Patent ID: 7385250

Claim:
A semiconductor device, comprising; a semiconductor substrate; a back electrode arranged on the back of said semiconductor substrate; a semiconductor portion including first semiconductor layers of a first conduction type and second semiconductor layers of a second conduction type alternately arranged on the surface of said semiconductor substrate to form a striped shape; a main region formed to arrange a main cell therein, said main cell including a gate electrode, a well of the second conduction type formed on said second semiconductor layer, and a source/emitter layer of the first conduction type formed in said well; a sense region formed to arrange a current sense cell therein, said current sense cell including a sense gate electrode, a sense well of the second conduction type formed on said second semiconductor layer, and a sense source/emitter layer of the first conduction type formed in said sense well; a first top electrode arranged above the surface of said semiconductor substrate and connected to said well and said source/emitter layer; a second top electrode arranged above the surface of said semiconductor substrate and connected to said sense well and said sense source/emitter layer; and a ring layer of the second conduction type located on said semiconductor portion, surrounding said main region and said sense region, and connected to said first top electrode.