Patent ID: 7235860

Claim:
An device structure comprising: a first conductivity type substrate; a single transistor comprised of a first buried region, of a second conductivity type, formed within the substrate; a single continuous collector region, of the second conductivity type, formed over only part of the semiconductor substrate and formed entirely over the buried region, a first direction and a second direction being defined, the second direction being orthogonal to the first direction within a plan view of the collector region; an isolation region, of the first conductivity type, formed over part of the substrate and surrounding and defining the collector region in the plan view of the single transistor, a base region, of the first conductivity type, formed in the collector region, a base electrode contact region, located within the base region, comprised of plural divided base electrode contact sub-regions spatially separated from each other, a collector electrode contact region, associated with only the single transistor, located outside the base region and within the collector region, an emitter region, located within the base region, comprising plural divided sub-emitter regions spatially separated from each other, said plural divided sub-emitter regions being spatially separated, at least in the first direction, from the divided base electrode contact sub-regions, said plural divided sub-emitter regions having respective sub-emitter lengths defined in the second direction, wherein, a total sum of said respective sub-emitter lengths corresponds to a predetermined effective emitter length defined in said second direction for an intended emitter current from said emitter region, every alignment of the sub-emitter parts in the second direction is free of base electrode contact sub-regions between the aligned sub-emitter parts, and every alignment, of the base electrode contact sub-regions in the second direction is free of sub-emitter parts between the aligned base electrode contact sub-regions, said plural divided sub-emitter regions are aligned, in a matrix, the base region is comprised of plural spatially separated base sub-regions spaced apart from each other by the collector region, each base sub-region includes exactly one divided base electrode contact sub-region, plural first direction groupings extend in said first direction, the plural first direction groupings are aligned in said second direction, one of said first direction groupings are in each said base sub-region, each of said plural first direction groupings includes said one divided base electrode contact sub-region and exactly two of said plural divided sub-emitter regions, and in each of said plural first direction groupings, said one divided base electrode contact sub-region and one of said plural divided sub-emitter regions are adjacent to each other but spatially separated from each other at a uniform distance.