BC557 Transistor (45V, 0.1A)

Overview

The BC557 is a reliable PNP bipolar junction transistor (BJT) housed in a compact TO-92 package. It is designed for general-purpose amplification and switching applications where a low-power PNP transistor is required. With a collector-emitter voltage rating of 45V and a continuous collector current of 0.1A (100mA), the BC557 is a versatile component for a wide range of electronic projects, from simple LED drivers to audio preamplifiers.

Key Features

• PNP Transistor: Suitable for applications where a negative polarity (PNP) transistor is needed.
• 45V Collector-Emitter Voltage (VCEO): Handles moderate voltage levels.
• 100mA Collector Current (IC): Capable of driving small loads.
• TO-92 Package: Standard through-hole package, easy to use on breadboards and PCBs.
• Low Power Dissipation: Ideal for low-power, portable circuits.
• High Current Gain (hFE): Typically 125-800, providing good amplification.
• RoHS Compliant: Environmentally friendly.

Technical Specifications

• Type: PNP
• Collector-Emitter Voltage (VCEO): 45V
• Collector-Base Voltage (VCBO): 50V
• Emitter-Base Voltage (VEBO): 5V
• Collector Current (IC): 100mA (0.1A)
• Power Dissipation (PD): 500mW
• DC Current Gain (hFE): 125 to 800 (at IC = 10mA)
• Transition Frequency (fT): 100MHz
• Operating Temperature Range: -55°C to +150°C
• Package: TO-92

Applications & Use Cases

• Signal Amplification: Audio preamplifiers, sensor signal conditioning.
• Switching Circuits: Driving LEDs, relays, and small DC motors.
• Complementary Pair: Often used with NPN transistors like BC547 for push-pull amplifier stages.
• Current Sinking: Useful in circuits where the load is connected to the positive rail.
• Hobbyist Projects: Ideal for educational kits, robotics, and DIY electronics.

What's Included

• 1x BC557 Transistor (PNP, 45V, 0.1A) – TO-92 package

Compatibility

• Complementary NPN: BC547
• Common Replacements: 2N3906, 2SA1015 (check pinout)
• Works with: Breadboards, PCBs, standard prototyping tools.

MOKWN Recommendation

The BC557 is a must-have for any electronics enthusiast or professional. Its low cost and high reliability make it perfect for learning about transistor circuits or for production runs. Whether you're building a signal amplifier, a switching circuit, or a robotics project, the BC557 offers dependable performance. Stock up today and keep your projects moving!