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Method for producing silicon avalanche rectifier diode for primary welding automobile

A rectifier diode, welding molding technology, applied in the direction of electrical components, electrical solid devices, semiconductor/solid device manufacturing, etc., can solve the problems of easy falling off of leads and tube cores, decreased reliability, increased thermal resistance, etc., to improve product quality Reliability and adaptability, high equivalent working junction temperature, and fast heat dissipation

Inactive Publication Date: 2010-06-02
ANHUI HUARUI SEMICON TECH CO LTD
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  • Description
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Problems solved by technology

[0008] The advantage of this process method is that the process is simple, the input of production equipment is small, and the organization of production is easy. The disadvantage is that when the solder is in the environment of 210-220 °C for a long time, the crystal lattice becomes thicker, the resistance increases, the thermal resistance increases, and the reliability increases. drop, the lead wire and the die are easy to fall off in actual use

Method used

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  • Method for producing silicon avalanche rectifier diode for primary welding automobile
  • Method for producing silicon avalanche rectifier diode for primary welding automobile
  • Method for producing silicon avalanche rectifier diode for primary welding automobile

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Embodiment Construction

[0023] The production method of the silicon avalanche rectifier diode for motor vehicles of one-time welding formation of the present invention comprises the following steps:

[0024] 1) The lead wire 5, the soldering piece 3, the silicon chip 2, another soldering piece 3 and the base 1 are sequentially combined through one welding to directly make a rectifier diode;

[0025] 2) Pickling the exposed PN junction surface by wet acid etching;

[0026] 3) Use polyimide material to passivate the PN junction surface;

[0027] 4) Encapsulation.

[0028] There are obvious differences in the product structure produced by the primary welding and secondary welding production processes. figure 1 Schematic diagram of the structure of a silicon rectifier diode for motor vehicles produced by the secondary welding process; the diode includes a base 1 on which copper particles 4, silicon chips 2, a second copper particle 4 and split Lead 9.

[0029] figure 2 It is a schematic diagram of ...

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Abstract

The invention discloses a method for manufacturing a silicon avalanche rectifier diode for one-step soldering of a motor vehicle. The method comprises the following steps that (1) an integrated lead wire, a soldering terminal, a silicon slice, another soldering terminal and a pedestal are combined in turn through one-step soldering so as to be directly made into a rectifier diode; (2) the surfaceof an exposed PN junction undergoes acid washing through wet acid corrosion; (3) a polyimide material is used to carry out passivation of the surface of the PN junction; and (4) packaging is carried out. The silicon avalanche rectifier diode has the advantages of high maximum equivalent working junction temperature, excellent high temperature property, quick heat dissipation and simple assembly, and greatly improves both reliability and adaptability of product.

Description

technical field [0001] The invention relates to a production method of a silicon avalanche rectifier diode for a motor vehicle in a rectifier assembly of a motor vehicle generator, in particular to a production method of a silicon avalanche rectifier diode for a motor vehicle formed by one-time welding. Background technique [0002] Silicon avalanche rectifier diodes for motor vehicles are the key components of automobile generators, which convert the alternating current generated by the generator into direct current by combining them into rectification components. Due to its avalanche breakdown characteristics, when the car breaks down, it can absorb the fault voltage and protect the regulator from damage. When the regulator is out of control, it can break down immediately, so that the generator does not generate electricity and acts as a fuse. Function, protect the main controller in the car from damage, and turn vicious accidents into general failures. [0003] The produ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L21/50
CPCH01L2224/01
Inventor 曹榆戴小薇韩平
Owner ANHUI HUARUI SEMICON TECH CO LTD
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