2SD866-R 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 120
• Transition Frequency, min: 30 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 2SD866-R transistor can have a current gain of 60 to 120. The gain of the 2SD866 will be in the range from 60 to 260, for the 2SD866-P it will be in the range from 130 to 260, for the 2SD866-Q it will be in the range from 90 to 180.Sometimes the "2S" prefix is not marked on the package - the 2SD866-R might only be marked "D866-R".The complementary PNP transistor to the 2SD866-R is the 2SB870-R.You can replace the 2SD866-R with the 2N6488, 2N6488G, 2SC2334, 2SC2527, 2SD1271, 2SD1271-R, 2SD569, 2SD569-L, 2SD866A, 2SD866A-R, BD537, BD543B, BD543C, BD545B, BD545C, BD709, BD711, BD743B, BD743C, BD799, BD801, BD809, BD909, BD911, BDT83, BDT83F, BDT85, BDT85F, BDT87, BDT87F, BDT93, BDT93F, BDT95, BDT95F, BDX77, D44H11, D44H11FP, KSC2334, KSD569, KSD569-O, MJE15028, MJE15028G, MJE15030, MJE15030G, MJF15030 or MJF15030G.