GT30J127 (often marked 30J127) is a power IGBT transistor used for switching high voltage and high current in power electronics. 

Main Specifications

• Type: IGBT (Insulated-Gate Bipolar Transistor)

• Collector-Emitter Voltage (Vce): about 600 V

• Continuous Collector Current (Ic): about 30 A

• Pulse Current: up to 200 A

• Gate Voltage (Vge): ±30 V max

• Power Dissipation: ~75 W

• Package: TO-220F / TO-220SIS

• Max Junction Temperature: ~150 °C 

Pinout

Typical TO-220 IGBT pin configuration:

1. Gate (G)

2. Collector (C)

3. Emitter (E)
   Metal tab = Collector

Typical Applications

This transistor is used in high-power switching circuits, such as:

• Inverters

• Motor drivers

• UPS power supplies

• Induction heating

• Plasma TV power circuits

• Welding machines 

Equivalent / Similar IGBTs

Possible alternatives (depending on circuit):

• GT30J121

• GT30J122

• GT30J126

• HGTG30N60