Stats

  • Locked Locked
  • Replies 2
  • Subscribers 166
  • Views 15316
  • Members are here 0
More Content
This discussion has been locked.
You can no longer post new replies to this discussion. If you have a question you can start a new discussion

unplated holes

shangwu

As a common practice in OrCAD PCB Editor, I create the unplated hole by putting a small pad that is smaller than the drill size, so it will be drilled away.  The problem is, the DFM checking software from PCB companies always complains about that and cause a lot of time wasted in communication.  Is there a way to create an unplated hole without any pad on it?

Thanks.

  • redwire

    Yes.  Mechanical pin.  Choose unplated hole in the padstack.  Most fabricators like a "target" pad (say 4 mils, for a 20+ mil drill).  Maybe some of the discount houses can only deal with a drill with no target pad?  Both methods work...

  • SevenFortyOneB

    Fabricators will usually use their CAM software to remove the "target" pads as one of the first things they do when prepping a job.  I'm not sure why they would complain about it as the removal is automatic and takes a few seconds to do.  If you want to create padstacks with target pads, consider adding a print note allowing/instructing the fabricator to remove pads that are smaller than and NPT holes.

    You can create a NPT pad stack with no "target" pads.  Leave begin, default internal, and end layer regular pads and thermal relief set to null and just define anti pads and solder mask clearances for the pad stack.  You can then place it as a mechanical pin in a symbol.

     

Cadence Guidelines

Community Guidelines

The Cadence Design Communities support Cadence users and technologists interacting to exchange ideas, news, technical information, and best practices to solve problems and get the most from Cadence technology. The community is open to everyone, and to provide the most value, we require participants to follow our Community Guidelines that facilitate a quality exchange of ideas and information. By accessing, contributing, using or downloading any materials from the site, you agree to be bound by the full Community Guidelines.