[PCB_FORUM] Re: cathode pin 1 or 2

 
What more can be said after that :)
 
-- 
George Patrick
Tektronix, Inc.
Central Engineering, PCB Design Group
P.O. Box 500, M/S 39-512
Beaverton, OR 97077-0001
Phone: 503-627-5272         Fax: 503-627-5587 <http://www.tektronix.com/> 
http://www.tektronix.com     <http://www.pcb-designer.com/>
http://www.pcb-designer.com

It's my opinion, not Tektronix' 

-----Original Message-----
From: Clyde Sprowl [mailto:pwb_engineer@xxxxxxxxx] 
Sent: Wednesday, October 27, 2004 11:45
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [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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