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2N3391 Datasheet (PDF) 1.1. 2n3390 2n3391 2n3391a 2n3392 2n3393.pdf Size:296K _fairchild_semi. Discrete POWER & Signal Technologies 2N3390 2N3391 2N3391A 2N3392 2N3393 B TO-92 C E NPN General Purpose Amplifier This device is designed for use as general purpose amplifiers and switches requiring collector currents to 300 mA. General Purpose Transistors(NPN Silicon), 2N3904 datasheet, 2N3904 circuit, 2N3904 data sheet : ONSEMI, alldatasheet, datasheet, Datasheet search site for Electronic Components and Semiconductors, integrated circuits, diodes, triacs, and other semiconductors. 2N3409 Transistor Datasheet pdf, 2N3409 Equivalent. Parameters and Characteristics Since the 2N3904 is an NPN transistor, that means the base needs positive biasing (appropriate voltage levels and resistance) to turn on the collector emitter junction for proper current flow. Use of a load resistor (R1 above) is also important so there is not too much current being driven through the LED and transistor.