2N3904 NPN Transistor

The 2N3904 is a widely used NPN bipolar junction transistor (BJT) designed for general-purpose low-power amplification and switching applications. Enclosed in a standard TO-92 plastic package, this silicon transistor is a staple in electronics prototyping, hobbyist kits, and commercial circuits. It features a maximum collector-emitter voltage of 40V and a continuous collector current of 200mA, making it suitable for driving relays, LEDs, and other low-power loads. With a high DC current gain (hFE) typically up to 300, it offers excellent amplification capabilities for signal processing. Common applications include audio pre-amplifiers, sensor interfaces, logic level shifting, and switching circuits. This transistor is known for its reliability, affordability, and ease of use, making it an essential component for students, hobbyists, and engineers alike. Choose the 2N3904 for your next project for proven performance and widespread availability.