BD543 Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 40 V
• Collector-Base Voltage, max: 40 V
• Emitter-Base Voltage, max: 5 V
• Collector Current − Continuous, max: 8 A
• Collector Dissipation: 70 W
• DC Current Gain (h_fe): 60
• 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 BD543 is the BD544.The 2STF1550 (SOT-89) and 2STN1550 (SOT-223) is the SMD version of the BD543 transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.You can replace the BD543 with the 2N6043, 2N6043G, 2N6044, 2N6044G, 2N6386, 2N6387, 2N6387G, 2N6388, 2N6388G, 2N6530, 2SC3255, 2SC3255-Q, 2SC3255-R, 2SC3255-S, 2SC3345, 2SC3345-O, 2SC3345-Y, 2SC3346, 2SC3346-O, 2SC3346-Y, 2SC3709, 2SC3709-O, 2SC3709-Y, 2SC3709A, 2SC3709A-O, 2SC3709A-Y, 2SC3710, 2SC3710-O, 2SC3710-Y, 2SC3710A, 2SC3710A-O, 2SC3710A-Y, 2SC3748, 2SC3748-Q, 2SC3748-R, 2SC3748-S, 2SC4551, 2SC4551-K, 2SC4551-L, 2SC4551-M, 2SC4552, 2SC4552-K, 2SC4552-L, 2SC4552-M, 2SD1062, 2SD1062-Q, 2SD1062-R, 2SD1062-S, 2SD1158, 2SD1192, 2SD1277, 2SD1277-P, 2SD1277-Q, 2SD1277A, 2SD1277A-P, 2SD1277A-Q, 2SD1445A, 2SD1445A-P, 2SD1445A-Q, 2SD1669, 2SD1669-Q, 2SD1669-R, 2SD1669-S, 2SD1827, BD543A, BD543B, BD545, BD545A, BD545B, BD643, BD645, BD647, BD895, BD895A, BD897, BD897A, BD899, BD899A, BDT63, BDT63A, BDT65, BDT65A, BDW39, BDW40, BDW41, BDW41G, BDW73, BDW73A, BDW73B, BDW93, BDW93A, BDW93B, BDX33, BDX33A, BDX33B, BDX33BG, BDX53, BDX53A, BDX53B, BDX53BG, D44H11, D44H11FP, D44H8, TIP100, TIP100G, TIP101, TIP101G, TIP130, TIP130G, TIP131, TIP131G, TIP140T, TIP141T or TTC3710B.