Patent ID: 6940132
Filing Date: 2005-09-06
Classification: H01L

Abstract:
1. A semiconductor device comprising: a first-conductivity-type semiconductor substrate having a first major surface and a second major surface opposing the first major surface; a second-conductivity-type source layer formed in a surface in the semiconductor substrate on a first major surface side; a second-conductivity-type drain layer formed in the surface in the semiconductor substrate on the first major surface side to oppose the source layer with a predetermined interval; a gate insulating film formed on the first major surface of the semiconductor substrate; a gate layer formed on the gate insulating film between the source layer and the drain layer; a source electrode formed on the first major surface of the semiconductor substrate and electrically connected to the source layer; a drain electrode formed on the first major surface of the semiconductor substrate, electrically connected to the drain layer, and having a second isolation portion; a gate electrode formed on the first major surface of the semiconductor substrate, electrically connected to the gate layer, and having a first isolation portion; a first capacitance adjusting electrode formed on the gate insulating film, having a first capacitance adjusted by the first isolation portion, and electrically connected to the gate electrode; and a second capacitance adjusting electrode formed on the gate insulating film, having a second capacitance adjusted by the second isolation portion, and electrically connected to the drain electrode.