Patent ID: 8063418

Claim:
A semiconductor device comprising: a high-voltage semiconductor switching element controlled by a gate voltage applied to a gate electrode; and a current detection unit including a detection resistor for detecting part of current flowing through the high-voltage semiconductor switching element, wherein: the high-voltage semiconductor switching element includes: a base region of a second conductivity type formed in a semiconductor substrate of a first conductivity type; a first emitter/source region of the first conductivity type formed in the base region; a first base contact region of the second conductivity type formed in the base region, and adjacent to the first emitter/source region; a collector region of the second conductivity type formed in the semiconductor substrate so as to be spaced apart from the base region; a drain region of the first conductivity type formed in the semiconductor substrate so as to be spaced apart from the base region; a gate insulating film formed at least on a part of the base region located closer to the collector region with respect to the first emitter/source region; a gate electrode formed on the gate insulating film; a collector/drain electrode formed above the semiconductor substrate and electrically connected with the collector region and the drain region; and an emitter/source electrode formed above the semiconductor substrate and electrically connected with the first base contact region and the first emitter/source region, a second emitter/source region of the first conductivity type spaced apart from the first emitter/source region, and a second base contact region of the second conductivity type adjacent to the second emitter/source region are formed in the base region, the second emitter/source region is electrically connected to the first emitter/source region through the detection resistor, and the second base contact region is directly connected to the emitter source electrode.