Transistor BC557
Category: General
₦200.00
The BC557 is a general-purpose PNP bipolar junction transistor (BJT) used for low-power switching and signal amplification. It is the complementary pair to the BC547 and is widely used in analog and digital electronic circuits.
Key Features
General-purpose PNP transistor
Ideal for low-power switching and amplification
Low noise characteristics
High current gain (hFE)
Compact TO-92 package
Complementary to BC547 (NPN)
Reliable and cost-effective
Detailed Description
The BC557 transistor is commonly used in audio amplifier stages, signal conditioning circuits, sensor interfaces, and logic control circuits where a PNP configuration is required. It allows current to flow from the emitter to the collector when a small current is applied to the base.
Due to its stable electrical characteristics and ease of use, the BC557 is popular in educational kits, DIY electronics, and professional circuit designs. When paired with the BC547, it enables push-pull amplifier designs and complementary switching applications.
Technical Specifications
Transistor Type: PNP BJT
Package Type: TO-92
Collector-Emitter Voltage (Vce): −45V
Collector-Base Voltage (Vcb): −50V
Emitter-Base Voltage (Veb): −5V
Collector Current (Ic max): −100mA
Power Dissipation: 500mW
DC Current Gain (hFE): 110 – 800
Operating Temperature: −55°C to +150°C
What’s in the Box
1 × BC557 PNP Transistor
Ideal For
Low-power switching circuits
Audio amplifier stages
Complementary transistor circuits
Microcontroller interface designs
Educational and training kits
DIY electronics projects
Important Note
Always ensure correct polarity and biasing when using a PNP transistor. Use appropriate base resistors to protect the transistor and achieve stable operation.