Patent ID: 8681527

Claim:
A semiconductor device having a plurality of metal wiring layers, the semiconductor device comprising: a fuse which is formed using a first copper wire in a metal wiring layer upper than a lowermost metal wiring layer of the metal wiring layers and which stores a data signal by being melted or not; a dummy fuse provided adjacent to the fuse and formed using a second copper wire in the same metal wiring layer as that of the fuse; and a diffusion protective wall which is formed using the metal wiring layers so as to surround the fuse and the dummy fuse and which prevents diffusion of copper, wherein each wiring width of the fuse and the dummy fuse is set to a minimum line width in a region surrounded by the diffusion protective wall, and wherein an interval between the fuse and the dummy fuse is set to the minimum interval in the region surrounded by the diffusion protective wall.