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Thermal relief clearance

bulldog

I was wondering if anybody knows what the IPC recommended clearance is for a thermal relief around pads.  Thanks!

  • steve

    I don't believe there is an IPC standard. Yo could try having a look at PCB matrix. There is a free IPC Calculator which may give clearances for theremal reliefs. I would always use the manufacturers minmum line-pad spacing as a starting point.....

  • bulldog

    Thanks Steve, I'll look into it.

    From what I have been able to find it looks like most vendors prefer a minimum of .010" with a desire for .012".

     

  • hcowles

    at the pcbmatrix website http://www.pcbmatrix.com/Downloads/GeneralDocuments.asp

    the padstacks document contains the IPC-7251 Padstack Charts (locked).xls that has the recommended padstack parameters for all 3 levels (most, nominal, least) of padstacks

    created by PCB Matrix using IPC-2221 IPC-7251 PTH Padstack table for levels A, B, C

     

  • Nagaraj Shanmu
    Have a look at this , gives information on thermal relief calculation.
     
    http://www.pcbmatrix.com/forum/forum_posts.asp?TID=2200
     

    ~Nagaraj
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