Light controllable thyristor

Details Light controllable thyristor Light controllable thyristor

1975-11-14

1977-01-04

James, Andrew J.

357 30, 357 68, 357 86, H01L 2974

Patent

active

040018652

ABSTRACT:
A thyristor which may be controlled by light has a semiconductor body comprising at least four zones of alternating conductivity types. The first zone forms a main emitter, the second zone forms a base having a region which is provided to be exposed to light, and having an auxiliary emitter located between the light region and the main emitter. A second auxiliary emitter is located between the first-mentioned auxiliary emitter and the main emitter. The ratio of the effective edge lengths facing the exposure region, to the second auxiliary emitter and the ratio between the effective edge lengths facing the exposure region of the main emitter on the one hand and the second auxiliary emitter on the other hand are related to one another in such a manner that, prior to the turn-on of the first auxiliary emitter, the second auxiliary emitter and subsequently the main emitter turn on.

REFERENCES:
patent: 3893153 (1975-07-01), Page et al.

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