Patent ID: 8217491

Claim:
A semiconductor device comprising: a base insulating film formed on a semiconductor substrate; a silicon fuse formed on the base insulating film; two silicon wiring patterns formed on the base insulating film, each of the two silicon wiring patterns being connected to either end of the silicon fuse; a silicon guard ring formed on the base insulating film so as to surround the silicon fuse, the silicon guard ring having silicon cutout parts such that the silicon guard ring does not contact the two silicon wiring patterns; an interlayer insulating film formed on the base insulating film so as to cover the silicon fuse, the two silicon wiring patterns, and the silicon guard ring; a first via guard ring made of metal that is implanted into a first via hole formed in the interlayer insulating film and on the silicon guard ring so as to surround the silicon fuse as viewed from the top, the first via guard ring having via cutout parts at positions above the silicon cutout parts; a metal wiring guard ring having a ring shape and made of metal formed on the first via guard ring and the interlayer insulating film so as to surround the silicon fuse as viewed from the top; a silicon nitride film formed on the interlayer insulating film so as to cover the metal wiring guard ring; a final protection film made of a final insulating film formed on the silicon nitride film; and a fuse opening provided by forming a thin part in insulating films of the semiconductor device, the thin part being formed above the silicon fuse and inside guard rings of the semiconductor device, the insulating films including at least one of the interlayer insulating film, the silicon nitride film, and the final protection film, and the guard rings including the silicon guard ring, the first via guard ring, and the metal wiring guard ring.