TIP121 Bipolar Transistor

Characteristics of TIP121 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: 5 A
  • Collector Dissipation: 65 W
  • DC Current Gain (hfe): 1000
  • Operating and Storage Junction Temperature Range: -65 to +150 °C
  • Package: TO-220

Pinout of TIP121

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

Equivalent circuit

TIP121 equivalent circuit

Complementary PNP transistor

The complementary PNP transistor to the TIP121 is the TIP126.

Replacement and Equivalent for TIP121 transistor

You can replace the TIP121 with the 2N6044, 2N6044G, 2N6045, 2N6045G, 2N6388, 2N6388G, 2N6530, 2N6532, 2SD1195, 2SD1196, 2SD1277A, 2SD1277A-P, 2SD1277A-Q, 2SD1415, 2SD1415A, 2SD1829, 2SD1830, 2SD1892, 2SD1892-P, 2SD1892-Q, 2SD2495, 2SD2495-O, 2SD2495-P, 2SD2495-Y, 2SD560, 2SD560-KB, 2SD560-LB, 2SD560-MB, 2SD633, 2SD634, BDT63A, BDT63B, BDT63C, BDT65A, BDT65B, BDT65C, BDW41, BDW41G, BDW42, BDW42G, BDW43, KSB601, KSB601-O, KSB601-R, KSB601-Y, KSD560, KSD560-O, KSD560-R, KSD560-Y, MJF122, MJF122G, MJF6388, MJF6388G, TIP101, TIP101G, TIP102, TIP102G, TIP121G, TIP122, TIP122G, TIP131, TIP131G, TIP132, TIP132G, TIP141T, TIP142T or TTD1415B.

Lead-free Version

The TIP121G transistor is the lead-free version of the TIP121.
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