Patent ID: 7642596

Claim:
An insulated gate field effect transistor, comprising: a semiconductor body defining opposed first and second major surfaces; a drain region of a first conductivity type extending vertically between the second major surface and part of the first major surface; a body region of a second conductivity type opposite to the first conductivity type extending from the first major surface to a body depth; a source region of the first conductivity type adjacent to the body region at the first major surface; a source contact contacting the source region and a drain contact contacting the drain region; an insulated gate extending laterally over the first major surface over the body region, defining a channel region extending in the body region from a source end adjacent to the source region to a drain end adjacent to a channel end part of the drain region; a conductive shield plate for shielding the gate, extending in an insulated trench from the first major surface towards the second major surface, the conductive shield plate being separated from the body region by part of the drain region including the channel end part of the drain region and the conductive shield plate being electrically connected to the source region; and a conductive shield plate extension connected to the shield plate extending laterally over the first major surface of the drain region from the shield plate towards the channel end part of the drain region, the shield plate extension being separated by insulator from the drain region.