BC548 Transistor – NPN, 30V, 100mA, TO-92, Amplifier ( PDF )

What is BC548 Transistor?

This is 30V, 100mA, NPN Transistor. It is a popular and widely used bipolar junction transistor (BJT) with NPN polarity.

1. This is an NPN transistor, meaning it has a negative-positive-negative structure with a P-type layer sandwiched between two N-type layers.

2. It has a maximum voltage rating of 30V and a maximum current rating of 100mA, making it suitable for low-power applications.

3. It has a high current gain (hFE) of up to 800, which makes it useful for applications where high amplification is required.

The Part Number is BC548.

The function of this transistor is General Purpose Amplifier.

Manufacturer: Motorola

See the preview image and the BC548 datasheet file for more information.


BC548 transistor


This is 30V, 0.1A, NPN Silicon Epitaxial Planar Transistor. This is commonly used in low-power amplifiers, signal processing circuits, and switching circuits. It is also used in oscillator circuits, voltage regulators, and LED drivers.

Advantages Vs Disadvantages

1. It is a low-cost transistor that is readily available and widely used in electronic circuits.

2. Its high current gain makes it useful for applications where amplification is needed, such as in audio amplifiers and signal amplifiers.

3. It is compatible with a wide range of voltage levels and can be used in a variety of electronic circuits.


1. It is a low-power transistor and cannot handle high current or voltage levels, limiting its use in high-power applications.

2. Its maximum frequency response is limited to around 300 MHz, which makes it unsuitable for high-frequency applications such as radio frequency circuits.

3. It has a relatively low collector-emitter breakdown voltage (VCEO) of 30V, which limits its use in circuits that require higher voltage levels.



1. General Transistor.

BC548 pinout

BC548 datasheet

Absolute maximum ratings ( Ta=25°C )

1. Collector to Base Voltage: Vcbo = 30 V

2. Collector to Emitter Voltage: Vceo = 30 V

3. Emitter to Base Voltage: Vebo = 6 V

4. Collector Current: Ic = 100 mA

5. Total Dissipation : Pc = 625 MW

6. Junction Temperature: Tj = 150°C

7. Storage Temperature: Tsg = -55 ~ +150°C

BC548 Transistor Datasheet

BC548 pdf


BC548 vs BC547

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