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BC550 Transistor pinout features

In this article we are going to explain the transistor BC550 pinout, features, data sheet alternate, compliment and other detail. Transistor BC550 is general purpose BJT transistor of BC547 series. The transistors in this series are commonly used for wide purpose applications in commercial devices and also in academic and hobby electronic projects.

BC550 Pinout and Diagram Configuration

Pin Number

Pin Name




Electrons Emitted from Emitter Collected by the Collector



Controles the biasing of the transistor



Electrons emitted from the emitter into the first PN junction

BC550 Transistor Pinout features and other detail

Characteristics of BC550 transistor

  • Type - NPN
  • Package - TO-92
  • Max Collector-Emitter Voltage: 45 V
  • Max Collector-Base Voltage: 50 V
  • Emitter-Base Voltage Max: 5 V
  • MaxCollector Current: 0.1 A
  • MaxCollector Dissipation - 0.5 W
  • DC Current Gain (hfe) - 110 to 800
  • TFrequency of transistor - 150 MHz
  • Noise Figure - 1.2 dB
  • Mamimum and Minimum Operating and Storage Junction Temperature Range -65 to +150 °C

BC550 Transistor Equivalent Transistor

The equivalent or alternate of BC550 are BC547, BC548, BC549, C945, 2S5200, C828, 2N2222 and many other. Pin configuration of alternate transistor may different so, please must check the technical specification and pinoout before using any alternate of BC550 tranistor.

Basic Working of a Transistor

BC550 is a general purpose NPN transistor, in NPN transistor electrons work as the primary charge carriers that are flow from the emitter of the transistor. When a positive voltage is applied to the base of transistor the holes are created to the base of of transistor.

Complement of BC550 Transistor

Complent transistor of BC550 Transistor are BC556, BC557 and BC558.

SMD Equivalent

SMD Equivalent of the BC550 are available as the BC847 (SOT-23), BC847W(SOT-323), BC850 (SOT-23).

Applications of BC550 Transistor

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

Datasheet of BC550

datasheet of bc550 transistor

2D Model and Dimensions

2D modele and dimensions of BC550 is given below in the diagram

2D Model and Dimensions