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footprints recommendation

Former Member

If in a datasheet there is a recommended hole pattern, then should I use the exact same size as mentioned in 'recommended footprints' or its a good practice to create footprints with 15-20mil greater than recommendation. I am a new eagle user.

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  • jimmy board wrote on Mon, 25 July 2016 02:58

    If in a datasheet there is a recommended hole pattern, then should I

    use the exact same size as mentioned in 'recommended footprints' or its a

    good practice to create footprints with 15-20mil greater than

    recommendation. I am a new eagle user.

    ]

     

     

    The thing to remember is that you have CAD on one hand and the

    manufacturing process on the other.

    They are not one and the same.

     

    Many manufacturers consider your drill size to a finished/plated size and

    hence use a larger drill and the plating takes you down to a smaller hole

    size.

     

    So you need to know what your manufacturer is using and what their standard

    drill/hole sizes are.

     

    When you read the data sheet, generally they are saying, "I want this size

    copper here and a hole this big for the lead." so they are finished sizes.

    Do a bunch of cross checks as datasheets can have errors. Compare the lead

    dimensions with the hole size. Consider if your specific manufacturer will

    produce a finished size when you specify the hole size in your drill file

    or do they take you drill file sizes and plate the hole smaller. If they do

    you will need to compensate for this.

     

    HTH

    Warren

     

     

     

    --

    Web access to CadSoft support forums at www.eaglecentral.ca.  Where the CadSoft EAGLE community meets.

     

Reply

  • jimmy board wrote on Mon, 25 July 2016 02:58

    If in a datasheet there is a recommended hole pattern, then should I

    use the exact same size as mentioned in 'recommended footprints' or its a

    good practice to create footprints with 15-20mil greater than

    recommendation. I am a new eagle user.

    ]

     

     

    The thing to remember is that you have CAD on one hand and the

    manufacturing process on the other.

    They are not one and the same.

     

    Many manufacturers consider your drill size to a finished/plated size and

    hence use a larger drill and the plating takes you down to a smaller hole

    size.

     

    So you need to know what your manufacturer is using and what their standard

    drill/hole sizes are.

     

    When you read the data sheet, generally they are saying, "I want this size

    copper here and a hole this big for the lead." so they are finished sizes.

    Do a bunch of cross checks as datasheets can have errors. Compare the lead

    dimensions with the hole size. Consider if your specific manufacturer will

    produce a finished size when you specify the hole size in your drill file

    or do they take you drill file sizes and plate the hole smaller. If they do

    you will need to compensate for this.

     

    HTH

    Warren

     

     

     

    --

    Web access to CadSoft support forums at www.eaglecentral.ca.  Where the CadSoft EAGLE community meets.

     

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