BDW39 Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 45 V
• Collector-Base Voltage, max: 45 V
• Emitter-Base Voltage, max: 5 V
• Collector Current − Continuous, max: 15 A
• Collector Dissipation: 85 W
• DC Current Gain (h_fe): 1000
• Transition Frequency, min: 4 MHz
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: TO-220

Here is an image showing the pin diagram of this transistor.The complementary PNP transistor to the BDW39 is the BDW44.You can replace the BDW39 with the BDW40, BDW41 or BDW41G.