TRANSISTOR MUSEUM  

Historic Transistor Photo Gallery   

 

 

Transistor Size (3/8” X 7/16”)

Date Code 7-12 (1957 Week 12)

 

 

Foldover Cardboard Packaging

 

RAYTHEON CK793

 

TYPE

Silicon PNP Alloy Junction

Low Frequency Amplifier/Switching in High Temperature Environments

 

USAGE

Military 

 

DATE INTRODUCED

1957

 

CASE STYLES

Red Metal

 

AVAILABILITY

Rare (Limited Production)

 

HISTORIC NOTES

 

The Raytheon CK793 (and the lower performing CK790 and CK791) were the first commercial silicon transistors developed by Raytheon.  In 1957, silicon technology was still “in development” and Raytheon introduced this series of transistors to address the military requirements of a high temperature environment (silicon performs much better than germanium at elevated temperatures).  Raytheon chose the alloy junction process for its first silicon transistors, which resulted in a very low yield.  These transistors were expensive when first released, with the 1957 Federated catalog listing the CK793 for $92 dollars.   In 1958, the CK793 was released by Raytheon as the 2N329.

 

 

 

 

 

 

 

 

Copyright © 2002 by Jack Ward

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