MJ12021 Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 450 V
• Collector-Base Voltage, max: 850 V
• Emitter-Base Voltage, max: 6 V
• Collector Current − Continuous, max: 8 A
• Collector Dissipation: 150 W
• DC Current Gain (h_fe): 5
• Transition Frequency, min: 15 MHz
• Operating and Storage Junction Temperature Range: -65 to +200 °C
• Package: TO-3

Here is an image showing the pin diagram of this transistor.You can replace the MJ12021 with the 2SC2429A, 2SC2965, 2SC3046, 2SC3058A, BUX47A, BUX48A, BUX48B, BUX48C, BUX81, MJ12005, MJ12022, MJ16006, MJ16008, MJ8504 or MJ8505.