2SD1271 Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 80 V
• Collector-Base Voltage, max: 130 V
• Emitter-Base Voltage, max: 7 V
• Collector Current − Continuous, max: 7 A
• Collector Dissipation: 40 W
• DC Current Gain (h_fe): 60 to 260
• Transition Frequency, min: 30 MHz
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: TO-220F

Here is an image showing the pin diagram of this transistor.The 2SD1271 transistor can have a current gain of 60 to 260. The gain of the 2SD1271-P will be in the range from 130 to 260, for the 2SD1271-Q it will be in the range from 90 to 180, for the 2SD1271-R it will be in the range from 60 to 120.Sometimes the "2S" prefix is not marked on the package - the 2SD1271 might only be marked "D1271".The complementary PNP transistor to the 2SD1271 is the 2SB946.You can replace the 2SD1271 with the 2SD866, 2SD866A, BD537, BD543B, BD543C, BD545B, BD545C, BD799, BD801, BD809, BDT83, BDT83F, BDT85, BDT85F, BDT87, BDT87F, BDX77, D44H11, D44H11FP, MJE15028, MJE15028G, MJE15030, MJE15030G, MJF15030 or MJF15030G.