Patent ID: 9508641
Filing Date: 2016-11-29
CPC Classification: H01H,H01L

Claim Text:
1. A semiconductor device, comprising: a semiconductor substrate; a transistor formed on a main surface of the semiconductor substrate; a first insulator layer formed over the transistor; a first trench formed in the first insulator layer; a first wiring comprised of a first metal and formed in the first trench, a second insulator layer formed over the first wiring; a second trench formed in the second insulator layer; a second wiring formed in the second trench, an electric fuse formed of the same layer as that of the first wiring; a third insulator layer formed over the second insulator layer; a third wiring formed over the third insulator layer, and a metal cap film formed to cover an entire upper surface of the first wiring, including an entire upper surface of the electric fuse, the metal cap film being comprised of a metal having a higher electric resistance than the first metal, wherein a first thickness of the first wiring and the electric fuse is thinner than a second thickness of the second wiring, and wherein a dielectric relative constant of each of the first insulator layer and the second insulator layer is 3 or less.