Commercial transistors

The 2N3055 is a silicon NPN power transistor intended for general purpose applications. It was introduced in the early 1960s by RCA using a hometaxial power transistor process, transitioned to an epitaxial base in the mid-1970s. Its numbering follows the JEDEC standard. It is a transistor type of enduring popularity.

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.

thumb|BC548 transistor The BC548 is a general-purpose NPN bipolar junction transistor commonly used in European and American electronic equipment. It is notably often the first type of bipolar transistor hobbyists encounter and is often featured in designs in hobby electronics magazines where a general-purpose transistor is required. The BC548 is low in cost and widely available.

thumb|A 2N3904 made by Motorola. The pinout from left to right is: Emitter, Base, Collector. thumb|A 2N3904 (lower left) in a TO-92 package on a breadboard

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