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

Neil Johnson neil.johnson71 at gmail.com
Sat Jul 6 18:29:17 CEST 2013

Justin Owen wrote:
> 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.

Most LED packages indicate the cathode in some way.  The 3mm and 5mm 
standard packages use a flat to denote the cathode (I have the phrase 
"flat denotes cathode" permanently stuck in my mind).  So I follow suit 
with PCB foot prints and mark the cathode both with a square pad and on 
the silkscreen.

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