MJ12003 Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 750 V
• Collector-Base Voltage, max: 1500 V
• Emitter-Base Voltage, max: 5 V
• Collector Current − Continuous, max: 4 A
• Collector Dissipation: 100 W
• DC Current Gain (h_fe): 6
• Transition Frequency, min: 4 MHz
• Operating and Storage Junction Temperature Range: -65 to +150 °C
• Package: TO-3

Here is an image showing the pin diagram of this transistor.You can replace the MJ12003 with the MJ12004, MJ12005, MJ8503 or MJ8505.