Good Day Everyone,

We have been running some experiments with different pad sizes / shapes for
reflow of 0402 type components. There are definitely differences in the
amount of tombstoning seen, but in all cases we experienced an unacceptable
level of defect. We run a BTU VIP98N oven with nitrogen inert and a fairly
standard ramp / soak / spike type profile. The paste is an eutectic no clean
that has been on the market for several years. Has anyone any suggestions in
reducing the number of tombstones on 0402's? We have run 0603 successfully
for quite awhile. Feel free to answer me directly (by email or phone) or via
the TechNet if you deem it of general interest.

Thanks,
             Robert Furrow
             SMT Process Engineer
             978-960-3224
             [log in to unmask]

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