Western Electric 2N66  
Written by Accutron on 2017-12-19  

Introduced in 1955, the 2N66 is Western Electric's first production power transistor. Derived directly from the Bell Labs M1777 power transistor prototype, the 2N66 is a general purpose germanium PNP alloy junction device, rated at 0.8W dissipation. The 2N66 established a package standard which would be used with a number of subsequent transistor types.

Western Electric 2N66 Datasheet (PDF)

Western Electric 2N66 alloy junction transistor, manufactured in 1955.

2N66 transistor, underside construction and original packaging.

This article is part of the [Discrete Semiconductors] exhibit.

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