[sdiy] PCB square pads for LEDs - Cathode or Anode?

Colin f colin at colinfraser.com
Sat Jul 6 16:17:47 CEST 2013

> I've always used a square pad to indicate the cathode of an 
> LED on a PCB...
> is there a 'standard' - is that the right way round or the 
> wrong way round.

There are two standards I've seen used - the square for anode, or the square
for cathode.
There may be a third I've not seen.
Personally I prefer to use the square for anodes, but I put an 'A' next to
the anode and/or a diode symbol on the silkscreens for the avoidance of

Colin f

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