BC557 PNP Transistor – General Purpose Amplifier & Switch (TO-92 Package)
The BC557 is a popular PNP bipolar junction transistor (BJT) designed for low-power switching and signal amplification applications. It is widely used in analog and digital circuits, making it ideal for use with Arduino, Raspberry Pi, and other microcontroller platforms. Its TO-92 package makes it easy to use on breadboards and PCBs.
 
Key Features:
PNP Transistor
Conducts when base is low; used for switching and signal amplification.
Collector Current up to 100 mA
Suitable for controlling LEDs, sensors, and small relays.
High DC Current Gain (hFE)
Enables signal boosting in analog and audio circuits.
Low Noise Operation
Reliable for use in low-noise and high-gain amplifier designs.
Compact TO-92 Package
Ideal for prototyping and educational use.
 
Applications:
Signal amplification in analog circuits
Low-power switching with microcontrollers
Audio preamplifiers
Complementary use with BC547 (NPN)
DIY electronics and robotics
Sensor interfacing and level shifting
 
Package Includes:
1 × BC557 PNP Transistor
 
Specifications:
Transistor Type: PNP
Max Collector Current (Ic): 100 mA
Collector-Emitter Voltage (Vce): -45 V
Collector-Base Voltage (Vcb): -50 V
Emitter-Base Voltage (Veb): -5 V
DC Gain (hFE): 110 to 800
Package Type: TO-92
Mounting Type: Through-hole
 
Dimensions:
Body Length: 5 mm
Body Width: 4 mm
Lead Length: 14 mm
 
Weight: 0.2 g
 
People Also Search For:
BC557 PNP transistor
TO-92 PNP BJT
BC557 vs BC547
PNP transistor for Arduino
Low-power amplifier transistor
General purpose PNP switch
BC557B, BC557C variants
Analog circuit PNP transistor
 
Shipping Weight - 20 grams