Patent ID: 7221047

Claim:
A pressure-contact type semiconductor device having a center gate structure which includes an external cathode electrode, an external anode electrode and an external gate terminal for flowing an electric current at a time of turn on/off operation, said semiconductor device comprising: a semiconductor substrate having a center concave step portion at a center portion thereof, said semiconductor substrate having a gate electrode and a cathode electrode formed on a top surface side of the substrate, and an anode electrode formed on a back surface of the substrate; and a pressure-contact supporting block which is provided in an inner periphery of the external gate terminal and located on the gate electrode above the center concave portion of the substrate, wherein the gate electrode is formed on the surface of the center concave step portion of the substrate so as to face the pressure-contact supporting block, wherein a convex contacting portion is formed at a predetermined position of a top surface of the gate electrode so as to contact the pressure-contact supporting block, and wherein an insulation film is formed on a surface area of the gate electrode, excluding a position of forming the convex contacting portion.