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BGA Rework - To Paste or Not to Paste (just Flux)

Dreamsniper

#28469

BGA Rework - To Paste or Not to Paste (just Flux) | 7 May, 2004

From my understanding paste on BGA pads are applied only to help in holding the component as the PCB is conveyed during the manufacturing process then soldered. But during rework on BGA's do I have to apply Solder Paste or just Flux? What's the difference in solder joint integrity and reliability with those 2 types of soldering BGA during rework?

So, Solder Paste or Flux Only...which is which?

Give your Best Shot!

Thanks.

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#28475

BGA Rework - To Paste or Not to Paste (just Flux) | 7 May, 2004

Either method is acceptable: * No IPC approved method * Applying flux only is easier than applying paste * Paste gives a higher stand-off, which should improve reliability

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Ken

#28480

BGA Rework - To Paste or Not to Paste (just Flux) | 7 May, 2004

...um also, don't forget that ther are planarity issues associated with BGA devices AND bow-and-twist issues with PCB materials.

An example I have one BGA device that has a ball planarity of 7 mils!!! Ant that's the OEM specification!

THis will result in opens and reliability issues if a flux only process is used.

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