Method of forming four layer overvoltage protection device
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United States of America Patent
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May 14, 1996
Issued Date -
N/A
app pub date -
May 24, 1995
filing date -
Sep 10, 1993
priority date (Note) -
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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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