The developer of the 2N222222 in the TO-18 package is considered to be the American company Motorola.

The most famous equivalents of 2N2222 are: Externally they are very similar to each other and are quite often found together in differential amplification stages schemes. We can say that the latter has “mirror” characteristics with respect to the one in question and differs only in PNP structure. The complementary pair is considered to be 2N2907(TO-18). Usually their HFE is found out beforehand, often with a multimeter and just before use in a project. Even devices of the same manufacturer may have different HFE values. The current gain (HFE) of the triode in question, like most similar electronic components from the 60’s, varies greatly and ranges from 100 to 300. In a separate column the measuring conditions are shown. Their values as for the maximum are given for temperature (TA) not more than +25 oC.

The electrical characteristics of 2N2222 are summarized in a single table below. According to the datasheet, some of them have an operating crystal temperature (TJ) of up to +200 oC. New devices are manufactured using lead-free technology (Lead Free) and comply with the European RoHS standard.

Storage Temperature T stg – 65 to 200 ☌ Įxceeding the maximum parameters during operation is not allowed and can lead to failure of the device.

Total Power Dissipation Ptot at T amb £ 25 ☌ 0.5 W.

Emitter-base Voltage VEBO (I C = 0) 5 V.

Collector-emitter VCEO Voltage (I B = 0) 30 V.

Collector-base Voltage VCBO (I E = 0) 60 V.

The maximum technical specifications of 2N2222 (at TA < +25oC): The datasheet states that the device is designed to operate at high switching speeds and provide effective amplification over a wide frequency range. They are true at ambient temperature (TA) of no more than +25oC. Let’s take a closer look at the 2N2222 transistor, its specifications and features. You should note that the “K” pin is physically connected to the metal case. The pin assignment is as follows (clockwise from the small protrusion): The pinout of the 2N2222 in the TO-18 is shown in the figure below.

2n2222 pinout download free