Patent ID: 7602022

Claim:
A vertical surge voltage protection diode integrated with a horizontal device in a semiconductor substrate, comprising: a semiconductor region of a first conductivity type having low resistivity; a semiconductor region of the first conductivity type having medium resistivity; a semiconductor region of the first conductivity type having high resistivity; a semiconductor region of a second conductivity type having low resistivity provided on a surface of the semiconductor region of the first conductivity type having high resistivity; a semiconductor region of the second conductivity type having high resistivity covering the semiconductor region of the second conductivity type having low resistivity and extending to the semiconductor region of the first conductivity type having medium resistivity; and a well region of the second conductivity type, within which the horizontal device is formed, wherein the semiconductor region of the second conductivity type having high resistivity and the semiconductor region of the first conductivity type having medium resistivity form a p-n junction of a diode; and wherein the semiconductor region of the second conductivity type having high resistivity is deeper than the well region.