CN211208437U

CN211208437U - TO-247-2L lead frame structure

Info

Publication number: CN211208437U
Application number: CN202020185697.5U
Authority: CN
Inventors: 王飞; 刘晶; 王瑞东; 牛志强
Original assignee: Tianshui Huatian Electronic Group Co ltd
Current assignee: Tianshui Huatian Electronic Group Co ltd
Priority date: 2020-02-19
Filing date: 2020-02-19
Publication date: 2020-08-07
Anticipated expiration: 2030-02-19

Abstract

The utility model discloses a TO-247-2L lead frame structure, this lead frame structure include a plurality of lead frame units, connect through horizontal muscle between two adjacent lead frame units, and horizontal muscle middle part is equipped with the arch, should protruding and the integrative stamping forming of whole lead frame the utility model discloses a TO-247-2L lead frame structure can directly adopt the plastic envelope mould and the muscle cutting mould of TO-247-3L lead frame TO carry out plastic envelope and muscle cutting operation, and the muscle cutting in-process can be with protruding excision, therefore its encapsulation appearance and function and current TO-247-2L lead frame unit are identical completely, the utility model discloses reduced lead frame production line mould and changed the frequency, improved the utilization ratio and the production efficiency of production line equipment.

Description

TO-247-2L lead frame structure

Technical Field

The utility model belongs TO the technical field of the semiconductor package, a TO-247-2L lead frame structure is related TO.

Background

The lead frame is used as a chip carrier of an integrated circuit, is a key structural member for realizing the electrical connection between a leading-out end of an internal circuit of a chip and an external lead by means of a bonding copper wire so as to form an electrical circuit, and plays a role of a bridge connected with an external lead. Most of the semiconductor integrated packages require lead frames, which are important basic materials in the electronic information industry. The product types comprise TO, DIP, ZIP, SIP, SOP, SSOP, QFP (QFJ), SOD, SOT and the like, and are mainly produced by a die stamping method.

The TO-247-3L is widely used as a lead frame in the TO type due TO the characteristics of good heat dissipation performance and high stability, but in the practical use process, the TO-247-3L lead frame is found TO have short circuit phenomenon because the lead frame has small lead spacing, and when the lead frame is welded on a circuit board for use, if arc discharge occurs between pins, the pins which are originally insulated from each other are easy TO creep along the surface of the circuit board, and the lead spacing is increased on the basis of the TO-247-3L lead frame in the TO-247-2L lead frame, so that the problems are well solved.

In actual production, for manufacturers who have purchased all devices of the TO-247-3L production line, if the TO-247-2L lead frame adopts a special plastic packaging and rib cutting die during plastic packaging and rib cutting, the burden of frequent die change of the lead frame production line is increased, and the utilization rate and the production efficiency of the production line devices are reduced.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a TO-247-2L lead frame structure, but this structure sharing TO-247-3L plastic envelope and muscle cutting mould are provided in order TO overcome when adopting TO-247-3L production line production current TO-247-2L lead frame, need TO change dedicated plastic envelope and muscle cutting mould, lead TO TO-247-3L production line equipment utilization and production efficiency low defect.

The utility model adopts the following technical scheme:

a TO-247-2L lead frame structure comprises a plurality of lead frame units connected in parallel, wherein two adjacent lead frame units are connected through a first transverse rib;

the lead frame unit comprises a carrier, wherein both sides of the carrier are provided with glue locking grooves, a positioning hole is formed in a heat dissipation area at one end of the carrier, and both sides of the heat dissipation area are provided with tin locking grooves; two pins are arranged in the pin area at the other end of the carrier, the bottom of each pin is provided with a pin, and a lead is arranged in each pin and the pin in a penetrating way;

two connect through the horizontal muscle of second between the pin, the horizontal muscle middle part of second is equipped with the arch.

Preferably, the width of the protrusion is consistent with the width of a notch on the TO-247-3L lead frame plastic package mold.

Preferably, the bottoms of the pin areas are connected through a third transverse rib, and a positioning hole is formed in the third transverse rib; the first horizontal rib is connected with the second horizontal rib and the third horizontal rib.

Preferably, a strip-shaped groove is formed between the first transverse rib and the pin; a rectangular groove is formed between the two pins.

Preferably, the protrusion is integrally press-molded with the lead frame unit.

