[PCB_FORUM] Re: cathode pin 1 or 2

I agree with Clyde. Except when I'm sane...



                                                                                
                            
                       Clyde Sprowl                                             
                            
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[PCB_FORUM] Re: cathode pin 1 or 2     
                                                                                
                            
                       10/28/2004 07:54 PM                                      
                            
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Heh! You're crazy!(Embedded image moved to file: pic04313.gif)

chris.ball@xxxxxxxxx wrote:

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




 Clyde Sprowl
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 Sent by: @VALSMTP Subject: [PCB_FORUM] Re: cathode pin 1 or
 2
 10/27/2004 02:44 PM
 Please respond to
 icu-pcb-forum







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

 David Smyser 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 yeste rday, 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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