BC550 Datasheet – 45V, 100mA, NPN Transistor

This is one of the most commonly used NPN transistor types.

Part Number: BC550

Function: 45V, 100mA, NPN Transistor

Package: TO-92 Type

Manufacturer: Fairchild Semiconductor Corporation, a semiconductor manufacturing company, was acquired by ON Semiconductor Corporation on September 18, 2016.

For additional details, please refer to the preview image and the accompanying PDF file.


BC550 datasheet pinout

What is BC550?

This is a maximum voltage rating of 45V and a maximum current rating of 100mA, NPN general-purpose transistors in small plastic packages. It is widely used in applications such as signal amplification, switching, and oscillator circuits.

The BC550 is a general-purpose NPN bipolar junction transistor (BJT) that is commonly used in electronic circuits due to its low cost and wide availability.



0. Switching and Amplifier

1. Low current

2. Low voltage

3. Three different gain selections

4. Low-Noise


1. It is a versatile transistor that can be used in a wide range of general-purpose applications.

2. It has a low collector-emitter saturation voltage, which reduces power loss and improves efficiency.

3. Its small TO-92 package makes it easy to use and suitable for applications where space is limited.


1. It is designed for low-power applications and may not be suitable for high-power circuits.

2. Its maximum current rating of 100mA may be too low for some applications.

Absolute maximum ratings ( Ta=25°C )

1. Collector to Base Voltage: Vcbo = 50 V

2. Collector to Emitter Voltage: Vceo = 45 V

3. Emitter to Base Voltage: Vebo = 5 V

4. Collector Current: Ic = 100 mA

5. Collector Power Dissipation : Pc = 500 mW

6. Junction Temperature: Tj = 150°C

7. Storage Temperature: Tsg = -65 ~ +150°C


1. General-purpose switching and amplification


Q1: What is the difference between BC550 and BC547 transistors?

A1: The BC550 and BC547 are both NPN BJTs, but the BC550 has a higher maximum voltage rating of 45V compared to the BC547’s 30V rating. Additionally, the BC550 is typically used in low-power applications, while the BC547 can be used in both low-power and medium-power circuits.

Q2: Can this transistor be used as a switch?

A2: Yes, It can be used as a switch in low-power applications. However, its maximum current rating of 100mA may limit its use in some switching applications.

Other data sheets are available within the file: BC546, BC547, BC548, BC549

BC550 Datasheet PDF

BC847 pdf

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