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OrCAD PCB 16.6 - copper heat sink for a DFN with no electrical connections

embeddedTom

I need to attach a copper shape to the epad of a DFN for heat sinking purposes. Adding a static solid etch shape to the pad causes all kinds of DRC errors.

I'm new to 16.6 and it looks like I have several ways to do this:

- Ignore the DRC's.

- Make a region around the DFN and set up constraints that'll work.

- ???

I'm cleaning up a design that had this connected to ground, but it should be electrically isolated.

What's the best way to handle this?

Pic from data sheet attached.

Thanks.

Tom

Parents
  • Thanks Ulfk! Worked perfectly.

    But what is the best-practices way of getting rid of the DRC errors (shape too close to pin)? I don't want to narrow it down where the heat sink copper meets the epad. Should I waive the DRC's, or create a Region around the device and change the constraints?
Reply
  • Thanks Ulfk! Worked perfectly.

    But what is the best-practices way of getting rid of the DRC errors (shape too close to pin)? I don't want to narrow it down where the heat sink copper meets the epad. Should I waive the DRC's, or create a Region around the device and change the constraints?
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