The ADuC7028 and ADuC7029 come in 64-Ball and 49-Ball BGA packages respectively.
When mounting these devices on a PCB, is underfill required?
Frstly, underfill is not a requirement.
If you wish to use it, we have no issues with this. HOWEVER, it is solely a customer decision and responsibility to ensure that they pick the correct material for their application (as an incorrect material can cause more damage then not having it).
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