Method of forming four layer overvoltage protection device

Details Method of forming four layer overvoltage protection device Method of forming four layer overvoltage protection device

1995-05-24

1996-05-14

Chaudhuri, Olik

Fishing, trapping, and vermin destroying

437 31, 437170, 437904, H01L 4900

Patent

active

055167055

ABSTRACT:
An overvoltage protection device having multiple shorting dots in the emitter region and multiple buried regions substantially aligned with these shorting dots. The placement, number, and area of these buried regions reduce and more accurately set the overshoot voltage value of the device while maintaining the high surge capacities of the device. Further, doping types and concentrations have been modified from that known in the prior art to reduce overshoot providing a more accurate and sensitive overvoltage protection device than that known previously in the prior art.

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