Patent ID: 8536655
Filing Date: 2013-09-17
Classification: H01L

Abstract:
1. A semiconductor device comprising: a semiconductor substrate of a first conductivity type; a power element formed in one surface of said semiconductor substrate and supplying electric power to a connected load; a circuit element formed in said one surface of said semiconductor substrate in which said power element is formed, and including at least one MOS transistor having a source-drain region of the first conductivity type; a first semiconductor layer of a second conductivity type formed in said one surface of said semiconductor substrate in which said power element is formed, and arranged independently of said power element and said circuit element; and an external circuit electrically connected to said semiconductor substrate and said first semiconductor layer, said external circuit including a first power supply, a first resistive element having one end connected to said first power supply, and a first diode having an anode electrode connected to the other end of said first resistive element and a cathode electrode connected to a ground, and said first semiconductor layer being connected to said other end of said first resistive element.