BD951 Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 80 V
• Collector-Base Voltage, max: 80 V
• Emitter-Base Voltage, max: 5 V
• Collector Current − Continuous, max: 5 A
• Collector Dissipation: 40 W
• DC Current Gain (h_fe): 40
• 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 BD951 is the BD952.The BDP951 (SOT-223) is the SMD version of the BD951 transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.You can replace the BD951 with the 2N6044, 2N6044G, 2N6045, 2N6045G, 2N6388, 2N6388G, 2N6530, 2N6531, 2N6532, 2N6533, 2SC1986, 2SC2316, 2SC2334, 2SC2334K, 2SC2334L, 2SC2334M, 2SC2527, 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, 2SC3834, 2SC4153, 2SC4511, 2SC4511-O, 2SC4511-P, 2SC4511-Y, 2SC4512, 2SC4512-O, 2SC4512-P, 2SC4512-Y, 2SD1195, 2SD1196, 2SD1270, 2SD1270-P, 2SD1270-Q, 2SD1270-R, 2SD1271, 2SD1271-P, 2SD1271-Q, 2SD1271-R, 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, 2SD1829, 2SD1830, 2SD1892, 2SD1892-P, 2SD1892-Q, 2SD2059, 2SD2059-O, 2SD2059-R, 2SD2059-Y, 2SD2495, 2SD2495-O, 2SD2495-P, 2SD2495-Y, 2SD363, 2SD363-O, 2SD363-R, 2SD363-Y, 2SD525, 2SD525-O, 2SD525-R, 2SD525-Y, 2SD560, 2SD560-KB, 2SD560-LB, 2SD560-MB, 2SD569, 2SD569-K, 2SD569-L, 2SD569-M, 2SD613, 2SD613-C, 2SD613-D, 2SD613-E, 2SD613-F, 2SD633, 2SD634, 2SD812, 2SD812-P, 2SD812-Q, 2SD812-R, 2SD866, 2SD866-P, 2SD866-Q, 2SD866-R, 2SD866A, 2SD866A-P, 2SD866A-Q, 2SD866A-R, BD537, BD537K, BD539B, BD539C, BD539D, BD543B, BD543C, BD545B, BD545C, BD647, BD649, BD651, BD899, BD899A, BD901, BD953, BD955, BDT63A, BDT63B, BDT63C, BDT65A, BDT65B, BDT65C, BDT83, BDT83F, BDT85, BDT85F, BDT87, BDT87F, BDW23B, BDW23C, BDW41, BDW41G, BDW42, BDW42G, BDW43, BDW63B, BDW63C, BDW63D, BDW73B, BDW73C, BDW73D, BDW93B, BDW93C, BDW93CF, BDX33B, BDX33BG, BDX33C, BDX33CG, BDX33D, BDX53B, BDX53BG, BDX53C, BDX53CG, BDX53D, BDX53E, BDX53F, D44H11, D44H11FP, KSB601, KSB601-O, KSB601-R, KSB601-Y, KSC2334, KSC2334O, KSC2334R, KSC2334Y, KSD363, KSD363-O, KSD363-R, KSD363-Y, KSD560, KSD560-O, KSD560-R, KSD560-Y, KSD569, KSD569-O, KSD569-R, KSD569-Y, KTC2018, KTC2018-O, KTC2018-Y, KTC2028, KTC2028O, KTC2028Y, KTD2059, KTD2059O, KTD2059R, KTD2059Y, MJE15028, MJE15028G, MJE15030, MJE15030G, MJF122, MJF122G, MJF15030, MJF15030G, MJF6388, MJF6388G, TIP101, TIP101G, TIP102, TIP102G, TIP121, TIP121G, TIP122, TIP122G, TIP131, TIP131G, TIP132, TIP132G, TIP141T, TIP142T, TTC3710B or TTD1415B.