Patent ID: 7956419

Claim:
A punch through trench type IGBT device, comprising: an N type wafer float zone silicon, the N type wafer having top and bottom surfaces and a thickness; a MOSgated junction pattern formed on the top surface of the N type wafer; at least one metal layer arranged on the top surface of the N type wafer; a non-epitaxial depletion stop N + buffer zone that is less than 150 microns thick having a top surface and a bottom surface; a P type weak anode arranged adjacent to the bottom surface of the N + buffer zone; and a backside metal contact connected to the P type weak anode, wherein the thickness of the N type wafer float zone silicon is between 60 um and 140 um, the breakdown voltage of the punch through trench type IGBT being approximately 600V at 60 um thickness.