BC557 PNP Transistor




BC557 is a PNP transistor hence the collector and emitter will be closed (Forward biased) when the base pin is held at ground and will be opened (Reverse biased) when a signal is provided to base pin. This is where a PNP transistor differs from a NPN transistor, a Logic state (blue colour) is used to toggle between Ground and Signal Voltage (Emitter-Base Voltage VBE)

BC557 Pin Configuration

Pin NumberPin NameDescription
1CollectorCurrent flows in through collector
2BaseControls the biasing of transistor
3EmitterCurrent Drains out through emitter



  • Bi-Polar PNP Transistor
  • DC Current Gain (hFE) is 300 maximum
  • Continuous Collector current (IC) is 100mA
  • Emitter Base Voltage (VBE) is 6V
  • Base Current(IB) is 5mA maximum
  • Available in To-92 Package


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