2N4401

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Highly ubiquitous classic NPN silicon switching and general-purpose small-signal amplification transistor housed in a plastic TO-92 package, globally utilized for fast switching up to 500mA and general audio frequency gain. Equivalents: PN4401, 2N3904 (lower current variant), KN4401, NTE123A. Real-Life Examples: Microcontroller I/O relay and LED driver lines, switching power supply feedback regulation loops, guitar effects pedal buffer circuits, and automated alarm sensor logic panels. Show more