![]() 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. Working Principle of 2N2222A Transistor.The transistor 2N2907 is complementary pair for 2N2222 and has identical specs as above, however being a PNP type the associated polarities are exactly opposite.The value of the current limiting resistor may be calculated by using the formula explained at the end of this article.The base goes to the source voltage or the triggering voltage via a current limiting resistor.The load which needs to be switched must be connected in between the collector of the transistor and the positive supply, that is, the positive lead of the load goes to the positive supply while the other lead of the load gets connected to the collector lead of the transistor. The pin out or the leg that’s marked emitter must be connected to the negative line of the supply rail. This may be done by following the below explained steps: Configuring the device practically in electronic circuits for any relevant application: For a 2N2222A, the figures are 1.2 and 2 volts respectively. With collector current exceeding 500 mA, the base optimal trigger voltage becomes 2.6 volts. The base-emitter saturation voltage for 2N2222 is typically 1.3 volts 15 mA, when the collector current is around 150 mA.Maximum frequency handling capacity or the transition frequency is 250 MHz for 2N2222 and 300 MHz for 2N2222A.hFE or the dC current gain of 2N2222 transistors will be around 7 5 minimum, at voltages near 10, with 10 mA collector current.Total power dissipation of the device should not exceed above 500 mW.As expressed earlier, the maximum current that can be applied across the transistors collector and emitter, via a load is not more than 800 mA.With their base open, the above tolerance across their collector and emitter leads is 30 volts for 2N2222 and 40 volts for 2N2222A.The device’s maximum voltage tolerance (breakdown voltage) across its collector and base is 60 volts for 2N2222 and 75 volts for 2N2222A, with the emitters kept open.The transistor 2N2222 or 2N2222A are NPN types and has the following electrical parameters: ![]()
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