Patent ID: 6614077
Filing Date: 2003-09-02
Classification: H01L

Abstract:
A semiconductor device comprising:an active layer of a first conductivity type; a base layer of a second conductivity type formed in a surface area of the active layer; a source layer of the first conductivity type formed in a surface area of the base layer; a drain layer of the first conductivity type formed in the surface area of the active layer at a distance from the base layer; an anode layer of the second conductivity type formed adjacent to the drain layer between the base layer and the drain layer; a gate layer formed between the source layer and the drain layer and on the base layer with a gate insulation film interposed therebetween; a source electrode formed on a surface of the base layer and that of the source layer; and a drain electrode formed on a surface of the drain layer and that of the anode layer, wherein the anode layer constitutes a parasitic thyristor, together with the source layer, the base layer, and the active layer, when ESD occurs, and wherein the anode layer is formed only in almost central part of the drain layer so as to extend in a longitudinal direction of the drain layer.