Underfill 300balls BGA connector

> All, Does anyone have experience with underfill > 300balls BGA connector? We have a component with > 300balls BGA connector that connectorize with > Flex. Customer wants to have an > underfill > > Questions - Possibility for > underfill 300balls BGA connector - Application > of an underfill recommended for 300balls BGA > connector - Does one normally require an > underfill for this components > > Thank,

Hi,

that sounds very interesting

By connector, you mean socket? What is the material of the connector(socket)? Is it very frigale? how big are the balls(diameter)?

I know only FC or some CSP to need underfil. If you give more information, we could help with something.

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We have BGA connectors on rigid laminate. Points are: * We love BGA connectors for mating mother/daughter boards because they eliminate the wave solder step required for PTH connectors. * BGA connectors are very tricky to assemble, much trickier than BGA. So, environmental testing is absolutly necessary to validate process and assure reliable product. * We'd guess that underfilling a huge connector like this on flex is a bad idea, because it would create a large rigid surface with multiple CTE.

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