2N3904 NPN General Purpose Transistor

The 2N3904 is a classic general-purpose NPN transistor found in countless switching circuits across hobbyist electronics, TVs, and other consumer appliances. With a high DC current gain of up to 300, it amplifies small signals effectively while remaining simple and inexpensive to work with on any beginner or intermediate project.

Its maximum collector current of 200mA makes it well suited to driving small loads like LED modules and relay modules directly, or acting as a switch in a larger circuit built around a microcontroller. Available in the standard TO-92 package, the 2N3904 is a dependable component to keep in any electronics parts bin, whether you are building a simple LED driver or experimenting with basic amplifier configurations.

• General-purpose NPN transistor – suited to switching applications
• High DC current gain – up to 300 for effective amplification
• Maximum collector current – 200mA
• Collector-emitter voltage – rated up to 40V
• TO-92 package – easy to use on breadboards and PCBs
• Common applications – relay drivers, LED modules, TV circuits

Add a dependable switching component to your project with the 2N3904 NPN General Purpose Transistor.