Hello TechNet:

I have some questions regarding 0402 technology.

1.  Has anyone optimized 0402 pad geometry?
2.  Has anyone optimized 0402 stencil aperture openings?
3.  What tombstoning issues, and other defects, have you experienced and
what preventative measures have you incorporated into the process to
eliminate tombstoning?
4.  What were predominant equipment issues related to the implementation of
0402 technology:
        A.  Preventative maintainance schedule changes???
        B.  Calibration issues???
        C.  Operator training???
        D.  Feeder issues/identification???
5.  What are your inspection methods???
        A.  Manual
        B.  Automatic

Since we are all, for the most part being driven to smaller, lighter,
cheaper, faster, with more power we will soon encounter this technology and
other technologies as densities increase.  Would appreciate any and all
help.  With the brain trust on this forum it is the best place to start.

If you have experience in any or all of these areas answer on the TechNet so
everyone can benefit.  We have done some very minor work, mainly under
scopes, with 0402 technology.  We had small, small, run product and did hand
assembly about four years ago.

Thanks To All In Advance

Ron Hollandsworth
Operations Task Leader
ITT

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