Order today, ships today. 2N3904BU – Bipolar (BJT) Transistor NPN 40V 200mA 300MHz 625mW Through Hole TO-92-3 from ON Semiconductor. Pricing and Availability on millions of electronic components from Digi-Key Electronics. small signal pnp transistor preliminary data silicon epitaxial planar npn transistor to-92 package suitable for through-hole pcb assembly the npn complementary type is 2n3904 applications well suitable for tv and home appliance equipment small load switch transistor with 2N3904 / MMBT3904 / PZT3904 2N3904 MMBT3904 PZT3904 NPN General Purpose Amplifier This device is designed as a general purpose amplifier and switch. The useful dynamic range extends to 100 mA as a switch and to 100 MHz as an amplifier. Sourced from Process 23. Absolute Maximum Ratings* TA = 25°C unless otherwise noted LESHAN RADIO COMPANY, LTD.L2N3904L2N3904-1/6NPN SiliconGeneral Purpose TransistorsL2N3904TO-921 232N3904 datasheet search, datasheets, Datasheet search site for Electronic Components and Semiconductors, integrated circuits, diodes and other semiconductors. 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. The 2N3904 comes in a TO-92 case with leads in the order C,B,E. Some equivalent transistors have the opposite pinout (E,B,C) and some are B,C,E. This won't be a problem so long as you are aware of the difference, and refer to the datasheet of the part you are using when wiring up the circuit.