Patent ID: 7026705
Filing Date: 2006-04-11
Classification: H01L

Abstract:
1. A semiconductor device including a surge protection circuit electrically connected to a signal input terminal and having a diode and a transistor, comprising: a semiconductor substrate having a main surface; a field oxide film formed at the main surface of said semiconductor substrate; and a first conductive layer formed on the main surface of said semiconductor substrate and electrically connected to said signal input terminal, said diode having its cathode including a first cathode region and a second cathode region, said first cathode region being electrically connected to said first conductive layer and formed at the main surface of said semiconductor substrate, said second cathode region constituting, together with an anode region of said diode, a pn junction where Zener breakdown occurs, and said first and second cathode regions being non-contacting, and said pn junction where the Zener breakdown occurs being distant from said field oxide film.