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We started using local fiducials on 132 pin gate arrays with
mounting fingers on ,025 centerline spacing. We placed .100 dia solid
pads on a diagonal within the footprint outline. Our in-house assembly
people have now requested to incorporate local fiducials only on parts
with mounting fingers located on .020 centerline spacing or less.
Hope that helps.
Regards,
Bob Vanech Bob
Northrop Grumman
Norden Systems
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