Patent ID: 8450815

Claim:
A high voltage transistor, comprising: drift regions each formed to have a sufficient depth into a substrate so as to be capable of withstanding a high voltage under which the high voltage transistor operates; an isolation layer having a depth greater than a depth of the drift regions, two of the drift regions being formed on opposing sides of the isolation layer and being isolated by the isolation layer; a gate electrode formed over the substrate; a first source region and a first drain region of the transistor formed respectively in the two drift regions formed on the opposing sides of the isolation layer; a second source region or a second drain region formed in one of the drift regions formed on an opposite side of the gate electrode from the isolation layer; and spacers formed about the gate electrode and contacting two of the drift regions formed on opposing sides of the gate electrode, wherein the two drift regions formed on the opposing sides of the isolation layer and the drift region formed on the opposite side of the gate electrode from the isolation layer have a same conductivity type.