MJ481 Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 60 V
• Collector-Base Voltage, max: 60 V
• Emitter-Base Voltage, max: 5 V
• Collector Current − Continuous, max: 4 A
• Collector Dissipation: 87.5 W
• DC Current Gain (h_fe): 30 to 200
• Transition Frequency, min: 4 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.The complementary PNP transistor to the MJ481 is the MJ491.You can replace the MJ481 with the 2SC1343, 2SC1584, 2SC519A, 2SC520A, BD315, BD317, KD502 or KD503.