The HGTG15N120C3, HGTP15N120C3, HGT1S15N120C3 and HGT1S15N120C3S are MOS gated high voltage switching devices combining the best features of MOSFETs and bipolar transistors. These devices have the high input impedance of a MOSFET and the low on-state conduction loss of a bipolar transistor. The much lower on-state voltage drop varies only moderately between 25oC and 150oC.