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Square vs. round pads for +/- polarized parts

Discussion in 'CAD' started by Chris Carlen, Oct 5, 2006.

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  1. Chris Carlen

    Chris Carlen Guest

    Greetings:


    Is there a standard on which pad to make square vs. round for +/- on
    polarized caps, or for anodes/cathodes on diodes?

    I am inclined to prefer square pads for + terminals and anodes, because
    a square is more visually similar to a plus sign.

    Obviously it doesn't matter much. But it seems other folks' diodes
    often have the anodes round and cathodes square.

    Thanks for input.



    --
    Good day!

    ________________________________________
    Christopher R. Carlen
    Principal Laser&Electronics Technologist
    Sandia National Laboratories CA USA

    NOTE, delete texts: "RemoveThis" and
    "BOGUS" from email address to reply.
     
  2. Chuck Harris

    Chuck Harris Guest

    I use square pads for pin 1 on chips, resistors, and capacitors, for + on
    polarized capacitors, and for cathodes on diodes.

    -Chuck Harris
     
  3. I use square pads for "identified" pins. Pin 1 on ICs. Cathode (stripe) on
    diodes. And, since most electrolytic capacitors have the (-) lead
    identified, the (-) lead on electrolytics. I don't use tantalums, which
    have the (+) lead identified usually.

    Jim
     
  4. Chuck Harris

    Chuck Harris Guest

    I use the square pads to make my life easier when I assemble the boards. Electrolytics
    have a long lead on +, or a rolled edge on + so I make that the square pad... besides,
    I am more "schematic-centric" in the way I see electronics. For electrolytics, the plus
    lead is what is identified on the schematic, not the minus.

    -Chuck
     
  5. Chris Carlen

    Chris Carlen Guest

    That sorta makes sense, but as Chuck points out in his next post, some
    parts are identified by both a long lead and a printed marking on the
    body. These sometimes conflict, as with electrolytics.



    But I'm beginning to think that a square pad for diode cathodes is most
    logical.




    --
    Good day!

    ________________________________________
    Christopher R. Carlen
    Principal Laser&Electronics Technologist
    Sandia National Laboratories CA USA

    NOTE, delete texts: "RemoveThis" and
    "BOGUS" from email address to reply.
     
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