Patent ID: 7910409

Claim:
A method of forming a bi-directional transistor comprising: providing a semiconductor substrate of a first conductivity type; forming a first doped region of a second conductivity type on a surface of the semiconductor substrate as a body region of a first transistor; forming a second doped region of the first conductivity type within the first doped region and extending a first distance into the first doped region as a first current carrying electrode region of the first transistor; forming a third doped region of the first conductivity type extending from the second doped region a second distance into the first doped region; forming a fourth doped region of the second conductivity type on the surface of the semiconductor substrate; and forming a second transistor in the fourth doped region and coupling the second transistor in a parallel path with the first transistor; and forming a third transistor of the bi-directional transistor wherein the third transistor is configured to selectively couple the body region of the first transistor to the semiconductor substrate.