Patent ID: 7737523

Claim:
A semiconductor device comprising: first and second anode diffusion layers of a first conductivity type formed in a semiconductor layer of a second conductivity type, wherein the first and second anode diffusion layers are isolated from each other; a cathode diffusion layer of the second conductivity type formed in the semiconductor layer; a third anode diffusion layer of the first conductivity type formed in the semiconductor layer, connected to the second anode diffusion layer, and extended to the cathode diffusion layer: an insulation layer formed on a top surface of the semiconductor layer; and an anode electrode connected to the first and second anode diffusion layers through a contact hole formed in the insulation layer, and forming a Schottky junction with the semiconductor layer between the first anode diffusion layer and the second anode diffusion layer, wherein the second anode diffusion layer is placed surrounding the first anode diffusion layer, an end portion of the anode electrode is formed at an upper portion of the second anode diffusion layer, the third anode diffusion layer is extended toward the cathode diffusion layer more than the second anode diffusion layer, and an impurity concentration of the third anode diffusion layer is lower than that of the second anode diffusion layer.