2SD857A-R Bipolar Transistor

Characteristics of 2SD857A-R 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 (hfe): 40 to 90
  • Operating and Storage Junction Temperature Range: -55 to +150 °C
  • Package: TO-220

Pinout of 2SD857A-R

Here is an image showing the pin diagram of this transistor.

Classification of hFE

The 2SD857A-R transistor can have a current gain of 40 to 90. The gain of the 2SD857A will be in the range from 40 to 250, for the 2SD857A-P it will be in the range from 120 to 250, for the 2SD857A-Q it will be in the range from 70 to 150.

Marking

Sometimes the "2S" prefix is not marked on the package - the 2SD857A-R might only be marked "D857A-R".

Complementary PNP transistor

The complementary PNP transistor to the 2SD857A-R is the 2SB762A-R.

SMD Version of 2SD857A-R transistor

The BDP951 (SOT-223) is the SMD version of the 2SD857A-R transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.

Replacement and Equivalent for 2SD857A-R transistor

You can replace the 2SD857A-R with the 2N6131, 2N6473, 2N6474, 2N6488, 2N6488G, 2SC1986, 2SC2075, 2SC2334, 2SC3851A, 2SD1265A, 2SD1267A, 2SD1267A-R, 2SD1274, 2SD1274A, 2SD1274B, 2SD1355, 2SD1356, 2SD1407, 2SD1407A, 2SD1408, 2SD2059, 2SD2060, 2SD363, 2SD389A, 2SD525, 2SD526, 2SD569, 2SD613, 2SD743, 2SD743A, 2SD772, 2SD792, 2SD812, 2SD823, 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, KSD1408, KSD363, KSD526, KSD569, KTD2059, KTD2060, MJE15028, MJE15028G, MJE15030, MJE15030G, MJE5180, MJE5181, MJE5182, MJF15030, MJF15030G, MJF3055, MJF3055G, NTE152, NTE291, TIP41D, TIP41E, TIP41F, TIP42D, TIP42E or TIP42F.
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