david asked...........
IPC-SM-782 Figure 3-8 specifies that the minimum land to land spacing
between two different SMD IC type components is 0.050"(1.25mm).  Section
3.6.1.4 seems to indicate that the spacing between any two component lands
could be as small as 0.020" (0.05mm).  I would like to use the smaller of
the two since my board is very crowded.  What do you believe the real
clearance is?

David E. Dalke
Masimo Corporation
Irvine, CA
............................

david,
you will get some excellant advice from a number of well meaning, experienced
engineers on this.  However, please go ask the poor engineer (in-house or
sub-contract) who builds your hardware.  His equipment may not be of the
latest vintage, or his management may not believe in the highest levels of PM
or pay the cost of the latest stencil tecnology.  As a result, you need to
know what your factory can do, not what my factory can do.  Now if you find
that your factory is limiting what you can design, and you find that others
can do better, please feel free to load your cannon with that info.

steve mikell
lead ind. eng.
sci systems
technology group
plant 13

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