Transistor PNP 2N2907

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🛠️ PNP Transistor – 2N2907 (TO‑92 / TO‑18)

Overview

The 2N2907 is a widely used general-purpose PNP transistor, ideal for switching and amplification in low-power electronics. It's the PNP complement to the popular NPN 2N2222, commonly used with microcontrollers and discrete circuits 

Pinout (Flat face facing you, leads down)

1. Emitter (P-side, positive)

2. Base

3. Collector (N-side, negative toward load) 

Typical Wiring – Arduino Switching

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Emitter → +V supply  
Collector → Load → GND  
Base → Arduino digital pin → resistor (~1 kΩ)

• Pull base low (towards emitter) to turn transistor ON

• Include a flyback diode across inductive loads (motors, relays)

• Ensure Arduino ground and +V share a common reference

Applications

• Low-side switching of small motors, lamps, relays

• Audio and sensor signal amplification

• Part of push-pull stages when paired with 2N2222

• Timing circuits, oscillators

• Mixed-signal and logic-level interfacing

✅ Resources

1. 📄 Datasheet (NXP / ON Semiconductor) – PNP switching transistor with details: 600 mA, 40 V, 200 MHz performance forum.arduino.cc+7circuits-diy.com+7theengineeringknowledge.com+7componentsinfo.com+6alldatasheet.com+6datasheet4u.com+6

2. 🎥 YouTube Tutorial:   https://youtu.be/EiD8tLbXLRY?si=rLI0tZn2MYppszz9