Patent ID: 6569730
Filing Date: 2003-05-27
Classification: H01L

Abstract:
A high voltage bipolar transistor comprising:a body of silicon of a first conductivity type, having an upper surface; a base region of silicon of a second type, extending a first depth from said upper surface into the body of the first type; first and second heavily doped collector contact regions of the first type, flanking said base region and separated therefrom by shallow isolation trenches, extending a second depth from said upper surface into the silicon body; a heavily doped base contact region of the second type, wholly within the base region, and extending a third depth from said upper surface; a heavily doped emitter region of the first type, wholly within the base region, extending a fourth depth from said upper surface; shallow isolation trenches between the base and first collector contact and between the emitter and second collector contact region; and a heavily doped buried layer of the second type, having a thickness between about 2.5 and 3.5 microns and an upper interface with said body of the first type that is located between about 2.5 and 3 microns below said upper surface, and overlapping the base layer by between about 1.5 and 2.5 microns.