2N2222
Sign in to savethumb|right|2N2222A in metal TO-18 package with the emitter, base and collector identified as E, B, and C respectively. thumb|right|Cross section of 2N2222 in metal TO-18 package, showing connection wires between external pins and die.
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thumb|right|2N2222A in metal TO-18 package with the emitter, base and collector identified as E, B, and C respectively. thumb|right|Cross section of 2N2222 in metal TO-18 package, showing connection wires between external pins and die.
The 2N2222 is a common NPN bipolar junction transistor (BJT) used for general purpose low-power amplifying or switching applications. It is designed for low to medium current, low power, medium voltage, and can operate at moderately high speeds. It was originally made in the TO-18 metal can as shown in the picture.