Field Stop Trench IGBTs ROHM Field Stop Trench IGBTs are energy-saving, high-efficiency IGBTs used in a wide range of high-voltage and high-current applications. These IGBTs feature a low collector and emitter saturation voltage, short-circuit that withstands time, and built-in very fast and soft recovery FRD. The field stop trench IGBTs are ideal for UPS, power conditioners, welder, and general inverters for industrial use.