Patent
1986-09-12
1988-10-18
James, Andrew J.
357 30, 357 35, 357 36, 357 51, 357 52, 357 59, H01L 2974
Patent
active
047791268
ABSTRACT:
An optically triggered lateral thyristor consists of a plurality of individual lateral thyristor elements connected in parallel. Each element has an active base region which contains a respective cathode region. Each of the base regions is carried in a common conductivity type body. Extending fingers of a continuous anode electrode partly enclose each individual base region to enable the parallel connection of the individual devices. The thyristor base and emitter zones are surrounded by an auxiliary P region which is resistively connected to a field plate and the cathode electrode to improve emitter collection efficiency. The cathode electrode and anode electrode are interdigitated. The cathode electrode is connected to spaced, parallel, generally rectangular emitter regions which are disposed in respective bases between loops of the cathode electrode. Radiation applied to the surface of the device by a noncritical photo source produces the effect of a gate current in order to turn on the device. A resistor, zener diode, capacitor and a plurality of parallel connected MOSFETs are integrated into the chip to define a control circuit for controlling the turn-on of the main lateral thyristor. The anode region may be relatively heavily doped to reduce forward drop. The emitter region surface may be relatively lightly doped to improve injection efficiency of the emitter.
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International Rectifier Corporation
James Andrew J.
Mintel William A.
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