Patent ID: 6891250

Claim:
A semiconductor device with a bipolar transistor comprising: a first conductivity type semiconductor layer serving as a collector region; a base region constituted of a second conductivity type region provided in said first conductivity type semiconductor layer; an emitter region constituted of a first conductivity type region provided in said base region; and a base contact section spaced apart from said emitter region in said base region, electrically connected to a base electrode, wherein said emitter region comprises a plurality of stripe regions and each of said stripe regions is formed so that a plurality of portions of said base region are exposed at the central portion of each of said stripe regions, each of said plurality of portions of said base region is surrounded by a corresponding one of said plurality of stripe regions of said emitter region, and an emitter electrode is formed so as to be connected to said plurality of stripe regions and to cover the exposed portions of said base region via an insulating film, wherein said base contact section is constructed of a repeating structure in a plan view, in which a high impurity concentration region of the second conductivity type and a region of the first conductivity type are arranged in an alternate manner.