Patent ID: 6707104
Filing Date: 2004-03-16
Classification: H01L

Abstract:
A semiconductor device having a lateral high-breakdown-voltage transistor comprising:a first-conductivity-type semiconductor layer; a second-conductivity-type source region formed in the semiconductor layer; a second-conductivity-type drain region formed in or outside the semiconductor layer, separated from the source region; a gate electrode formed above the semiconductor layer between the drain region and the source region, insulated from the semiconductor layer; a second-conductivity-type drain contact region formed in the drain region and having a higher impurity concentration than the drain region; a drain wiring electrically connected to the drain region via the drain contact region; a first-conductivity-type substrate contact region formed adjacent to the source region; and a source wiring electrically connected to the source region, and also connected to the semiconductor layer via the substrate contact region, the source wiring touching a portion of the source region and the substrate contact region, thereby forming a contact surface therebetween, the substrate contact region laterally extending from inside the contact surface to outside the contact surface along a surface of the semiconductor layer.