Patent ID: 6989568

Claim:
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, and having a first contact surface being in contact with 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, and having a second contact surface being in contact with the source region and the substrate contact region, wherein: the drain contact region has a first distance from the first contact surface to an edge of the drain contact region facing the source region, the source region has a second distance from the second contact surface to an edge of the source region facing the drain region, and of the first and second distances, only the first distance is 5 μm or more.