Patent ID: 6313509
Filing Date: 2001-11-06
Classification: H01L

Abstract:
A semiconductor device, comprising:an electrostatic discharge protection means for protecting a second transistor from an electrostatic discharge, said protection means having a first transistor formed on a semiconductor substrate, said first transistor having:a first gate formed on said semiconductor substrate via a first insulating film;a first conductive region formed in a surface region of said semiconductor substrate on one side of said first gate;a second conductive region formed in the surface region of said semiconductor substrate on the other side of said first gate;a third conductive region formed in the surface region of said semiconductor substrate between said first conductive region and a lower portion on one side of said first gate of said first transistor; anda fourth conductive region formed in the surface region of said semiconductor substrate between said second conductive region and a lower portion on the other side of said first gate of said first transistor, whereinsaid first, second, and third conductive regions have the same conductivity type while said fourth conductive region has a conductivity type opposite to that of said third conductive region,said third conductive region has a resistance higher than that of said first conductive region,said second transistor has a second gate formed on said semiconductor substrate via a second insulating film and a pair of conductive regions, andone of said pair of conductive regions being connected to at least one of said first and second conductive regions.