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Pin1 Cathode

Printed From: PCB Libraries Forum
Category: General
Forum Name: General Discussion
Forum Description: general topics not related to other forums
URL: https://www.PCBLibraries.com/forum/forum_posts.asp?TID=3148
Printed Date: 22 Nov 2024 at 12:07am


Topic: Pin1 Cathode
Posted By: ArtGon007
Subject: Pin1 Cathode
Date Posted: 26 Jul 2022 at 10:31am
Is there a specification that specifies pin 1 is cathode for diodes? Or is it just industry standard?Diode issues strike again...


Replies:
Posted By: Tom H
Date Posted: 26 Jul 2022 at 12:49pm
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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