Patent ID: 7170134
Filing Date: 2007-01-30
Classification: H01L

Abstract:
1. A lateral semiconductor device, comprising: a first conductivity type semiconductor substrate; a second conductivity type source region formed in the semiconductor substrate; a second conductivity type extended drain region formed in the semiconductor substrate; a gate electrode formed over the semiconductor substrate between the source region and the extended drain region; a drain region formed in the extended drain region and having a second conductivity type impurity concentration higher than that of the extended drain region; at least two first conductivity type buried regions formed in the extended drain region at different depths from a surface of the extended drain region; and a second conductivity type buried region formed between the first conductivity type buried regions, wherein a second conductivity type impurity concentration at an inside of the second conductivity type buried region is higher than a second conductivity type impurity concentration at boundaries between the first conductivity type buried regions and the second conductivity type buried region.