Patent ID: 6407413
Filing Date: 2002-06-18
Classification: H01L

Abstract:
A semiconductor device comprising:a semiconductor substrate comprising a first semiconductor layer of a first conductivity type, and a second semiconductor layer of a second conductivity type formed on said first semiconductor layer; at least one guard ring extending from a surface of said second semiconductor layer inwardly of said second semiconductor layer and provided in the form of a well of an impurity of said first conductivity type; a field insulation film formed on a first region included in said surface of said second semiconductor layer and containing a surface of said at least one guard ring; and a Zener diode layer formed on a second region included in a surface of said field insulation film and containing a portion positioned over said surface of said at least one guard ring, said Zener diode layer having a plurality of pn junctions formed by alternately repeatedly arranging p and n layers, wherein said pn junctions are formed only in a first portion of said Zener diode layer which is positioned over said surface of said at least one guard ring.