2N4124

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General-purpose NPN silicon small-signal bipolar junction transistor (BJT) housed in a plastic TO-92 package, engineered as an economy, medium-gain voltage amplifier or low-power s aturated switch. Equivalents: 2N4123, BC547, NTE123A. Real-Life Examples: Vintage tabletop AM/FM clock radios, handheld electronic toy logic nodes, and consumer device status indicators. Show more