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clearance between SMD parts?

autodeskguest

How much clearance do I need between SMD parts such a 0603 and 0403

parts.  I've heard in passing, that if pads for one SMD part are too

close to the pads for an adjacent SMD part, that the pick-n-place

matching might place them too close, resulting in the parts being

shorted.  Are there rules of thumb on this, or something on-line that

address this issue?

 

-Dave Pollum

 

  • On Fri, 28 Aug 2009 17:54:30 -0400, Dave Pollum <vze24h5m@verizon.net>

    wrote:

     

    How much clearance do I need between SMD parts such a 0603 and 0403

    parts.  I've heard in passing, that if pads for one SMD part are too

    close to the pads for an adjacent SMD part, that the pick-n-place

    matching might place them too close, resulting in the parts being

    shorted.  Are there rules of thumb on this, or something on-line that

    address this issue?

     

    -Dave Pollum

    Sorry, that should have been "pick-and-place machine".

    -Dave Pollum

     

     

  • Dave Pollum wrote:

    On Fri, 28 Aug 2009 17:54:30 -0400, Dave Pollum <vze24h5m@verizon.net>

    wrote:

     

    How much clearance do I need between SMD parts such a 0603 and 0403

    parts.  I've heard in passing, that if pads for one SMD part are too

    close to the pads for an adjacent SMD part, that the pick-n-place

    matching might place them too close, resulting in the parts being

    shorted.  Are there rules of thumb on this, or something on-line that

    address this issue?

     

    -Dave Pollum

    Sorry, that should have been "pick-and-place machine".

    -Dave Pollum

     

    As with all questions related to PCB production it is best to ask the

    assembly house(s). The local one I was going to use required 0 clearance

    between parts because the they used vacuum pickup on parts and the head

    was smaller then the part. So how much error does the pick and place

    machine have and how much part size variations would you have.

     

    The pad shape and clearances are somewhat affected by the soldering

    method and in most if not all cases will be bigger then the package so

    the pad to pad clearance should be all you need to worry about. If you

    need to do hand solder or rework/repairs larger pads and adding more

    clearance between part helps when removing one part.

     

    Paul R.