2SD837A 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: 4 A
• Collector Dissipation: 40 W
• DC Current Gain (h_fe): 1000 to 10000
• 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 2SD837A transistor can have a current gain of 1000 to 10000. The gain of the 2SD837A-P will be in the range from 4000 to 10000, for the 2SD837A-Q it will be in the range from 2000 to 5000, for the 2SD837A-R it will be in the range from 1000 to 2500.Sometimes the "2S" prefix is not marked on the package - the 2SD837A might only be marked "D837A".The complementary PNP transistor to the 2SD837A is the 2SB751A.You can replace the 2SD837A with the 2N6044, 2N6044G, 2N6045, 2N6045G, 2N6388, 2N6388G, 2N6530, 2N6531, 2N6532, 2N6533, 2SC1986, 2SC2075, 2SC2316, 2SD1274, 2SD1274A, 2SD1274B, 2SD2241, 2SD772, 2SD792, 2SD823, BD243B, BD243C, BD537, BD539B, BD539C, BD539D, BD543B, BD543C, BD545B, BD545C, BD647, BD649, BD651, BD799, BD801, BD809, BD899, BD899A, BD901, BD951, BD953, BD955, BDT61A, BDT61B, BDT61C, BDT63A, BDT63B, BDT63C, BDT65A, BDT65B, BDT65C, BDT83, BDT83F, BDT85, BDT85F, BDT87, BDT87F, BDW23B, BDW23C, BDW41, BDW41G, BDW42, BDW42G, BDW43, BDW53B, BDW53C, BDW53D, BDW63B, BDW63C, BDW63D, BDW73B, BDW73C, BDW73D, BDX33B, BDX33BG, BDX33C, BDX33CG, BDX33D, BDX53B, BDX53BG, BDX53C, BDX53CG, BDX53D, BDX53E, BDX53F, BDX77, D44H11, D44H11FP, MJE15028, MJE15028G, MJE15030, MJE15030G, MJE802T, MJE803T, MJF15030, MJF15030G, TIP101, TIP101G, TIP102, TIP102G, TIP121, TIP121G, TIP122, TIP122G, TIP131, TIP131G, TIP132, TIP132G, TIP141T, TIP142T, TIP41D, TIP41E, TIP41F, TIP42D, TIP42E or TIP42F.