Patent ID: 8723220

Claim:
A semiconductor device comprising: at least one IGBT element region; a diode element region; and a diode electric current detection region configured capable of detecting a diode electric current that flows through the diode element region, wherein the IGBT element region, the diode element region and the diode electric current detection region are formed in one semiconductor substrate, a second conductivity type collector region, a first conductivity type drift region, and a second conductivity type body region are sequentially laminated in the IGBT element region, a first conductivity type cathode region, a first conductivity type drift region, and a second conductivity type body region are sequentially laminated in the diode element region and the diode electric current detection region, the diode electric current detection region is arranged adjacent to the diode element region, the cathode region of the diode element region extends to connect with the cathode region of the diode electric current detection region, the collector region of the IGBT element region is arranged adjacent to the cathode region of the diode element region, and the diode element region is disposed between the diode electric current detection region and the IGBT element region so that the diode electric current detection region is not adjacent to any IGBT element region.