[PCB_FORUM] Re: cathode pin 1 or 2

Would that be waffling or flip flopping?



george.h.patrick@xxxxxxxxxxxxxx wrote:

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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Dave Seymour, CID+
Catapult Communications Inc.
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