![]() Due to this biasing current, 2N3904 goes to the saturation state and the LED turns ON. They can operate at a wide supply voltage ranging from 3.6V to 12V DC. The working of both circuits is simple, they are using only a few components. When looking at the flat side with the leads pointed downward, the three leads. For a detailed description of pinout, dimension features, and specifications download the datasheet of 2N3904. When the switch is closed, the base of the transistor is biased, and current flows to the base of the transistor. The 2N3904 is manufactured in a plastic TO-92 case. Both the 2N3904 and 2N2222 are identical in terms of handling collector-to-emitter voltages, and both can handle voltages of up to 40V. Due to this, 2N3904 remains in the cut-off state and the LED does not glow. The 2N3904 is an extremely popular NPN transistor that is used as a simple electronic switch or amplifier that can handle 200 mA (absolute maximum) and frequencies as high as 100 MHz when used as an amplifier. And no current flows to the base of the transistor. When the switch is open, the base of the transistor is not biased. The required resistor value can be easily calculated using Ohm’s law. NPN General Purpose Amplifier, 2N3904 Datasheet, 2N3904 circuit, 2N3904 data sheet : FAIRCHILD, alldatasheet, Datasheet, Datasheet search site for Electronic Components and Semiconductors, integrated circuits, diodes, triacs and other semiconductors. ![]() Proper biasing of the base ensures adequate base current to turn ON the transistor.Ī resistor of 220 Ohm is connected between the load(LED) and the collector terminal to protect the LED from overcurrent. The base of the transistor is biased using a 10 K Ohm resistor(R3) in parallel to the 1 K Ohm resistor(R2) plus base-emitter junction resistance(in series). 2N3904 NPN transistor hence the collector and emitter will be left open (Reverse biased) when the base pin is held at. The complete circuit is powered via a 5 V supply. In the circuit diagram given above, 2N3904 is used as a switch to turn ON/OFF an LED connected at the collector terminal.
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