[PCB_FORUM] Re: cathode pin 1 or 2

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
  ----------------------------------------------------------- To subscribe/unsubscribe: Send a message to icu-pcb-forum-request@xxxxxxxxxxxxx with a subject of subscribe or unsubscribe To view the archives of this list please login at http://www.freelists.org. Our list name is icu-pcb-forum or go to http://www.freelists.org/archives/icu-pcb-forum/ Problems or Questions: Send an email to icu-pcb-forum-admins@xxxxxxxxxxxxx Want to post a job listing ? DON'T DO IT HERE! Better yet, join our jobs listing forum. SUBSCRIBE: icu-jobs-forum-subscribe@xxxxxxxxxx POST: icu-jobs-forum@xxxxxxxxxx -----------------------------------------------------------

Other related posts: