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PNP Transistor – BC327

🛠️ PNP Transistor – BC327 (TO‑92 Package)

Overview

The BC327 is a reliable PNP bipolar transistor designed for general-purpose switching and amplification tasks. With a current rating of up to 800 mA, voltage tolerance up to 45 V, and low noise characteristics, it excels in audio circuits, microcontroller interfaces, and push-pull amplifier stages 

Key Features

  • PNP silicon transistor in TO‑92 package

  • Current capacity: –800 mA

  • Voltage ratings: V<sub>CEO</sub> –45 V, V<sub>CBO</sub> –50 V, V<sub>EBO</sub> –5 V

  • Power dissipation: 625 mW

  • DC current gain (h<sub>FE</sub>): 100–630 depending on variant

  • Transition frequency (f<sub>T</sub>): ~100 MHz

  • Noise-reducing design suited for audio use 

(Flat side facing you, leads downward):

  1. Collector

  2. Base

  3. Emitter 

Typical Arduino Wiring (High-Side PNP Switch)

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Emitter → +V supply  
Collector → Load → GND  
Base → Arduino digital pin via 1 kΩ resistor

  • Pull the base LOW to turn ON the transistor

  • Use a flyback diode across inductive loads (e.g., motors, relays)

  • Ensure shared ground/reference between circuits

Applications

  • High-side switching of DC loads

  • PNP stage in complementary push-pull audio amplifiers (pairs with BC337/BC338)

  • Relay and LED control

  • Audio preamp and buffer circuits

  • Sensor activation circuits

✅ Resources

3.00 LE 3.00 LE

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Transistor PNP Transistor