The BC547 is a widely used NPN bipolar junction transistor (BJT), designed for general-purpose low-current and medium-voltage applications. Encased in a compact TO-92 package, this transistor is suitable for switching, amplification, and signal processing tasks, making it a popular choice among students, hobbyists, and professionals.
With a maximum collector current (Ic) of 300mA and a collector-emitter voltage (Vce) of 50V, the BC547 can effectively drive small loads such as LEDs, buzzers, small relays, or interface low-power electronic circuits. It also exhibits a DC current gain (hFE) ranging from 110 to 800, depending on the variant, making it well-suited for use in signal amplification circuits.
Thanks to its low noise performance, the BC547 is often used in audio preamplifiers, RF circuits, and sensor interfaces, ensuring clean and reliable signal handling. In switching applications, the transistor can operate in the saturation and cut-off regions, providing efficient on/off control for logic circuits and microcontroller outputs.
Key Features:
- Type: NPN Bipolar Junction Transistor
- Package: TO-92 (through-hole)
- Collector-Emitter Voltage (Vce): 50V
- Collector Current (Ic): 0.3A (300mA) max
- DC Gain (hFE): 110–800 (depending on version A, B, or C)
- Low noise characteristics – ideal for audio and RF circuits
- Power dissipation (Ptot): ~500mW
- Transition frequency (fT): ~300 MHz
Applications:
- Signal amplification (audio, low-frequency, RF circuits)
- Low-power switching applications
- Driving LEDs, buzzers, and small relays
- Interfacing sensors with microcontrollers
- DIY electronic projects and educational circuits
- Logic switching and signal processing
Package Type: TO-92
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