BF422 Bipolar Transistor

Characteristics of BF422 Transistor

  • Type: NPN
  • Collector-Emitter Voltage, max: 250 V
  • Collector-Base Voltage, max: 250 V
  • Emitter-Base Voltage, max: 5 V
  • Collector Current − Continuous, max: 0.05 A
  • Collector Dissipation: 0.8 W
  • DC Current Gain (hfe): 50
  • Transition Frequency, min: 60 MHz
  • Operating and Storage Junction Temperature Range: -55 to +150 °C
  • Package: TO-92

Pinout of BF422

The BF422 is manufactured in a plastic TO-92 case. When looking at the flat side with the leads pointed downward, the three leads emerging from the transistor are, from left to right, the emitter, collector, and base leads.
Here is an image showing the pin diagram of this transistor.

Complementary PNP transistor

The complementary PNP transistor to the BF422 is the BF423.

SMD Version of BF422 transistor

The BF620 (SOT-89), BF622 (SOT-89), BF820 (SOT-23) and BF822 (SOT-23) is the SMD version of the BF422 transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.

Replacement and Equivalent for BF422 transistor

You can replace the BF422 with the 2SC1473AQ, 2SC1473AR, 2SC1573A-Q, 2SC1573A-R, 2SC1573B-Q, 2SC1573B-R, 2SC2271-D, 2SC2271-E, 2SC2551-O, 2SC3468-D, 2SC3468-E, 2SC3468-F, 2SC3941-Q, 2SC3941-R, BF420, KSC1506-O, KSC1506-Y, KSC2330O or KSC2330Y.
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