2SD743-S Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 80 V
• Collector-Base Voltage, max: 100 V
• Emitter-Base Voltage, max: 5 V
• Collector Current − Continuous, max: 4 A
• Collector Dissipation: 40 W
• DC Current Gain (h_fe): 40 to 80
• Transition Frequency, min: 10 MHz
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: TO-220

Here is an image showing the pin diagram of this transistor.The 2SD743-S transistor can have a current gain of 40 to 80. The gain of the 2SD743 will be in the range from 40 to 200, for the 2SD743-Q it will be in the range from 100 to 200, for the 2SD743-R it will be in the range from 60 to 120.Sometimes the "2S" prefix is not marked on the package - the 2SD743-S might only be marked "D743-S".The complementary PNP transistor to the 2SD743-S is the 2SB703-S.The BDP951 (SOT-223) and BDP953 (SOT-223) is the SMD version of the 2SD743-S transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.You can replace the 2SD743-S with the 2N6100, 2N6101, 2N6123, 2N6131, 2N6473, 2N6474, 2N6488, 2N6488G, 2SC1986, 2SC2075, 2SC2334, 2SC2334M, 2SC3851A, 2SD1265A, 2SD1267A, 2SD1267A-R, 2SD1274, 2SD1274A, 2SD1274B, 2SD1355, 2SD1355-R, 2SD1356, 2SD1356-R, 2SD1407, 2SD1407-R, 2SD1407A, 2SD1407A-R, 2SD1408, 2SD1408-R, 2SD2059, 2SD2059-R, 2SD2060, 2SD2060-R, 2SD363, 2SD363-R, 2SD389A, 2SD525, 2SD525-R, 2SD526, 2SD526-R, 2SD569, 2SD569-M, 2SD613, 2SD613-C, 2SD743A, 2SD743A-S, 2SD772, 2SD792, 2SD812, 2SD812-R, 2SD823, 2SD857A, 2SD857A-R, BD243B, BD243C, BD537, BD537K, BD539B, BD539C, BD539D, BD709, BD711, BD743B, BD743C, BD799, BD801, BD809, BD909, BD911, BD951, BD953, BD955, BDT83, BDT83F, BDT85, BDT85F, BDT87, BDT87F, BDT93, BDT93F, BDT95, BDT95F, BDX77, KSC2334, KSC2334R, KSD1408, KSD1408-R, KSD363, KSD363-R, KSD526, KSD526-R, KSD569, KSD569-R, KTD2059, KTD2059R, KTD2060, KTD2060R, MJE15028, MJE15028G, MJE15030, MJE15030G, MJE5180, MJE5181, MJE5182, MJF15030, MJF15030G, MJF3055, MJF3055G, NTE152, NTE291, TIP41D, TIP41E, TIP41F, TIP42D, TIP42E or TIP42F.