Here's a Friday afternoon puzzler.  We're participating in a project with
another firm who is responsible for designing the circuit and PCB.  They
just discovered their controller chip wasn't as effective as early testing
showed, so they've switched to another.  What they want to do is use a
daughter board to allow the alternate part to be placed on the footprint of
the first part.  The footprint of the original part uses an .035 wide pad on
a .050 pitch, near as I can measure.  It has 15 pads per side on two
opposing sides.   The concept of the daughter board was to selectively plate
two of it's edges to simulate a J leaded device.  I've successfully plated
the entire edge of some boards for years now, but know of no way to
selectively plate "leads" about .030 wide along an edge of an .062 thick
board.  One house in the Pacific northwest was able to actually do it for
some protos, but with a very low yield and refused to take the production
order.  My local house that's been doing the entire edge for years and
another high end house looked at the design and laughed.  My recommendation
to Sr. Management is to respin the mother board and take the hit.

Does anyone know of a house anywhere that could plate (and trim) a plated
edge to simulate a lead and is crazy enough to accept an order for 350
pieces total?

Bob Croslin
Nielsen Media Research

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