Patent ID: 9666700
Date: 2017-05-30
CPC Classifications: H01L

Claim:
1. A vertical bipolar junction transistor comprising: a highly doped emitter region having a first conductivity type disposed on a semiconductor substrate; a pair of highly doped collector regions, having the first conductivity type, symmetrically disposed on the semiconductor substrate with respect to the emitter region; a pair of highly doped base regions, having a second conductivity type opposite to the first conductivity type, symmetrically disposed with respect to the emitter region, each base region being disposed between the emitter region and one of the collector regions; a drift region having a first doping concentration surrounding the emitter region and being deeper than either the base region or the collector region, the drift region having the first conductivity type; a base layer, having the second conductivity type, disposed below the drift region; and a collector layer in contact with the base layer, the collector layer having a second doping concentration higher than the first doping concentration, the collector layer having the first conductivity type; wherein a field oxide layer defining an isolation layer is disposed between the emitter, collector, and base regions, and wherein the isolation layer is deeper than either the base region or the collector region.