BC547B (TO-92 Package) - NPN Bipolar Junction Transistor

BC547B is an NPN bipolar junction transistor (BJT) with a high DC current gain value of 200 to 450, where this value determines the amplification capacity of the transistor. The BC547B is very much similar to the commonly used NPN transistor 2N2222. It can allow a maximum collector current of 100mA, Base-Emitter voltage is 6V, and has a power dissipation of 500mW in a small TO-92 package. Usually, BC547B can be used as a switch or as an amplifier.

Before using the BC547B transistor in a project circuit, you should know the pinout configuration, technical specifications, equivalent, applications, and safely long run tips. So, here is the detailed information about BJT BC547B.

Pinout Configuration

The pinout configuration of NPN Transistor BC547B (TO-92 package) is as follow:

Pin Number Pin Name Description
1 Collector Current flows in through collector pin.
2 Base Base pin controls the biasing of the transistor.
3 Emitter Current Drains out through emitter pin.

Technical Specifications/Features

  • Type Designator: BC547B
  • Transistor Type: Bi-Polar high current NPN Transistor
  • Material of Transistor: Si
  • Package Type: TO-92
  • Maximum Emitter-Base Voltage (VEB): 6 V
  • Maximum Collector-Base Voltage (VCB): 50 V
  • Maximum Collector-Emitter Voltage (VCE): 45 V
  • Maximum Collector Current (IC): 100 mA
  • Maximum Collector Power Dissipation (PD): 500 mW
  • Maximum Operating Junction Temperature (Tj): 150 °C
  • Transition Frequency (ft): 300 MHz
  • Collector Capacitance (CC): 4.5 pF
  • Forward Current Transfer Ratio (hFE): 200 to 450
  • Maximum Noise Figure (dB): NA

PNP Complementary

PNP Complementary of BC547B is BC557B.


BC337, BC546, BC548, BC549, BC636, BC639, 2N2222 TO-18, 2N2222A, 2N2369, 2N3055, 2N3904, 2N3906, 2N4401, and 2SC5200 all are BC547B transistor equivalent.

Pin configuration of some transistors are different from BC547B, check pin configuration before replacing in a circuit.

Where To Use

  • You can be used to switch high current (up to 100mA) loads.
  • Signal processing circuits of television receivers
  • HI-FI amplifiers
  • Driver stages of audio amplifiers
  • Transistor Darlington Pairs
  • Sensor circuits
  • Low noise input stages of tape recorders

AliExpress.com Product - 100pcs/lot BC547B BC547 TO-92 new original In Stock

Safely Long Run Tips

To get the best performance with a BC547B transistor, you should not drive the load more than 100mA, and the collector-emitter voltage of the transistor must in under 45V. Use a suitable base resistor (RB), which provides the required current at the base of the BC547B transistor. The value for this resistor can be calculated using the formula: RB = VEB / IB. Where, the value of VEB should be 6V for BC547b, and the Base current (IB depends on the Collector current (IC). The value of IB should not exceed mA. Also, you should not operate this transistor below -65 °C and above +150 °C.


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