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BC557 PNP Transistor – General Purpose Low Power Amplifier & Switching Transistor
The BC557 is a widely used PNP (positive-negative-positive) bipolar junction transistor (BJT), designed for general-purpose amplification and switching applications. It is similar to the BC547 (NPN type), but the BC557 is a PNP transistor, meaning that it has opposite polarity and is used in different types of circuits. The BC557 is a popular PNP bipolar junction transistor (BJT) used for low-power amplification and switching in electronic circuits. Packaged in a compact TO-92 form, it's ideal for hobby electronics, signal processing, analog circuits, and Arduino/IoT interfacing.
₹ 3 ₹5
5
Key Features:
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PNP-type general-purpose BJT transistor
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Low-power signal amplifier and switch
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Collector current (Ic): 100 mA max
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Collector-Emitter voltage (Vce): -45V max
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Compact and breadboard-friendly TO-92 package
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Widely used in amplifier stages, Arduino I/O, and DIY electronics
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Compatible with BC547 (NPN) for complementary circuits
Product Description (Detailed):
The BC557 PNP transistor is a general-purpose BJT used in analog signal amplification, low-power switching, and digital logic control applications. It works by conducting when the base is pulled low relative to the emitter, making it perfect for circuits where a low logic signal triggers an output.
This transistor is widely used in sensor circuits, logic inverters, audio pre-amplifiers, and low current load switching, especially in conjunction with microcontrollers like Arduino, PIC, or STM32. Its high current gain (hFE) and compact design make it ideal for educational, commercial, and prototyping purposes.
Technical Specifications:
| Parameter | Specification |
|---|---|
| Transistor Type | PNP |
| Package Type | TO-92 (through-hole) |
| Collector-Emitter Voltage | -45V |
| Collector-Base Voltage | -50V |
| Emitter-Base Voltage | -5V |
| Collector Current (Ic max) | -100 mA |
| Power Dissipation (Pd max) | 500 mW |
| DC Current Gain (hFE) | 110 to 800 (varies by batch) |
| Transition Frequency (fT) | 150 MHz (typical) |
| Operating Temperature Range | -65°C to +150°C |
| Lead Pitch | ~2.54mm (standard breadboard compatible) |
How to Use:
Pin Configuration (TO-92 Package):
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Pin 1 – Collector
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Pin 2 – Base
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Pin 3 – Emitter
Flat face toward you, pins facing downward (from left to right: Collector, Base, Emitter)
Typical Use Cases:
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Switching applications (relay driving, LED control)
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Low-noise audio amplification
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Analog signal amplification
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Inverter logic circuits
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Arduino sensor interfacing (PNP configuration)
Applications:
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Analog audio circuits
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Digital logic level shifting
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Low current LED and relay drivers
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Sensor signal inversion
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Hobby electronics & STEM education kits
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DIY Arduino, Raspberry Pi, and microcontroller projects
Package Includes:
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1× BC557 PNP Transistor
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