The BC108 is a general-purpose low-power silicon transistor. It is a low-power silicon NPN bipolar junction transistor. It is mostly used as a transistor in almost all types of electronics projects and equipment.  BC106 and BC107 are the same as BC108. Moreover, this transistor can be used as a switch and drive load of up to 100mA.

The BC547 is a modern low-cost member of this family, still in a through-hole package, while the BC847 is the surface-mount version.

BC108 transistor pinout

BC108 bipolar transistor pinout

Characteristics of the BC108 bipolar transistor

  • Type – NPN type
  • Type Designator: BC108
  • The material of the Transistor: Si
  • Maximum Collector-Base Voltage |Vcb|: 30 V
  • Max Collector-Emitter Voltage: 20V
  • Max Emitter-Base Voltage: 5V
  • Collector Current: 0.1A
  • Collector Dissipation: 0.3 W
  • DC Current Gain max:110 to 800
  • Transition Frequency:150 MHz
  • Operating Junction Temperature Max (Tj): 175 °C
  • Noise Figure – 2 dB
  • Operating and Storage Junction Temperature Range -65 to +175 °C
  • Package: TO18

BC106 BC107 and BC109  are low noise general purpose amplifiers description. They are silicon-type metal case transistors. They are fit for use in driver stages, low noise input stages, and signal processing circuits.

Equivalent of BC108

you can replace it with BC547 Transistor Because BC547 is easily and low-cost equivalent of this transistor.

SMD Equivalent of BC108 Transistor

SMD version of the BC109 is MMBTH10 (SOT-23)

Complementary PNP transistor

BC177, BC178, and BC179 are the compliment of BC10

Application of BC108 Transistor

  • Switch circuits/projects
  • Low noise signal processing
  • Input stages to build low-noise circuits
  • RF projects/circuits
  • Darlington pairs

Absolute Maximum Ratings

To use it safely and to increase the life of the transistor do not use it on its absolute MAX ratings and always stay 10% below. The maximum collector current is 100mA so do not drive a load of more than 80mA. The max collector-to-emitter voltage is 20V so remains below 20V. The temperature should not go above -65 °C and below 150°C.


The Datasheet of BC108 NPN transistor is given below please open the given link in a new tab of your browser.