Patent ID: 7427796

Claim:
A semiconductor device, comprising: a first transistor including: a first source layer and a first drain layer both formed in a surface of a semiconductor substrate; a first silicide layer formed on the first source layer and the first drain layer; a first gate electrode formed on a first gate insulating film, which is formed on the surface of the semiconductor substrate and has a second silicide layer; and a silicon nitride film formed on sidewalls of the first gate electrode; a second transistor including: a second source layer and a second drain layer both formed in the surface of the semiconductor substrate; a third silicide layer formed on the second source layer and the second drain layer and equal in thickness to the first silicide layer; a second gate electrode formed on second gate insulating film, which is formed on the surface of the semiconductor substrate and has a fourth silicide layer thinner in thickness than the second silicide layer, wherein the second silicide layer reaches to the first gate insulating film and is made of a same material as the fourth silicide layer.