Patent ID: 8102025

Claim:
A semiconductor device comprising: a semiconductor substrate having a first conductive type and first and second surfaces; an IGBT region having an IGBT and disposed in the substrate; a diode region having a diode and disposed in the substrate; and a periphery region disposed in the substrate, wherein the IGBT region includes: a first semiconductor region having a second conductive type and disposed in a surface portion of the first surface of the substrate, the first semiconductor region providing a channel-forming region of the IGBT; and a second semiconductor region having the second conductive type and disposed in a surface portion of the second surface of the substrate, the second semiconductor region facing the first semiconductor region and providing a collector of the IGBT, the diode region includes: a third semiconductor region having the second conductive type and disposed in a surface portion of the first surface of the substrate, the third semiconductor region providing one of an anode and a cathode of the diode; and a fourth semiconductor region having the first conductive type and disposed in a surface portion of the second surface of the substrate, the fourth semiconductor region facing the third semiconductor region and providing the other one of the anode and the cathode of the diode, the periphery region includes: a fifth semiconductor region having the second conductive type and disposed in a surface portion of the first surface of the substrate; and a sixth semiconductor region having the second conductive type and disposed in a surface portion of the second surface of the substrate, the sixth semiconductor region facing the fifth semiconductor region, the first, third and fifth semiconductor regions are commonly and electrically coupled with one another, the second, fourth and sixth semiconductor regions are commonly and electrically coupled with one another, the IGBT region is separated from the diode region, the second semiconductor region covers a whole of the second surface in the IGBT region, the fourth semiconductor region covers a whole of the second surface in the diode region, the fifth semiconductor region has a projection area projected onto the second surface, an outline of the projection area being coincident with or covered with the sixth semiconductor region, the second semiconductor region does not abut the sixth semiconductor region, and the sixth semiconductor region is disposed on a whole of the second surface of the substrate other than the surface portion of the second semiconductor region and the surface portion of the fourth semiconductor region.