BC557 PNP Transistor (TO-92)

The BC557 is a general-purpose PNP bipolar junction transistor (BJT) widely used in electronic circuits for amplification and switching applications. It is ideal for students, hobbyists, and electronics projects involving Arduino, sensors, LEDs, and low-current control circuits.

Its compact TO-92 package makes it easy to use on breadboards, PCBs, and prototype circuits.

Features

• PNP Bipolar Junction Transistor (BJT)

• General-purpose switching and amplification

• TO-92 package

• Low noise performance

• Easy to solder and breadboard-friendly

• Suitable for educational and DIY electronics projects

Applications

• LED switching

• Signal amplification

• Relay driver circuits

• Sensor interface circuits

• Arduino and microcontroller projects

• Audio circuits

• Electronics learning and prototyping

Specifications

• Model: BC557

• Type: PNP Transistor

• Package: TO-92

• Collector-Emitter Voltage (VCEO): -45V

• Collector Current (IC): -100mA (Max)

• Power Dissipation: 500mW

• Gain (hFE): 110–800 (depending on variant)

Pin Configuration

• Emitter (E)

• Base (B)

• Collector (C)

Package Includes:

• 1 × BC557 PNP Transistor