Pin1 Cathode

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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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Tom H Members Profile Send Private Message Find Members Posts Add to Buddy List Admin Group Joined: 05 Jan 2012 Location: San Diego, CA Status: Offline Points: 5982	Post Options Post Reply Quote Tom H Report Post Thanks(0) Quote Reply Topic: Pin1 Cathode 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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ArtGon007 Members Profile Send Private Message Find Members Posts Add to Buddy List New User Joined: 26 Jul 2022 Status: Offline Points: 2	Post Options Post Reply Quote ArtGon007 Report Post Thanks(0) Quote Reply 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...