BD539A Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 60 V
• Collector-Base Voltage, max: 60 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 complementary PNP transistor to the BD539A is the BD540A.The BDP949 (SOT-223) is the SMD version of the BD539A transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.You can replace the BD539A with the 2N6043, 2N6043G, 2N6044, 2N6044G, 2N6045, 2N6045G, 2N6387, 2N6387G, 2N6388, 2N6388G, 2N6530, 2N6531, 2N6532, 2N6533, 2SC1985, 2SC1986, 2SC2315, 2SC2316, 2SC2334, 2SC2334K, 2SC2334L, 2SC2334M, 2SC2527, 2SC3145, 2SC3253, 2SC3253-Q, 2SC3253-R, 2SC3253-S, 2SC3254, 2SC3254-Q, 2SC3254-R, 2SC3254-S, 2SC3255, 2SC3255-Q, 2SC3255-R, 2SC3255-S, 2SC3258, 2SC3258-O, 2SC3258-Y, 2SC3308, 2SC3308-O, 2SC3308-Y, 2SC3346, 2SC3346-O, 2SC3346-Y, 2SC3540, 2SC3540-O, 2SC3540-Y, 2SC3710, 2SC3710-O, 2SC3710-Y, 2SC3710A, 2SC3710A-O, 2SC3710A-Y, 2SC3746, 2SC3746-Q, 2SC3746-R, 2SC3746-S, 2SC3747, 2SC3747-Q, 2SC3747-R, 2SC3747-S, 2SC3748, 2SC3748-Q, 2SC3748-R, 2SC3748-S, 2SC3834, 2SC4153, 2SC4511, 2SC4511-O, 2SC4511-P, 2SC4511-Y, 2SC4512, 2SC4512-O, 2SC4512-P, 2SC4512-Y, 2SC4550, 2SC4550-K, 2SC4550-L, 2SC4550-M, 2SC4551, 2SC4551-K, 2SC4551-L, 2SC4551-M, 2SC4552, 2SC4552-K, 2SC4552-L, 2SC4552-M, 2SD1191, 2SD1192, 2SD1195, 2SD1196, 2SD1270, 2SD1270-P, 2SD1270-Q, 2SD1270-R, 2SD1271, 2SD1271-P, 2SD1271-Q, 2SD1271-R, 2SD1277, 2SD1277-P, 2SD1277-Q, 2SD1277A, 2SD1277A-P, 2SD1277A-Q, 2SD1355, 2SD1355-O, 2SD1355-R, 2SD1355-Y, 2SD1362, 2SD1362-O, 2SD1362-Y, 2SD1407, 2SD1407-O, 2SD1407-R, 2SD1407-Y, 2SD1407A, 2SD1407A-O, 2SD1407A-R, 2SD1407A-Y, 2SD1411, 2SD1411-O, 2SD1411-Y, 2SD1411A, 2SD1411A-O, 2SD1411A-Y, 2SD1415, 2SD1415A, 2SD1588, 2SD1588-K, 2SD1588-L, 2SD1588-M, 2SD1826, 2SD1827, 2SD1829, 2SD1830, 2SD1892, 2SD1892-P, 2SD1892-Q, 2SD2059, 2SD2059-O, 2SD2059-R, 2SD2059-Y, 2SD2495, 2SD2495-O, 2SD2495-P, 2SD2495-Y, 2SD362-O, 2SD362-R, 2SD363, 2SD363-O, 2SD363-R, 2SD363-Y, 2SD525, 2SD525-O, 2SD525-R, 2SD525-Y, 2SD560, 2SD560-KB, 2SD560-LB, 2SD560-MB, 2SD568, 2SD568-K, 2SD568-L, 2SD568-M, 2SD569, 2SD569-K, 2SD569-L, 2SD569-M, 2SD613, 2SD613-C, 2SD613-D, 2SD613-E, 2SD613-F, 2SD633, 2SD634, 2SD635, 2SD812, 2SD812-P, 2SD812-Q, 2SD812-R, 2SD866, 2SD866-P, 2SD866-Q, 2SD866-R, 2SD866A, 2SD866A-P, 2SD866A-Q, 2SD866A-R, BD535, BD535K, BD537, BD537K, BD539B, BD539C, BD539D, BD543A, BD543B, BD543C, BD545A, BD545B, BD545C, BD645, BD647, BD649, BD651, BD897, BD897A, BD899, BD899A, BD901, BD949, BD951, BD953, BD955, BDT63, BDT63A, BDT63B, BDT63C, BDT65, BDT65A, BDT65B, BDT65C, BDT81, BDT81F, BDT83, BDT83F, BDT85, BDT85F, BDT87, BDT87F, BDW23A, BDW23B, BDW23C, BDW40, BDW41, BDW41G, BDW42, BDW42G, BDW43, BDW63A, BDW63B, BDW63C, BDW63D, BDW73A, BDW73B, BDW73C, BDW73D, BDW93A, BDW93B, BDW93C, BDW93CF, BDX33A, BDX33B, BDX33BG, BDX33C, BDX33CG, BDX33D, BDX53A, BDX53B, BDX53BG, BDX53C, BDX53CG, BDX53D, D44H11, D44H11FP, D44H8, KSB601, KSB601-O, KSB601-R, KSB601-Y, KSC2334, KSC2334O, KSC2334R, KSC2334Y, KSD1588, KSD1588-O, KSD1588-R, KSD1588-Y, KSD362-O, KSD362-R, KSD363, KSD363-O, KSD363-R, KSD363-Y, KSD560, KSD560-O, KSD560-R, KSD560-Y, KSD568, KSD568-O, KSD568-R, KSD568-Y, KSD569, KSD569-O, KSD569-R, KSD569-Y, KTC2018, KTC2018-O, KTC2018-Y, KTC2028, KTC2028O, KTC2028Y, KTD2059, KTD2059O, KTD2059R, KTD2059Y, MJE15028, MJE15028G, MJF122, MJF122G, MJF6388, MJF6388G, TIP100, TIP100G, TIP101, TIP101G, TIP102, TIP102G, TIP120, TIP120G, TIP121, TIP121G, TIP122, TIP122G, TIP130, TIP130G, TIP131, TIP131G, TIP132, TIP132G, TIP140T, TIP141T, TIP142T, TTC3710B or TTD1415B.