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BC557 PNP General Purpose Transistor (TO-92 Package)
The BC557 PNP General Purpose Transistor in a standard TO-92 through-hole package is a widely used low-power silicon epitaxial planar bipolar junction transistor (BJT). Featuring a maximum collector current (IC) of 100mA and a collector-emitter breakdown voltage (V_CEO) of -45V, it is specifically designed for low-noise audio preamplifiers, signal processing, small load switching, and complementary symmetry driver stages when paired with NPN transistors like the BC547. Its high DC current gain (h_FE) and low noise output make it an indispensable component for microcontroller interface circuits, sensor signal amplification, and DIY hobbyist electronics projects.
₹ 2
₹ 5
This transistor is designed to handle small current loads and signal amplification with stable performance in low-power circuits.
Key Features
- PNP type general-purpose transistor
- Suitable for switching and amplification
- Low noise and stable performance
- High current gain (hFE)
- Easy to use in breadboard and PCB circuits
- Compatible with Arduino and microcontroller projects
- Low power consumption
- Widely available and cost-effective
Technical Specifications
| Parameter | Specification |
|---|---|
| Transistor Type | PNP |
| Model | BC557 |
| Package Type | TO-92 (DIP-style) |
| Collector Current (Ic) | Up to 100 mA |
| Collector-Emitter Voltage | -45V (max) |
| Power Dissipation | ~500 mW |
| DC Current Gain (hFE) | 110 – 800 (typical range) |
| Operating Mode | Switching / Amplification |
| Frequency Range | Low to medium frequency applications |
How to Use
- Identify pins: Emitter, Base, Collector
- Connect emitter to positive supply (for PNP operation)
- Use base resistor for current control
- Connect load to collector side
- Apply low signal to base to switch ON/OFF
- Test in switching or amplification circuit
Applications
- Relay driver circuits
- Signal amplification stages
- Sensor interface circuits
- LED switching applications
- Arduino and microcontroller projects
- Audio pre-amplifier circuits
- Logic switching circuits
Package Includes
1 * BC557 Transistor PNP – General Purpose Low Power Amplifier & Switching Transistor
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