Linda,

Our data shows that using conformal coating as underfill can improve low
and high cycle fatigue life of BGA solder joints.

Years ago we conducted a test to compare the reliability of non-underfilled
BGAs, BGAs underfilled with a conformal coating material and BGAs
underfilled with reworkable epoxy. In general, BGAs underfilled with
conformal coating lasted longer than non-underfilled parts but failed
sooner than epoxy underfilled BGAs.

It depends on what type of BGAs are being underfilled and what conformal
coating material is being used as well as the test conditions.

I cannot share more without legal papers. If you wish to know more, contact
me offline.

Tom

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