The GT50J123 from Toshiba is a IGBT with Gate Emitter Voltage 25 V, Saturated Collector Emitter Voltage 1.9 to 2.5 V, DC Collector Current 33 to 59 A, Junction Temperature 175 Degree C, Gate Emitter Leakage Current 0.1 uA. More details for GT50J123 can be seen below.