Patent ID: 7859083

Claim:
A semiconductor device comprising: an active region as a main operation region; a main electrode film provided on a surface of the active region; a gate metal electrode pad that is formed on a surface of a rectangular polysilicon layer provided outside the active region; a multi-stage Zener diode formed in the polysilicon layer in such a manner that multiple stages of p-type layers and n-type layers are alternately formed; wherein the gate metal electrode pad is formed on the Zener diode with an insulating film interposed in between, one contact region of the Zener diode is electrically connected to the gate metal electrode pad and another contact region is electrically connected to the main electrode film; wherein the gate metal electrode pad and the main electrode film are electrically connected to the two contact regions of the rectangular Zener diode through contact holes that are formed selectively through the insulating film, at least one pair of contact holes corresponding to the two contact regions are separated from each other in a direction parallel with pn junctions, and the gate metal electrode pad and the main electrode film are isolated from each other between at least the one pair of contact holes.