2N4400

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General-purpose NPN silicon small-signal bipolar junction transistor (BJT) housed in a plastic TO-92 package, designed as an economy, medium-gain voltage amplifier or saturated swi tch for consumer electronics. Equivalents: BC547, PN4400, NTE123A. Real-Life Examples: Tabletop AM/FM radios, retro electronic toy control circuits, and commercial diagnostic status indicators. Show more