Patent ID: 6069399
Filing Date: 2000-05-30
Classification: H01L

Abstract:
A vertical bipolar semiconductor power transistor with an interdigitized geometry, comprising:a semiconductor material body with a first conductivity type and a first doping level, and having a main surface;a base buried region with a second conductivity type and a second doping level, the base buried region being embedded in the semiconductor material body;a sinker base region with the second conductivity type, the sinker base region extending from the main surface to the base buried region and delimiting, laterally and downwards, together with the base buried region, one or more emitter finger regions in the semiconductor material body;an emitter buried region with the first conductivity type and a third doping level, which is higher than the first doping level, the emitter buried region being embedded in the semiconductor material body in a position adjacent to the base buried region, being between the base buried region and the main surface, being located inside the emitter finger regions, and having a length in a lateral direction parallel to the main surface;a sinker emitter region with the first conductivity type and a fourth doping level, which is higher than the first doping level, which extends from the main surface to the emitter buried region, inside the emitter finger regions, the sinker emitter region having a width in the lateral direction that is much less than the length of the emitter buried region such that current flows through the emitter buried region in the lateral direction to the sinker emitter region; andwherein said emitter buried region and said sinker emitter region, in each of the finger regions, form a pair of sections which are spaced from one another and delimit between one another a central region of the semiconductor material body.