Patent ID: 8148773

Claim:
A vertical semiconductor power IGBT device comprising a plurality of semiconductor power cells with each cell comprising a trenched gate surrounded by an emitter region with first type conductivity in active area encompassed in a base region with second type conductivity, wherein said IGBT cell further comprising: a heavily doped substrate with said second type conductivity; a first epitaxial layer grown on the substrate and heavily doped with the first type conductivity; a second epitaxial layer grown on the first epitaxial layer and lightly doped with the first type conductivity; an emitter metal layer connected to said emitter regions and said base regions via trench emitter-base contacts; a gate-emitter clamp diode connected between a first gate metal and an emitter metal, composed of multiple back-to-back Zener diodes disposed inside of edge termination area; a gate-collector clamp diode connected between a second gate metal and a first collector metal, composed of multiple back-to-back polysilicon Zener diodes disposed outside of edge termination area without having said polysilicon zener diode or said second gate metal cross over said edge termination; said first collector metal connected to a first collector region formed in said second epitaxial layer via trench collector contacts; a second collector metal layer connected to a second collector region formed on a bottom surface of the substrate; and said first and second gate metals connected together at a gate lead frame through at least a bonding wire.