Patent ID: 7872327

Claim:
A semiconductor device comprising: an insulating film formed over a semiconductor substrate, a fuse portion which comprises a metal layer that is formed on said insulating film, a metal plug formed in said insulating film so as to connect with a bottom portion of said fuse portion, a guard band which comprises a conductive layer so as to surround the periphery of said fuse portion, an insulating protective film formed on said fuse portion, and a lead wiring layer electrically connected to the fuse portion through said metal plug, wherein said guard band is separated from said fuse portion by a predetermined distance, said insulating protective film has a recess on a first region, without any overlapping with said metal plug, inside a second region where said metal plug is formed in said fuse portion, and the first region of said recess is thinner than the second region where said metal plug is formed, and said guard band includes a layer which is positioned in the same layer as the lead wiring layer, and partially separated from the lead wiring layer in a portion crossing the lead wiring layer, so as not to be electrically connected to the lead wiring layer.