Patent ID: 6621132
Filing Date: 2003-09-16
Classification: H01L

Abstract:
A semiconductor device comprising:a semiconductor chip having a first major surface and a second major surface facing opposite to the first major surface; a first main electrode on the first major surface; a second main electrode on the second major surface; a layer with low electrical resistance on the side of the second major surface; an alternating conductivity type layer between the first major surface and the layer with low electrical resistance, the alternating conductivity type layer including a plurality of first semiconductor regions of a first conductivity type and a plurality of second semiconductor regions of a second conductivity type arranged alternately; a pair of the first semiconductor region and the second semiconductor region being repeated at a first repeating pitch; a plurality of trenches dug from the first major surface; a plurality of gate electrodes buried in each of the trenches with a gate oxide film interposed therebetween, the gate electrodes being arranged repeatedly at a second repeating pitch different from the first repeating pitch; a plurality of well regions of the second conductivity type in contact with the gate oxide films in the side walls of the trenches; and a plurality of source regions of the first conductivity type isolated by the well regions from the first semiconductor regions, the source regions contacting with the gate oxide films in the side walls of the trenches, wherein the second repeating pitch is wider than the first repeating pitch.