The 2N2222A is one of the most popular and widely used NPN bipolar junction transistors (BJTs) in electronics. It’s ideal for switching and small-signal amplification in Arduino, IoT, and general electronics projects.
 
Key Specifications (Typical)
Type: NPN
Package: TO-92 (plastic) or TO-18 (metal can)
Collector-Emitter Voltage (Vce max): 40 V
Collector Current (Ic max): 600 mA
Power Dissipation: ~500 mW
DC Gain (hFE): 75 – 300
Transition Frequency (fT): ~250 MHz
Operating Temperature: -55°C to +150°C