Thyristor or triac with emitter shorting stripes

Details Thyristor or triac with emitter shorting stripes Thyristor or triac with emitter shorting stripes

Filed on

1988-07-01

Date issued

1990-02-20

Examiner

Limanek, Robert P.

Other Related Categories

357 39, 357 86, H01L 2974, H01L 29747

Type

Patent

Status

active

Patent number

049031058

Description

ABSTRACT:
The instant invention relates to thyristors and triacs. In order to desensitize thyristors and triacs, it is usual to provide for emitter shorts through which the gate region crosses the emitter region. Those holes are generally scattered on the whole surface of the emitter region. According to the instant invention, they are grouped in the form of narrow stripes such as the stripes 30 and 32 shown in the figure. It is to be appreciated that a substantial improvement of the triggering uniformity is achieved fror thyristors and triacs, and, for triacs, an improvement from the ON to the OFF state is achieved thanks to a better extraction of the charges stored during the conduction phase.

REFERENCES:
patent: 3792320 (1974-02-01), Hutson
patent: 4641175 (1987-02-01), Shiraishi
patent: 4812893 (1986-07-01), Bacuvier

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