2N3439

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High-voltage NPN silicon planar small-signal transistor housed in a metal TO-39 can, engineered specifically to withstand severe voltage strain without arcing or breakdown in high- voltage line drivers. Equivalents: 2N3440, MJE340 (plastic alternative), NTE194. Real-Life Examples: Gas-discharge Nixie tube display grid drivers, vintage television CRT cathode-drive matrix panels, high-voltage industrial test benches, and offline power supply regulators Show more