Patent ID: 7326996

Claim:
A semiconductor device, comprising: a semiconductor substrate of a first conductivity type, having upper and lower surfaces; a collector region of a second conductivity type on the lower surface of said semiconductor substrate; a collector electrode on said collector region; at least one pair of isolation regions of the second conductivity type extending from the upper surface of said semiconductor substrate to said collector layer for defining a drift region of the first conductivity type, in conjunction with said collector region; a base region of the second conductivity type formed adjacent the upper surface of said semiconductor substrate and within the drift region; an emitter region of the first conductivity type, formed adjacent the upper surface of said semiconductor substrate and within said base region; a gate electrode opposing to said base region via an insulating layer; and an emitter electrode formed on said emitter region; wherein said collector region has thickness in the range between 17 μm to 50 μm.