I'm having a disagreement with another engineer on the convention for numbering the anode and cathode of a diode. We both use ORCAD for schematic designs. I always use diode parts with pins numbered 1 for cathode and 2 for anode. His designs only name the terminal, with no numbering. We were collaborating on a design and somehow the PCB layout design shows the diodes reversed. We know the problem is that the pin numbers in the layout are reversed from my convention of 1 for cathode and 2 for anode. So we made changes to fix the problem, but now we are both wondering what the convention acutally is? I saw online a document IPC-7351 that recommends pin 1 as cathode, but this is the only document that I could find. Is this relevant? Does anyone else have this problem?
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