Patent ID: 7999324

Claim:
A semiconductor device comprising: a semiconductor substrate including an element region and an element isolation region surrounding the element region; a source region formed in the element region having a first width in a first direction, wherein the first direction is a gate width direction; a first drain region formed in the element region and apart from the source region in a second direction which is perpendicular to the first direction, the first drain region having a second width in the first direction, wherein the first width is equal in magnitude to the second width; a second drain region formed in the element region and apart from the first drain region in the second direction, the second drain region having a third width in the first direction, wherein the third width is equal in magnitude to the second width and the first drain region is located between the source region and the second drain region; a third drain region formed in the element region between the first drain region and the second drain region, the third drain region having an electrical resistivity higher than that of the source, first drain, and second drain regions, the third drain region having a fourth width in the first direction, wherein the magnitude of the fourth width is smaller than that of the first width; a gate insulating film formed on the element region between the source region and the first drain region; a gate electrode formed on the gate insulating film; and a silicide layer formed on and entirely covering each of the source, first drain and second drain regions, without covering the third drain region; wherein the semiconductor substrate has a first conductivity type, the source, first drain, second drain and third drain regions have a second conductivity type different from the first conductivity type, the source, first drain and second drain regions are equal in impurity concentration, and the third drain region has an impurity concentration lower than that of the source, first drain and second drain regions, wherein the third drain region has two ends along the first direction; and an element isolation region extends to a region between and in contact with the first and second drain regions at and in contact with each of the two ends of the third drain region.