The P2N2222 has a different order of pins than the metal case 2N2222, with its emitter and collector connections switched other plastic-case transistors also have different pinouts. Replacements for the 2N2222 are commonly available in the cheaper TO-92 packaging, where it is known as the PN2222 or P2N2222, which has similar specifications except for the lower maximum collector current. NPN silicon transistors with similar properties are also made in a variety of small through-hole and surface mount packages including TO-92, SOT-23, and SOT-223. Pinout of 2N2222 variants in plastic TO-92 package. It is used in a variety of analog amplification and switching applications. Therefore, it is important to refer to the datasheet for the exact part number and manufacturer.Īll variations have a beta or current gain (h fe) of at least 100 in optimal conditions. The exact specifications depend on the manufacturer, case type, and variation. Other part numbers will have different parameters. JEDEC registered parameters include outline dimensions, small-signal current gain, transition frequency, maximum values for voltage withstand, current rating, power dissipation and temperature rating, and others, measured under standard test conditions. The JEDEC registration of a device number ensures particular rated values will be met by all parts offered under that number. Since then it has been made by many semiconductor companies, for example, Texas Instruments. The 2N2222 was part of a family of devices described by Motorola at a 1962 IRE convention. It is frequently used as a small-signal transistor, and it remains a small general purpose transistor of enduring popularity. The 2N2222 is considered a very common transistor, and is used as an exemplar of an NPN transistor. It was originally made in the TO-18 metal can as shown in the picture. It is designed for low to medium current, low power, medium voltage, and can operate at moderately high speeds. The 2N2222 is a common NPN bipolar junction transistor (BJT) used for general purpose low-power amplifying or switching applications.

Cross section of 2N2222 in metal TO-18 package, showing connection wires between external pins and die.

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