BC550 NPN Transistor

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  • Switching and Amplifier
  • High−Voltage: BC546, VCEO = 65 V
  • Low−Noise: BC550
  • Complement to BC556, BC557, BC558, BC559, and BC560
  • BC550 Equivalent Transistor BC547BC548BC5492n3904, 2SC5200,BC639, BC636, 2N2222


  • The BC550 Transistor is a general purpose N-P-N transistor, in which N-P-N transistor electrons work as the primary charge carriers that are emitted from the emitter of the transistor to the PN junction. When a positive voltage is applied to the base holes are created to the base so they start migrating to the emitter junction,this process thins out the depletion region from PN junction and more and more electrons start flowing to the and all of those electrons are collected by the collector.
  • The maximum collector current of this transistor is rated at 100mA with an maximum emitter base voltage of 5V. This transistor has a collector emitter voltage of 45V and a collector base voltage of 50V. This transistor can operate with 150*C.
  • When this transistor is in biased condition, then it can allow a maximum current of 100mA across CE(Collector Emitter) Junction, this state of the transistor is called the saturation state and driving a load that consumes more current than 100mA may damage the device in this condition. As you already may know a transistor is a current controlled device so when base current is removed the transistor becomes fully off, in this stage the transistor is working in its Cut-off Region and the Base Emitter voltage could be around 660 mV.


  • Switching relates and LEds
  • PWM driven application
  • LED dimmers or flashers
  • Switching Applications
  • Preamplifier for Power Amplifier
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