Patent ID: 7791131

Claim:
A semiconductor device comprising an MOSFET, including: a source and a drain formed over a portion of the main surface of a semiconductor substrate of a first conductivity type while being spaced apart by a channel formation region, each of said source and drain having a second conductivity type; a gate electrode formed over the channel formation region via a gate insulating film; and a plurality of sinker layers of the first conductivity type which are formed over the other portions of the main surface of the semiconductor substrate, the plurality of sinker layers being electrically connected to the source and to the semiconductor substrate, wherein the source and the drain have plane patterns extending along a first direction of the main surface of the semiconductor substrate, wherein the plurality of sinker layers are arranged along the first direction, and wherein each of the plurality of sinker layers has a plane pattern having a long side in a second direction crossing the first direction wherein the plurality of sinker layers are each comprised of a conductive film embedded inside of a trench made in the semiconductor substrate.