BC547 NPN General Purpose Transistor TO-92 Through Hole 45V 100mA

BC547 NPN General Purpose Transistor – TO-92 Through Hole (45V, 100mA)

The BC547 is one of the most popular NPN general-purpose transistors in electronics, housed in the compact TO-92 package. With a collector-emitter voltage of 45V and a maximum collector current of 100mA, it handles a wide range of low-power switching and amplification tasks with ease.

Key Specifications

• Type: NPN Bipolar Junction Transistor (BJT)
• Package: TO-92 (Through Hole)
• Collector-Emitter Voltage (V₀₀₀): 45V
• Collector-Base Voltage (V₀₀₀): 50V
• Emitter-Base Voltage (V₀₀₀): 6V
• Collector Current (I₀): 100mA max
• DC Current Gain (h₀₀): 110–800
• Power Dissipation: 500mW

Compatibility & Use Cases

The BC547 is the NPN complement to the BC557 and works seamlessly with Arduino, ESP32, and other 3.3V/5V microcontrollers for digital switching and analog amplification. Common applications include:

• LED and buzzer driver circuits
• Relay switching from low-current GPIO pins
• Audio preamplifier and signal amplification stages
• Sensor signal conditioning and level shifting
• IoT device power switching and sleep-mode control

An essential transistor for every electronics component kit — from beginners to professionals.

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