|
TRANSISTOR
MUSEUM™ Historic Transistor Photo
Gallery Photo Essay – Shockley 4
Layer Diodes |
|
|
Photo Courtesy Gene Weckler |
Type 4N120D Shockley Diode |
|
Photo
Essay Commentary These
photos illustrate two of the various case styles used for Shockley
diodes. The leftmost unit is a high
power device (4G200D), which is a 200 volt, 50 milliamp device that cost $40
in 1959. The unit on the right is a 4N120D, which is a lower power device
that sold for approximately $8. The
“4N” numbering series appears to have been used for the earliest devices,
with later devices labeled as “4E, F and G”.
The numbers following the type id were used to represent the switching
voltage of the device, so that the 4G200D was a 200 volt device, and the
4N120D switched at 120 volts. See [1]
for additional information regarding model numbers and performance. Go
To PhotoGallery Shockley Diodes Page 3 |
|
|
Copyright © 2005 by Jack Ward. All Rights Reserved. http://www.transistormuseum.com/ PAGE 2 |
|
