BC546 NPN Transistor — TO-92 Package ⚙️

The BC546 is a reliable, general-purpose NPN epitaxial silicon transistor in a compact TO-92 package. Designed for low-noise amplification and efficient switching, it is an ideal choice for both electronics engineers and DIY hobbyists. Use it in analog front-ends, sensor interfaces, and control stages for other microcontroller-based projects.

Key Features 🔎

• NPN epitaxial silicon transistor for general-purpose use
• High voltage rating: up to 65 V (Vceo)
• Low noise performance — suitable for audio amplification
• High current gain (hFE): ~110 at 2 mA
• Power dissipation: up to 500 mW (at 25°C)
• Convenient TO-92 through-hole package for easy prototyping

Technical Specifications 📐

• Collector–Emitter Voltage (Vceo): 65 V
• Collector–Base Voltage (Vcbo): 80 V
• Emitter–Base Voltage (Vebo): 6 V
• Collector Current (Ic): 100 mA
• Power Dissipation (Pd): 500 mW
• DC Current Gain (hFE): ~110 at 2 mA
• Package: TO-92, through-hole

Note: All values are typical unless otherwise specified. Verify limits against the manufacturer’s datasheet for your specific lot and operating conditions.

Pin Configuration 🔌

Typical TO-92 orientation (flat side facing you): C–B–E. Always confirm the pinout in the component’s datasheet, as it may vary by manufacturer.

Possible Applications 🧰

• Audio amplifiers and preamp stages
• Signal processing and small-signal gain blocks
• General-purpose switching up to 100 mA
• Level shifting and inversion in microcontroller circuits
• Interfaces for electronics modules

Design Tips 💡

• Use an appropriate base resistor to set bias or switching current.
• Maintain safe voltage, current, and power dissipation margins.
• For lowest noise in audio paths, optimize biasing and minimize source impedance.
• Consider hFE variation across device grades; design with adequate margin.

Datasheet 📄