BD539D Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 120 V
• Collector-Base Voltage, max: 120 V
• Emitter-Base Voltage, max: 5 V
• Collector Current − Continuous, max: 5 A
• Collector Dissipation: 45 W
• DC Current Gain (h_fe): 40
• 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 BDP955 (SOT-223) is the SMD version of the BD539D transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.You can replace the BD539D with the 2N6533, 2SC2527, 2SC3834, 2SC4153, 2SD363, 2SD363-O, 2SD363-R, 2SD363-Y, BD651, BD955, BDT63C, BDT65C, BDT87, BDT87F, BDW43, BDW63D, BDW73D, BDX33D, BDX53D, BDX53E, BDX53F, KSD363, KSD363-O, KSD363-R, KSD363-Y, MJE15028, MJE15028G, MJE15030, MJE15030G, MJF15030 or MJF15030G.