Patent ID: 8431990

Claim:
A semiconductor device, comprising: a substrate; a gate that extends on the substrate in a first horizontal direction; a source region at a first side of the gate and extending in the first horizontal direction; a body region of a first conductivity type under the source region and extending in the first horizontal direction; a drain region of a second conductivity type at a second side of the gate and extending in the first horizontal direction; a drift region of the second conductivity type and extending between the body region and the drain region in the substrate in a second, intersecting, horizontal direction; a first buried layer under the drift region in the substrate, the first buried layer extending in the first and second horizontal directions; and a plurality of second buried layers between the first buried layer and the drift region in the substrate, the second buried layers extending in the second horizontal direction and being spaced apart from each other in the first horizontal direction, wherein the first and second buried layers extend from the body region in the second horizontal direction, and wherein the second buried layers extend further than the first buried layer in the second horizontal direction.