Patent ID: 8143691

Claim:
A semiconductor device comprising: a semiconductor substrate of a first conductive type; a conductive region of a second conductive type above the semiconductor substrate; a body region of the first conductive type within the conductive region of the second conductive type; a buried diffusion region of the first conductive type within the conductive region of the second conductive type, the buried diffusion region being provided between the semiconductor substrate and the body region and in contact with the body region; a source region of the second conductive type and a body contact region of the first conductive type within the body region; a drift region of the second conductive type within the conductive region of the second conductive type, the drift region of the second conductive type being provided separately from the body region; a drain region of the second conductive type within the drift region; and a gate electrode above the body region, the buried diffusion region of the first conductive type extending away from the body region farther than the gate electrode is, along a cross section perpendicular to a source-drain direction.