BDW51B Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 80 V
• Collector-Base Voltage, max: 80 V
• Emitter-Base Voltage, max: 5 V
• Collector Current − Continuous, max: 15 A
• Collector Dissipation: 125 W
• DC Current Gain (h_fe): 750 to 150
• Transition Frequency, min: 3 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 BDW51B is the BDW52B.You can replace the BDW51B with the 2N6283, 2N6283G, 2N6284, 2N6284G, 2N6472, 2SC1584, 2SC1585, 2SC2431, 2SC2433, 2SD797, BD315, BD317, BDW51C, KD503, MJ11018, MJ15001, MJ15001G, MJ15003 or MJ15003G.