Nicolas, it's so difficult to say without seeing the specific P/N. But,
your range is huge. Is this SMT only? Mixed tech?

IXNEY ON THE SMOKE AND MIRRORS, eh?  This is not brain surgery.  After
all this time, why isn't there a standard pattern or series of patterns
that can be used to calibrate the process? Maybe in the form of coupon?

Once the process is verified "in control" it is easy to extrapolate and
project adjacent thickness on varying pad geometries.

To get you in the ballpark, a 25mil pitch QFP should be able to maintain
a range of; 300 micro in. plus or minus 200 micro in.  So...thats half a
mil at the top of the range and 100 micro in. at the bottom.

if you need more specific info, contact me directly.

ps: I hope someone out there sees the value in standardizing this
important process. It's gonna be around for awhile.

mark

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