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Bipolar Junction NPN Transistor is designed for low to medium current, low power, medium voltage, and can operate at moderately high speeds. 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.2N2222A Bipolar Junction NPN Transistor is commonly used in general-purpose low-power amplifying/switching applications.

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: