BC557 PNP General Purpose Transistor TO-92 Through Hole 45V 100mA

BC557 PNP General Purpose Transistor – TO-92 Through Hole (45V, 100mA)

The BC557 is a widely used PNP general-purpose transistor in the compact TO-92 package. With a collector-emitter voltage of 45V and a maximum collector current of 100mA, it is ideal for low-power switching and signal amplification in a broad range of analog and digital circuits.

Key Specifications

• Type: PNP Bipolar Junction Transistor (BJT)
• Package: TO-92 (Through Hole)
• Collector-Emitter Voltage (V₀₀₀): 45V
• Collector-Base Voltage (V₀₀₀): 50V
• Emitter-Base Voltage (V₀₀₀): 5V
• Collector Current (I₀): 100mA max
• DC Current Gain (h₀₀): 110–800
• Power Dissipation: 500mW

Compatibility & Use Cases

The BC557 is the PNP complement to the BC547 and pairs naturally with Arduino, ESP32, and other 3.3V/5V microcontrollers for low-side and high-side switching. Common applications include:

• LED and relay driver circuits (active-low switching)
• Audio preamplifier and signal conditioning stages
• Complementary push-pull amplifier designs
• Sensor signal inversion and level shifting
• IoT device power management and sleep-mode control

A must-have transistor for any electronics component kit.

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