Two-way semiconductor switch

Details Two-way semiconductor switch Two-way semiconductor switch

1974-10-11

1976-06-15

James, Andrew J.

357 38, 357 86, H01L 29747

Patent

active

039640914

ABSTRACT:
A two-way semiconductor switch, commonly known as a Triac comprises a semiconductor body having at least five superposed zones alternating in conductivity types, the three inner zones forming the basic interior structure and the outer zones, each of different conductivity types, located at the opposite end faces of the semiconductor body forming the emitter or anode boundary zones respectively, and having a main electrode in ohmic contact therewith. One end face also includes first and second control zones of different conductivity types spaced laterally from the outer zones of different conductivity types at that end and in ohmic contact with a control electrode common to both control zones. The penetration depth of the second control zone and/or the penetration depth of the outer zone at the opposite end face of the semiconductor body structure having the same type of conductivity as the second control zone are made greater than the penetration depth of the outer zone of the same type of conductivity at the end face at which the second control zone is located, and a greater emitter short-circuit density is provided at the main electrode in contact with the opposite end face than at the other main electrode, in order to maintain commutation stability.

REFERENCES:
patent: 3360696 (1967-12-01), Neilson et al.
patent: 3475666 (1969-10-01), Hutson
patent: 3731162 (1973-05-01), Suenaga et al.
patent: 3858236 (1974-12-01), Schafer et al.

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