Transistor PNP 2N3906

🛠️ PNP Transistor – 2N3906 (TO‑92 Package)

Overview

The 2N3906 is a versatile PNP bipolar junction transistor widely used for switching and amplifier applications in low-power electronic circuits. It serves as the PNP complement to the 2N3904 and is well-suited for hobbyist and audio projects 

Key Features

• Collector current: up to 200 mA

• Collector–Emitter voltage: up to 40 V

• Collector–Base voltage: up to 60 V

• Power dissipation: ~300 mW (ambient)

• DC current gain (hₙE): 100–300

• Transition frequency (fₜ): ~200–300 MHz

• Package: TO‑92 (flat front, plastic body) 

Pinout

(Flat side facing you, leads downward)

1. Emitter (P-side, positive)

2. Base (control)

3. Collector (negative/load side)

Typical Arduino Switching Setup

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

Applications

• Driving LEDs, small motors, and relays in PNP configuration

• Audio signal amplification and simple preamps

• Part of push-pull amplifier stages with 2N3904

• Switching circuits in sensors and logic

• Timing/oscillator circuits

✅ Resources

1. 📄 Datasheet: 2N3906 small-signal PNP transistor (ON Semiconductor) theengineeringprojects.com+15onsemi.com+15goodarksemi.com+15

2. 🎥 YouTube Tutorial:https://youtu.be/NjD7eUZIg1U?si=5Ta5AItrJYfec95b