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 It was originally made in the TO-18 metal can as shown in the picture.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 NPNbipolar junction transistor (BJT) used for general purpose low-power amplifying or switching applications. Note that parts that start with 'P2N' have a different pinout than those that start with '2N' and 'PN' (see text).
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