BD745 Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 45 V
• Collector-Base Voltage, max: 50 V
• Emitter-Base Voltage, max: 5 V
• Collector Current − Continuous, max: 20 A
• Collector Dissipation: 115 W
• DC Current Gain (h_fe): 20 to 150
• Operating and Storage Junction Temperature Range: -65 to +150 °C
• Package: TO-3P

Here is an image showing the pin diagram of this transistor.The complementary PNP transistor to the BD745 is the BD746.You can replace the BD745 with the BD745A or BD745B.