BC548 Transistor, Specifications, Features, Alternatives, Uses & Datasheet


The BC548 is a versatile and widely-used NPN silicon transistor that has found its place in countless electronic circuits. Its popularity stems from its exceptional performance in amplification and switching applications. In this blog post, we’ll get into the BC548’s datasheet, features, specifications, pinout configuration, and formulas, and explore alternatives or equivalents.

Breakdown of BC548 Datasheet:

Let’s start by exploring the dimensions of the BC548 transistor. The BC548 is available in a TO-92 package, which measures approximately 5.18mm in length, 4.45mm in width, and has a height of about 6.10mm. These compact dimensions make it ideal for space-constrained electronic designs.

Features of BC548:

The BC548 boasts an array of features that contribute to its widespread use in electronics:

  1. Low noise performance: BC548 offers low noise amplification, making it suitable for audio applications.
  2. High current gain: With a typical current gain (hFE) of 110-800, the BC548 ensures effective signal amplification.
  3. Wide voltage range: It operates within a voltage range of 20V and can handle currents of up to 100mA.
  4. Reliable switching: The BC548 provides efficient switching capabilities, making it adaptable for various circuit designs.

Specifications of BC548:

Here are some essential specifications of the BC548 transistor, along with their typical minimum and maximum values:

  • Collector-Emitter Voltage (VCEO): 30V (min) – 30V (max)
  • Collector-Base Voltage (VCBO): 30V (min) – 30V (max)
  • Emitter-Base Voltage (VEBO): 5V (min) – 5V (max)
  • Collector Current (IC): 100mA (max)
  • Power Dissipation (PD): 500mW (max)
  • Transition Frequency (fT): 150MHz (typical)

Pinout Configuration of BC548:


  The BC548 features three leads that are essential for its operation:

  • Collector (C): This is the output terminal through which the amplified current flows.
  • Base (B): The input terminal that controls the transistor’s operation.
  • Emitter (E): This terminal regulates the flow of electrons from the emitter to the collector.

Formulas for BC548:

Two vital formulas related to the BC548 are:

  1. Collector Current (IC): IC = hFE * IB
  2. Base Current (IB): IB = (VBE – VBE(off)) / RB

Alternative/Equivalent for BC548:

If you’re looking for alternatives to the BC548, you should consider the 2N3904 or 2N2222 transistors. These transistors offer similar characteristics and can often be used interchangeably in various circuit designs.


The BC548 transistor’s compact size, impressive features, and reliable specifications make it a favorite among electronics enthusiasts and professionals. Whether you’re designing amplifiers, switches, or other electronic circuits, the BC548 proves to be a versatile and dependable component. Understanding its datasheet, features, specifications, and pinout configuration empowers you to make informed choices while incorporating it into your designs.

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