BDT31B Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 80 V
• Collector-Base Voltage, max: 120 V
• Emitter-Base Voltage, max: 5 V
• Collector Current − Continuous, max: 3 A
• Collector Dissipation: 40 W
• DC Current Gain (h_fe): 10 to 50
• Transition Frequency, min: 3 MHz
• Operating and Storage Junction Temperature Range: -65 to +150 °C
• Package: TO-220

Here is an image showing the pin diagram of this transistor.The complementary PNP transistor to the BDT31B is the BDT32B.You can replace the BDT31B with the BDT31C, MJF31C, MJF31CG, TIP31B, TIP31BG, TIP31C, TIP31CF, TIP31CG, TIP31D, TIP31E or TIP31F.