Patent ID: 8373231

Claim:
A semiconductor device comprising: an n-type metal oxide semiconductor transistor for electrostatic discharge protection having a multi-finger structure in which a plurality of transistors is integrated, and comprising a plurality of drain regions and a plurality of source regions alternately placed with each other, and a plurality of gate electrodes each placed between each of the plurality of drain regions and each of the plurality of source regions; wherein the plurality of drain regions is electrically connected to an external connection terminal; wherein the plurality of source regions is electrically connected to a ground potential supply line through first metal interconnects disposed above and connected to each of the plurality of source regions, and a second metal interconnect connected to each of the first metal interconnects with via-holes having a constant size and placed on each of the first metal interconnects; and wherein a number of the via-holes placed on the first metal interconnect becomes larger as a distance from the ground potential supply line becomes farther.