The utility model discloses following beneficial effect has:

the utility model discloses a TO-247-2L lead frame structure connects through horizontal muscle between two adjacent lead frame units, and horizontal muscle middle part is equipped with the arch TO-247-2L lead frame structure can directly adopt the plastic envelope mould and the muscle cutting mould of TO-247-3L lead frame TO carry out the plastic envelope and the operation of cutting the muscle, has reduced lead frame production line mould and has changed the frequency, has improved the utilization ratio and the production efficiency of production line equipment.

Drawings

FIG. 1 is a TO-247-2L leadframe structure of the present invention comprising 10 leadframe units;

FIG. 2 is a schematic structural diagram of the lead frame unit of FIG. 1;

FIG. 3 is a schematic diagram of a prior art TO-247-2L lead frame;

FIG. 4 is a schematic diagram of a prior art TO-247-3L lead frame;

reference numerals: 1. locking the tin bath; 2. positioning holes; 3. a glue locking groove; 4. a carrier; 5. a lead wire; 6. a first transverse bar; 7. a pin; 8. a pin; 9. and (4) protruding.

Detailed Description

In order to make the technical solutions in the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall fall within the protection scope of the present invention.

It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a single embodiment.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

The present invention will be described in detail with reference to the accompanying drawings.

As shown in figure 1, the utility model discloses a TO-247-2L lead frame structure that can share TO-247-3L plastic envelope and muscle cutting mould, including 10 lead frame units as shown in figure 2, connect through first horizontal muscle 6 between two adjacent lead frame units, every lead frame unit includes carrier 4, and carrier 4 both sides all are equipped with the lock gluey groove 3, and carrier 4 one end is equipped with locating hole 2, and locating hole 2 both sides are equipped with tin locking groove 1, and carrier 4 lower part is equipped with two pins 7, and pin 7 bottom is pin 8, wears TO establish lead wire 5 in pin 7 and the pin 8.

Two connect through the horizontal muscle of second between the pin 8, the horizontal muscle middle part of second is equipped with arch 9. The bump 9 is integrally press-molded with the entire lead frame.

The width of the bump 9 is consistent with the width of a notch on the TO-247-3L lead frame plastic package mold, and the bump is of a rectangular structure.

The bottoms of the pin areas are connected through a third transverse rib, and a positioning hole is formed in the third transverse rib; the first transverse bar 6 is connected with the second transverse bar and the third transverse bar.

A strip-shaped groove is arranged between the first transverse rib 6 and the pin 8; a rectangular slot is formed between the two pins 8.

The utility model discloses TO-247-2L lead frame structure's processing method does:

when in plastic package, the TO-247-2L lead frame of the utility model can directly adopt a plastic package mould of the TO-247-3L lead frame;

after plastic package is finished, a bar cutting die of the TO-247-3L lead frame shown in the figure 4 is used for cutting bars, and the protrusions 9 are cut off in the bar cutting process, so that the package shape and the function of the TO-247-2L lead frame unit are completely consistent with those of the existing TO-247-2L lead frame shown in the figure 3.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims

1. The TO-247-2L lead frame structure is characterized by comprising a plurality of lead frame units connected in parallel, wherein two adjacent lead frame units are connected through a first transverse rib (6);

the lead frame unit comprises a carrier (4), both sides of the carrier (4) are provided with glue locking grooves (3), a positioning hole (2) is arranged in a heat dissipation area at one end of the carrier (4), and both sides of the heat dissipation area are provided with tin locking grooves (1); two pins (7) are arranged in a pin area at the other end of the carrier (4), pins (8) are arranged at the bottoms of the pins (7), and the pins (7) and the pins (8) are internally provided with leads (5) in a penetrating manner;

two connect through the horizontal muscle of second between pin (8), the horizontal muscle middle part of second is equipped with arch (9).

2. The TO-247-2L lead frame structure of claim 1, wherein the width of the bump (9) is consistent with the width of the notch on the TO-247-3L lead frame plastic mold.

3. A TO-247-2L lead frame structure as claimed in claim 1, wherein the bottom of the lead area is connected by a third transverse rib, the third transverse rib is provided with a positioning hole, and the first transverse rib (6) is connected with the second transverse rib and the third transverse rib.

4. A TO-247-2L lead frame structure as claimed in claim 1, wherein a strip-shaped groove is arranged between the first transverse rib (6) and the lead (8), and a rectangular groove is formed between the two leads (8).

5. A TO-247-2L lead frame structure according TO claim 1, characterized in that the bumps (9) are stamped and formed integrally with the lead frame unit.