Patent ID: 7968940

Claim:
An insulated gate bipolar transistor (IGBT) device, comprising: a p+ substrate; a cathode terminal; an anode terminal; a p+ cathode short region; a n+ cathode region; an n well; a deep p well; a n− drift region; a first gate; a second gate; a p+ diffusion region; a p+ layer; a metal plug; and a pre-formed hole channel, disposed at a surface of the n well underneath the second gate, constituting a p-channel depletion-mode MOSFET with the p+ cathode short region, the p+ diffusion region and the n well, wherein the first gate is a trench gate, a part of a n-channel MOSFET, and the second gate is a planar gate adjacent to the cathode terminal, a part of the p-channel depletion-mode MOSFET; and the first gate and the second gate are coupled together and are at a potential referred to that of the cathode terminal.