Patent ID: 6046480
Filing Date: 2000-04-04
Classification: H01L

Abstract:
A semiconductor device protection circuit for protecting a semiconductor device from a surge applied to a drain region, comprising:a second-conductive type transistor being formed in a first-conductive type first region and having a gate electrode, said drain region and a source region to which a supply potential is applied;a first-conductive type first diffusion region at least partially overlapping said first-conductive type first region and to which said supply potential is applied; anda second-conductive type second diffusion region being formed in said first-conductive type first region and being a non-element of a transistor,wherein said gate electrode of said second-conductive type transistor being electrically connected to said second diffusion region, and further, wherein said second diffusion region is on the side of said source region with respect to said gate electrode and is surrounded by said source region, said gate electrode and said first diffusion region adjacent said source region.