The V CE is almost equal to zero when a sufficient voltage i.e., V IN > o.7 is applied between base and emitter. When a voltage difference is applied to the base, a current flow across the collector-emitter (I CE), and the switch is turned off when there is no base voltage. Transistors are most commonly used as a switch in the electronic world. The 2N2222A transistors have a large use in the world of switches and amplifiers – the two main uses of any transistor existing in the electronics arena.įirstly, we will talk about, 2N2222A Transistor as a Switch At Cut-off Region the V BE remains be around 660 mV. When the base current is removed the transistor gets fully off, and this stage is called as the Cut-off Region. This particular stage is called Saturation Region at this time the voltage allowed across the collector-emitter (V CE) and base-emitter (V BE) could be 200 and 900 mV respectively. After it gets fully biased then it can allow a maximum of the max value of current flows across the collector and emitter. The 2N2222A transistor offers a constant DC collector current of 800 mA, so, loads that consume more than 800 mA current cannot be connected using this transistor.įor biasing current is supplied to the base pin (I B) which should be under 5 mA. 2N2222A has a gain value of 110 to 800 which determines its amplification value. The collector and emitter are left open when the base pin is held at the ground and are closed when a signal is provided to the base pin. This pin allows the current to come out of the transistor.Īs mentioned earlier, in the 2N2222A transistor, the dopped layer is embedded between two n-dopped layers. This pin controls the biasing of the transistor. This pin allows the current to enter the transistor form here. 2N2222A Transistor Pin Configuration, Pin diagram, Pinout Pin No. The pin configuration/pin diagram and functionality of the 2N2222A Transistor are shown below. It consists of three terminals namely, collector, base, and emitter.
It is commonly used in very high-frequency amplifiers.ĢN2222A Transistor Pin Configuration/Pin diagram/Pinout Hence, we can say that it is ideal for applications that require low to medium current. Therefore, when the 2N2222A transistor is fully biased, then it allows a maximum of 800 mA current to flow across the collector emitter. It also offers a constant DC collector current like 800 mA.
It is accessible in the package of To-92. It is a current controlled transistor, specially outlined to have fairly high speed even in low power, low to medium current, and medium voltage. Since it’s an NPN transistor so the collector and emitter are reverse biased and the base is forward biased. It is a common NPN Bipolar Junction Transistor i.e., one P-doped layer stands between the two N-doped layers.
Like every other amplifier, even a 2N2222A transistor is also used for amplification and switching.
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