BC547 NPN General-Purpose Transistor – TO-92 Package
Product Description
The BC547 is a widely used NPN bipolar junction transistor suitable for low-power switching and signal-amplification applications. It can be controlled using a small base current, allowing it to switch devices such as LEDs, buzzers and small electronic loads.
Its compact TO-92 package makes it suitable for breadboards, PCB circuits, Arduino projects, electronic prototypes and educational experiments.
Key Features
- General-purpose NPN transistor
- Suitable for switching and amplification
- Compact TO-92 through-hole package
- Low-power operation
- Easy to use in breadboard and PCB circuits
- Compatible with microcontroller-based projects
- Useful for educational and DIY electronics
Technical Specifications
| Parameter | Specification |
|---|---|
| Transistor type | NPN BJT |
| Part number | BC547 |
| Package | TO-92 |
| Maximum collector-emitter voltage | 45V |
| Maximum collector current | 100mA |
| Maximum power dissipation | Approximately 500mW |
| DC current gain | Varies by device grade |
| Operating junction temperature | Up to 150°C |
| Mounting type | Through-hole |
Pin Configuration
When viewing the transistor’s flat side with the leads pointing downward, the common pin arrangement is:
- Collector
- Base
- Emitter
Always verify the manufacturer’s datasheet or supplied component markings before connecting, as the pin arrangement may differ between brands.
Common Applications
- LED switching circuits
- Small relay-driver circuits
- Signal amplification
- Buzzer control
- Oscillator circuits
- Sensor-interface circuits
- Arduino and microcontroller projects
- DIY electronics and student experiments
Package Contents
- 1 × BC547 NPN Transistor
Important Note
The BC547 is intended for low-current loads. Use a suitable current-limiting base resistor and a flyback diode when controlling an inductive load such as a relay.
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