The GMC31CG151J50NT is a chip manufactured by Cal-Chip. It is a 1.5kV UPFET DMOS transistor with a built-in suppression diode. This transistor is designed to be used in high voltage DC/DC converter circuits, including industrial power supplies and audio power amplifiers. It has a gate-source voltage of ±18V, a drain-source voltage of 1500V, and a drain current of 5A. The GMC31CG151J50NT also has an avalanche energy rating of 94mJ and thermal resistance of 1.7 °C/W.