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There is a rectangle around the outside of my OrCAD footprint (pointed to with the blue arrow), and it is on the no-probe-top layer. I googled it but I couldn't find any explanation of what that layer is. enter image description here

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Very dependent on the process, but likely that is a virtual layer that is used by the foundry to indicate to them that any top-side pads covered by said layer is not meant to be probed during any testing.

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  • \$\begingroup\$ What would be the purpose of that? \$\endgroup\$ – bob bob Oct 9 '20 at 20:09
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    \$\begingroup\$ One reason I could think of is that probe marks on a pad can cause a failure for an automatic optical inspection tool (false yield failures), or perhaps make it difficult to bond a wire to the pad. \$\endgroup\$ – Shamtam Oct 9 '20 at 20:45

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