BC548 Transistor Pinout, Equivalent, Uses

BC548 Transistor

BC548 is commonly used NPN transistor same like bc547.  Collector and emitter will remain open when the base pin is held at ground and will closed when a signal is provided to base pin. BC548 has a gain value of 110 to 800, this value determines the Amplification capacity of the transistor. The maximum 500mA current can flow through the collector pin, so we cannot connect loads more than 500mA with this transistor. The maximum base current capacity is 5mA.

BC548 Transistor

BC548 transistor comes in four different module numbers BC548, BC548A, BC548B and BC548C. The Difference among the four is only their DC current gain value. BC548 current gain value is from 110 to 800, BC548A is from 110 to 220, BC548B is from 200 to 450 and BC548C is from 420 to 800.

Technical specifications of Transistor:

  • Bi-Polar NPN Transistor
  • Maximum Collector Current: 500mA 
  • Max Collector-Emitter Voltage: 30V
  • Maximum Collector-Base Voltage: 30V
  • Max Emitter-Base Voltage: 5V
  • Transition Frequency: 150 MHz
  • Max Collector Dissipation : 625MW
  • Min & Max DC Current Gain: 110 – 800
  • Max Storage & Operating temperature Should Be: -55 to +150C
  • Package Type: TO-92

Replacement and Equivalent:

BC547, 2N2222,BC549, BC550,2N3904,3906 are the alternate of BC548 but pin configuration may be differed so, must check the pin configuration before the use of any alternate of BC548.

PNP Complementary

PNP Complementary of BC548 is BC556,BC557 and BC558.


  • Driver Modules like Relay Driver, LED driver, and switching modules.
  • Amplifier modules like Audio amplifiers, signal Amplifier etc.
  • Darlington pair can be made with this also.
  • Sensor Circuits

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How to Safely Long Run in a Circuit:

To increase the performance of this transistor you should, must follow the guide lines and specification given above in technical specifications. Do not drive the device above 30V, and always use the pins with correct direction because wrong input can damage the transistor. Do not use the device in over temperature more than 150c.

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