2N5305

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High-gain NPN silicon planar Darlington phototransistor or high-gain amplifier pair housed in a plastic TO-92 package, engineered to deliver ultra-high current gain (hFE typically over 10,000) from weak input signals. Equivalents: 2N5308, MPSA13, BC517, NTE172. Real-Life Examples: Touch-sensitive electronic switches, high-sensitivity light/proximity sensors, time-delay relay circuits, and audio input buffers. Show more