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regular pad flash and odb++ output

Les Wong

We flash a 5 mil pad on the top and bottom layers for a non-plated hole.

A larger pad is there in Allegro 17.2 to keep copper away from the hole.

When we gerber out, the large pad is replaced with the 5 mil pad that gets drilled away.

We cannot get ODB++ out inside Allegro to make this substitution.

Is anyone doing some thing similar ?

Thanks

Les

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  • CadAce2K

    Hi Les,

    This is the 'old' way of doing what you want. What I do is have the 5mil pad, but in the padstack set the 'Keep Out' to be the size you want the copper to be pulled back. You don't need to set a 'large' pad for keepaway any longer.  FYI - I don't set any "thermal pad" or "anti pad" definitions either since I don't use negative planes.

  • Les Wong
    in reply to CadAce2K

    Thank you.

    I guess we need to update are NPTH padstacks ....

    Les

  • eDave
    in reply to Les Wong

    Why not use the hole-to spacing constraint?

  • Les Wong
    in reply to eDave

    Dave

    I guess in the case of a NPTH we can since Allegro does not DRC to the actual Drill tool size yet ?

  • CadAce2K
    in reply to Les Wong

    Hi. The reason I do it in the padstack (in the central library) is because it's 'global'. If you set it in the hole-to-spacing constraint, that's 'local' to each database. Too many chances for it to get overlooked if you're working with numerous designers. I go so far as to double-check stuff like mounting holes and make sure they're accounted for. Mechanical goodies can come back to haunt you. Good day.

  • Les Wong
    in reply to CadAce2K

    We will set a keepout value in the padstack for min hole to copper for NPTH.

    We will use drill to copper spacing rule for nets that require larger spacing.

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  • Les Wong
    in reply to CadAce2K

    We will set a keepout value in the padstack for min hole to copper for NPTH.

    We will use drill to copper spacing rule for nets that require larger spacing.

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