[PCB_FORUM] Re: cathode pin 1 or 2

I agree with Clyde. Except when anode is pin 1....



                                                                                
                      
                       Clyde Sprowl                                             
                      
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[PCB_FORUM] Re: cathode pin 1 or 
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                       10/27/2004 02:44 PM                                      
                      
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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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