Patent ID: 7750409

Claim:
A semiconductor device comprising: an n-type metal oxide semiconductor transistor for electrostatic discharge protection having a structure in which a plurality of transistors is integrated, and comprising a plurality of drain regions electrically connected to an external connection terminal, a plurality of source regions electrically connected to a ground potential supply line 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 are connected with a first metal interconnect, and the plurality of source regions are connected with another first metal interconnect, at least one of the first metal interconnect and the another first metal interconnect being connected to a plurality of layers of metal interconnects other than the first metal interconnect and the another first metal interconnect; and wherein the plurality of source regions include via-holes for electrically connecting the another first metal interconnect and the plurality of layers of metal interconnects other than the first metal interconnect and the another first metal interconnect, a greater number of the via-holes being formed as a distance of an interconnect connected to the n-type metal oxide semiconductor transistor for electrostatic discharge protection from outside becomes larger.