[PCB_FORUM] Re: cathode pin 1 or 2

STOP IT RIGHT NOW! THIS STUPID THREAD HAS RUN ON 3 DIFFERENT LISTSERVERS! 
CATHODE IS ALWAYS PIN 1 AND THAT'S THAT. 

David Smyser <dsmyser@xxxxxxxxxx> wrote:westfeldt wrote: 
Just noticed that the PADS users group overwhelmingly uses pin 1 for cathode.  
What's the vote on this list? 
Patrick Westfeldt, Jr. 
North Boulder Circuit Design 
westfeldt_nbcd@xxxxxxxxx 
720-406-0887 
c 720-272-5822
   Pat, 
         Glad you've brought up the subject. Here's my 2 cents. From the 
   flood of responses from yesterday, I thought these three had merit. 
   1. From Alan Ritter 
      Basically, our nomenclature is that pin 1 is the "identified" end of a 
      polarized component.  Since the band on traditional diodes is the cathode 
      end, that becomes pin 1. 
   2. From Donna Robertson 
      If you are  following  IPC-7351   Pin 1 is the Cathode. 
   3. From Rick Joike 
      According to the IEEE standards 1992 edition, D or CR may be used, and 
the 
      pins are identified as "A" & "K". 
   ======================================================== 
   I had also heard that JEDEC defines pin 1 as the Cathode. But that it's due 
   to defining pin 1 as the first pin off of the tape & reel. 
   The person that actually solders the part on the board or does the rework, 
   doesn't have a say-so in this kind of decision, but should. 
   Regards, David - dsmyser@xxxxxxxxxx 
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