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Pin1 Cathode |
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ArtGon007 
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Joined: 26 Jul 2022 Status: Offline Points: 2 |
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 Topic: Pin1 CathodePosted: 26 Jul 2022 at 10:31am |
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Is there a specification that specifies pin 1 is cathode for diodes? Or is it just industry standard?Diode issues strike again...
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Tom H
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Joined: 05 Jan 2012 Location: San Diego, CA Status: Offline Points: 5718 |
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Posted: 26 Jul 2022 at 12:49pm |
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Pin 1 for Cathode was started back in the 1990's with OrCAD Layout (which was taken offline in 2007 after Cadence bought it).
I created the CADPRO library and sold a copy to OrCAD as their default library before Cadence acquisitioned them. All the diodes had pin 1 as the Cathode so OrCAD Capture symbols put pin 1 on the Cathode. It is a DeFacto standard because OrCAD Capture was the number one most used schematic tool for many years. We now use C and A for the pin assignments to avoid mistakes and confusion. |
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