PN2222

The PN2222 is a widely used NPN bipolar junction transistor. It is a general-purpose device commonly found in electronic circuits for amplification and switching applications. Its popularity stems from its affordability, availability, and suitable electrical characteristics for many common tasks.

Key parameters of the PN2222 include a maximum collector current (Ic) of 800 mA and a collector-emitter voltage (Vce) of 40 V. It has a DC current gain (hFE) that typically ranges from 100 to 300, depending on the specific variant and operating conditions. The transistor is housed in a TO-92 plastic package, which is small and easy to handle on printed circuit boards.

The PN2222 is well-suited for low-power amplification, such as in audio preamplifiers or signal conditioning circuits. It can also function effectively as a switch, controlling the flow of current to loads like LEDs or small relays. Its versatility makes it a staple component for hobbyists and engineers alike, often appearing in educational kits and experimental projects. While newer, more specialized transistors exist, the PN2222 remains a reliable and cost-effective choice for many basic electronic designs.