BC549 Transistor (30V, 0.1A)

Overview

The BC549 is a versatile NPN bipolar junction transistor (BJT) housed in a compact TO-92 package. Designed for general-purpose amplification and switching, it delivers reliable performance for a wide range of low-power electronic projects. Whether you're building audio preamplifiers, signal conditioning circuits, or simple switches, the BC549 offers a balanced combination of current gain and switching speed, making it a staple in any maker's component kit.

Key Features

• NPN Silicon Transistor – Ideal for low-power amplification and switching.
• High Current Gain (hFE) – Typically ranges from 110 to 800, ensuring strong signal amplification.
• Low Noise – Suitable for audio and sensitive signal applications.
• Compact TO-92 Package – Easy to mount on breadboards and PCBs.
• Wide Operating Temperature – Reliable performance from -55°C to +150°C.
• RoHS Compliant – Environmentally friendly lead-free construction.

Technical Specifications

• Type: NPN
• Collector-Emitter Voltage (Vceo): 30V
• Collector Current (Ic): 0.1A (100mA)
• DC Current Gain (hFE): 110 – 800 (typical 420)
• Transition Frequency (ft): 100 MHz
• Power Dissipation (Ptot): 500mW
• Package: TO-92
• Operating Temperature Range: -55°C to +150°C

Applications & Use Cases

• Audio Amplification: Preamplifiers, microphone preamps, and small-signal audio stages.
• Switching Circuits: Low-power relay drivers, LED drivers, and logic-level shifting.
• Signal Processing: Sensor interfaces, oscillators, and voltage regulators.
• Educational Projects: Ideal for learning transistor fundamentals and circuit design.
• DIY Electronics: Hobbyist projects, robotics, and prototyping.

What's Included

• 1 x BC549 Transistor – NPN, TO-92 package

Compatibility

• Pin Configuration: Standard TO-92 pinout (Emitter, Base, Collector) – compatible with most breadboards and PCBs.
• Circuit Compatibility: Can replace other general-purpose NPN transistors such as BC547, BC548, and 2N3904 in most low-power applications (check pinout and ratings).
• Development Boards: Works seamlessly with Arduino, Raspberry Pi, and other microcontrollers for signal interfacing.

MOKWN Recommendation

For Egyptian makers, students, and engineers, the BC549 is an essential component for building and testing a variety of electronic circuits. Its low cost, wide availability, and proven reliability make it a smart choice for both educational and practical projects. Stock up on BC549 transistors to keep your prototyping bench ready for any challenge.