Patent ID: 7095651

Claim:
A semiconductor device comprising: a logic circuit having MOS transistors; and a non-volatile semiconductor memory device connected to the logic circuit, wherein the non-volatile semiconductor memory device includes: a selection transistor comprising a first MOS transistor having a gate electrode; a source line connected to one end of the selection transistor; a word line connected to the gate electrode of the selection transistor; a cell transistor having a floating gate electrode, one end of the cell transistor being connected to the other end of the selection transistor, the cell transistor comprising a second MOS transistor; and a bit line connected to the other end of the cell transistor, and wherein each of a gate electrode of the MOS transistors, the gate electrode of the first MOS transistor and the floating gate electrode of the cell transistor are made of the same conductive material, and each of the gate electrode of the MOS transistors, the gate electrode of the first MOS transistor and the floating gate electrode of the cell transistor have the same thickness.