BC548 NPN Transistor (30V 0.1A)

BC548 NPN Transistor (30V 0.1A) Overview

The BC548 NPN Transistor is a widely used, general-purpose bipolar junction transistor optimized for low-power switching and small-signal amplification. Its combination of moderate voltage rating, good gain, and TO-92 packaging makes it a top choice for students, hobbyists, and engineers working on audio, LED, and signal circuits.

Why choose the BC548

• Reliable low-power performance for switching and amplifier stages
• High practical availability and low cost for prototyping and production
• Multiple gain variants (A, B, C) to match circuit requirements

Key Features

• Type: NPN Bipolar Junction Transistor
• Package: TO-92 (through-hole)
• Maximum Collector-Emitter Voltage (Vce): 30V
• Maximum Collector Current (Ic): 100mA
• DC Current Gain (hFE): typically 110–800 (variant dependent)
• Power Dissipation: 500mW
• Operating Temperature Range: -55°C to +150°C
• Suitable for switching and amplification in low-power circuits

Technical Specifications

• Vce (max): 30V
• Ic (max): 100mA
• hFE: 110 to 800 (depending on A, B, or C variant)
• Power dissipation: 500mW
• Operating temperature: -55°C to +150°C
• Package: TO-92, 3-pin through-hole

Common Configurations and Usage

The BC548 can be used in the three standard transistor configurations depending on the circuit goal:

• Common Emitter — voltage amplification and switching applications
• Common Collector (Emitter Follower) — current buffering and impedance matching
• Common Base — low input impedance amplification and special RF/signal stages

Typical Applications

• Small-signal amplification and preamplifier stages
• Audio amplifier stages and tone circuits
• LED drivers and visual indicators
• Relay drivers for low-current control
• Switching loads up to 100mA
• Educational kits, breadboard prototyping, and DIY electronics

Variants and Compatibility

• Available in variants A, B, and C with progressively higher hFE ranges to suit different gain requirements
• Functionally similar to other small-signal NPN transistors (check datasheets when swapping parts)

Package and Pin Information

Package type: TO-92, 3-pin through-hole. Pin orientation may vary by manufacturer; always verify the exact lead order from the component datasheet or supplier before wiring.

Handling and Thermal Notes

• Maximum power dissipation is 500mW; ensure adequate heat management in continuous high-power use
• Observe standard ESD precautions when handling transistor devices

Ordering and Use Tips

• Select the A, B, or C variant based on required gain (hFE) for your circuit
• For breadboard testing use the TO-92 package for easy insertion and replacement
• Confirm pin orientation from the supplier datasheet to avoid wiring mistakes

Note: Images are for Illustration Purposes Only.