Patent ID: 8604514

Claim:
A bipolar semiconductor device comprising: a main cell region consisting of a trench gate type element region; and a sense cell region including a planar gate type element region, wherein the trench gate type element region comprises: a first conductivity type collector region, a second conductivity type drift region laminated on the collector region, a first conductivity type body region laminated on the drift region, a second conductivity type emitter region formed on an upper surface side of the body region, and a trench gate type insulation gate extending while penetrating the body region and the emitter region; and the planar gate type element region comprises: a first conductivity type collector region, a second conductivity type drift region laminated on the collector region, a second conductivity type emitter region formed on an upper surface side of the drift region, a first conductivity type body region which separates the emitter region from the drift region, and a planar gate type insulation gate opposing an area of the body region that separates the emitter region and the drift region, a part of the emitter region adjacent to the area of the body region and a part of drift region adjacent to the area of the body region, wherein a second conductivity type carrier accumulation region is formed only in the planar gate type element region of the sense cell region, and the carrier accumulation region is formed at a position of the drift region that is opposing the planar gate type insulation gate and is at a depth between the planar gate type insulation gate and the collector region.