Printed Circuit Board Assembly & PCB Design SMT Electronics Assembly Manufacturing Forum

Printed Circuit Board Assembly & PCB Design Forum

SMT electronics assembly manufacturing forum.


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Thomas

#44249

Double side BGA mounting. | 2 October, 2006

Hello,

Have anyone of you any experience of mounting BGA-s on both side of the PCB in lead free process? Have you seen any problems after the second reflow? Is it something special to focus on?

/Thomas

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Brian

#44283

Double side BGA mounting. | 3 October, 2006

You might need to use a pallet that provides some shielding for the BGA that is hanging on the bottom of the board.

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Moby

#44288

Double side BGA mounting. | 3 October, 2006

This is an issue that we are seeing a lot! It used to be that the primary-side (component-side...top-side) had most of the active components. It was simple: reflow bottom first. Now, we are seeing both sides of the assembly having the same amount of BGA's and/or fine-pitch. Besides using pallets (which distort the profile) How can we keep the BGA's from lifting? Please don't suggest adhesive... HELP!!

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#44294

Double side BGA mounting. | 3 October, 2006

No adhesive? Then how about 2 different solder pastes? Higher melting temp for the first side, lower for the second.

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