected with one end of the inner pin far away from the first base island.

Optionally, the first base island is square with a side length of 8.9mm, a half-etched area is arranged on the first base island, and the depth is 0.07-0.103 mm.

Optionally, the connecting ribs are designed in a half etching way, and the depth is 0.07-0.103 mm.

Optionally, the seat post is of half etching design, and the depth is 0.07-0.103 mm.

Optionally, the second base island is square with a side length of 8.7mm, and a notch with a size of 0.35x0.35mm is designed at the upper left corner.

Optionally, the four sides of the first base island are all provided with the first pins.

Optionally, the second pins are disposed on four sides of the second base island.

The beneficial effects of the utility model are as follows:

1. through adding reinforcing design to the back of connecting muscle and pin, increase the intensity of connecting the muscle of product, reduce the deformation bad that produces in the production process, increase the yield of product.

2. The strength of the product is enhanced, the production can be facilitated, the production efficiency is improved, and the labor cost is reduced.

Drawings

Fig. 1 is a front etching mold structure diagram of a high-pin QFN etching mold with a stiffener provided by the utility model;

fig. 2 is a diagram of a back side etching mold of the high-pin QFN etching mold with the reinforcing ribs provided by the utility model.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

The terms first, second and the like in the description and in the claims, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged, as appropriate, such that embodiments of the present utility model may be implemented in sequences other than those illustrated or described herein, and that the objects identified by "first," "second," etc. are generally of a type, and are not limited to the number of objects, such as the first object may be one or more. Furthermore, in the description and claims, "and/or" means at least one of the connected objects, and the character "/", generally means that the associated object is an "or" relationship.

The high-pin QFN etching mold with the reinforcing ribs provided by the embodiment of the utility model is described in detail below by referring to figures 1 and 2 through specific embodiments and application scenes thereof.

The embodiment of the utility model provides a high-pin QFN etching mold with reinforcing ribs, which comprises a front etching mold 1 and a back etching mold 2 matched with the front etching mold 1, wherein the front etching mold 1 comprises a first base island 12, a first pin 11 connected to the peripheral side of the first base island 12, a connecting rib 13 connected with the first pin 11 and a seat post 14 connected with the first base island 12 and the connecting rib 13.

Specifically, the first base island 12 is square, and four sides of the first base island are provided with the first pins 11.

The back etching mold 2 includes a second land 23, a second lead 21 connected to the peripheral side of the second land 23, and a reinforcing rib 22 connected to the second lead 21.

The second pins 21 include long pins 211 and short pins 212 that are staggered in parallel, and the package size can be made as small as possible by using the staggered in parallel arrangement.

The reinforcing rib 22 includes a first portion 221 disposed on the long pin 211 and a second portion 222 disposed on the connecting rib 13. By providing the reinforcing ribs 22, the strength of the product can be increased

The first lead 11 includes an inner lead 112 having one end connected to the first base 12 and an outer lead 111 connected to an end of the inner lead 112 remote from the first base 12.

In some embodiments, the outer pins 111 are designed in a special angle shape and the inner pins 112 are designed in an arc shape.

Specifically, the first base island 12 is square with a side length of 8.9mm, and is provided with a half-etched area with a depth of 0.07-0.103 mm, so that the plastic package combination property of the product can be improved.

The connecting ribs 13 are designed in a half etching way, and the depth is 0.07-0.103 mm. The seat post 14 is of half-etched design and has a depth of 0.07-0.103 mm.

The second base island 23 is a square with a side length of 8.7mm, and a notch with a size of 0.35x0.35mm is designed at the upper left corner and is used for identifying products after plastic packaging.

Further, the second pins 21 are disposed on four sides of the second base island 23.

The working principle of the high-foot QFN etching die with the reinforcing ribs provided by the utility model is as follows:

the reinforcing rib 22 is divided into the first part 221 arranged on the long pin 211 and the second part 222 arranged on the connecting rib 13 through the back etching die 2, so that the strength of a product is enhanced under the condition that the subsequent rib cutting is not influenced, the connecting rib 13 is not easy to deform due to the existence of the second part 222 during production, the connection pin 11 is more facilitated, the long pin 211 is not easy to bend and deform due to the existence of the first part 221, and the production can be smoother.

In general, the etching mold for the reinforcing ribs provided by the utility model has the advantages that when the existing etching product is produced, the fixed column area is made into a half-etching process due to the requirement of a rib cutting process, so that the strength of the product is weakened, the deformation defects of pins and connecting ribs are easily caused in the reproduction process, the deformation defects of the pins and the connecting ribs can be effectively reduced by properly making a reinforcing process at the connecting ribs, when the high-pin QFN frame is produced, the pins are staggered in double rows, the long pins are easy to bend and deform due to the longer half-etching area, and the reinforcing ribs are added in the middle of the long pins, so that the problem can be effectively solved, the yield of the product is improved, the production cost is reduced, and the production efficiency can be relatively improved due to the strength reinforcement.

The embodiments of the present utility model have been described above with reference to the accompanying drawings, but the present utility model is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those having ordinary skill in the art without departing from the spirit of the present utility model and the scope of the claims, which are to be protected by the present utility model.

Claims (8)

1. The high-pin QFN etching die with the reinforcing ribs is characterized by comprising a front etching die and a back etching die matched with the front etching die, wherein the front etching die comprises a first base island, a first pin connected to the peripheral side of the first base island, a connecting rib connected with the first pin and a seat post connected with the first base island and the connecting rib; the back etching die comprises a second base island, second pins connected to the periphery of the second base island and reinforcing ribs connected to the second pins, the second pins comprise long pins and short pins which are arranged side by side in a staggered mode, and the reinforcing ribs comprise first parts arranged on the long pins and second parts arranged on the connecting ribs.

2. The stiffener-attached high pin QFN etching mold of claim 1, wherein said first pin comprises an inner pin having one end connected to said first island and an outer pin connected to an end of said inner pin remote from said first island.

3. The high-foot QFN etching mold with the reinforcing ribs as set forth in claim 1, wherein the first base island is square with a side length of 8.9mm, and a half-etched area is arranged on the first base island, and the depth is 0.07-0.103 mm.

4. The high-pin QFN etching mold with the reinforcing ribs of claim 1, wherein the connecting ribs are of half etching design and have a depth of 0.07-0.103 mm.

5. The high-pin QFN etching mold with the reinforcing ribs of claim 1, wherein the seat posts are of half-etched design and have a depth of 0.07-0.103 mm.

6. The high-pin QFN etching mold with the reinforcing ribs of claim 1, wherein the second base island is square with a side length of 8.7mm, and a notch with a size of 0.35x0.35mm is designed at the upper left corner.

7. The high-pin QFN etching mold with reinforcement ribs of claim 5, wherein said first pins are provided on four sides of said first island.

8. The high-pin QFN etching mold with reinforcement ribs of claim 6, wherein said second pins are provided on four sides of said second island.