Patent ID: 8598659
Filing Date: 2013-12-03
Classification: H01L

Abstract:
1. A transistor device comprising: a lightly doped layer of semiconductor material of a first conductive type; a body region of semiconductor material of a second conductive type formed in said lightly doped layer; said first conductive type being different than said second conductive type; a source region of said first conductive type formed in said body region, said source region being more doped than said lightly doped layer; a horse-shoe shaped region of said second conductive type formed in said body region, said horse-shoe shaped region partially surrounding said source region and being more doped than said body region; a drain region of said first conductive type formed in said lightly doped layer, said drain region being more doped than said lightly doped layer; a drift region of said lightly doped layer contiguously disposed between said body region and said drain region; and a gate electrode surrounding said drain region, said gate electrode partially disposed over a thin oxide and partially over a thick oxide, wherein said gate electrode extended over said thick oxide from over said thin oxide controls the electric field in said drift region to increase the avalanche breakdown of said drain region.