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Transistor NPN 2N2222

🛠️ NPN Transistor – 2N2222 (TO‑92)

Overview

The 2N2222 is a general-purpose silicon NPN transistor, widely used for switching and amplification in low-power electronics. It supports up to 800 mA current and 40 V V<sub>CE</sub>, making it perfect for interfacing microcontrollers with LEDs, relays, motors, and sensors.

Key Features

  • NPN silicon bipolar transistor

  • Collector current: up to 800 mA

  • Collector‑emitter voltage: 40 V

  • Power dissipation around 625 mW

  • High current gain (h<sub>FE</sub>): ~100–300

  • Fast switching speed, f<sub>T</sub> up to ~300 MHz

  • Standard TO‑92 plastic package

Pinout (Flat Face Forward, Leads Down):

  1. Emitter (left)

  2. Base (middle)

  3. Collector (right) 

Typical Arduino Switching Circuit

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

  • Add a flyback diode across inductive loads

✅ Resources

  1. 📄 Datasheet: 2N2222A/P2N2222A (NPN Transistor) – V<sub>CE</sub> 40 V, I<sub>C</sub> 600–800 mA, power 625 mW

  2. 🎥 YouTube Tutorial: How to use the 2N2222 NPN transistor as a switch – Arduino LED control example amazon.com+14youtube.com+14docs.cirkitdesigner.com+14

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Transistor npn Transistor