Patent ID: 8952483
Filing Date: 2015-02-10
Classification: H01L

Abstract:
1. A semiconductor device, comprising: a substrate; a first circuit which is formed on the substrate, and in which a power supply potential is set to a first voltage; a diode which is formed on the substrate, and in which a second voltage lower than the first voltage is applied to an anode; and a potential isolation element which is formed on the substrate at a position different from that of the diode when seen in a plan view, and which connects a cathode of the diode to a power supply interconnection of the first circuit, wherein the potential isolation element includes, a first conduction type layer, a second conduction type low-concentration region which is formed over the first conduction type layer, a first second-conduction-type high-concentration region which is positioned in the second conduction type low-concentration region, and which is connected to the cathode of the diode, a second second-conduction-type high-concentration region which is positioned in the second conduction type low-concentration region and is disposed to be spaced from the first second-conduction-type high-concentration region, and which is connected to the power supply interconnection of the first circuit, and a first first-conduction-type region which is formed in the second conduction type low-concentration region, whose bottom portion is connected to the first conduction type layer, to which a ground potential is applied, and which is positioned in the vicinity of the first second-conduction-type high-concentration region.