Flux or Solder Paste?

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We are going to start doing rework of Lead Free BGA's. Have... - Oct 29, 2006 by

We've always used flux in reworking BGA, except with some do... - Oct 31, 2006 by davef

I'm reworking lead free BGAs now, on a Conceptronics Freedom... - Nov 01, 2006 by BillyD

Flux is fine, make sure you have one that will withstand the... - Nov 01, 2006 by RDR

LMPH

#44757

Flux or Solder Paste? | 29 October, 2006

We are going to start doing rework of Lead Free BGA's. Have always used flux for SN/Pb boards/BGA's with good results. Can flux be used fro lead free as well? Boards were originally assembled using lead free paste and components. Hence, the BGA we will need to rework has lead free balls. A co-worker suggests we use solder paste because of the higher melting point of BGA balls. Please advise.

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davef

#44809

Flux or Solder Paste? | 31 October, 2006

We've always used flux in reworking BGA, except with some dodgy designs, when we use paste.

We see no reason to switch to paste. We do not understand your coworker's concerns, nor do we understand the impact of using paste because of the higher melting point of BGA balls.

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BillyD

#44820

Flux or Solder Paste? | 1 November, 2006

I'm reworking lead free BGAs now, on a Conceptronics Freedom 3000. I use flux only (no-clean, Indium) all the time, with no issues. If you go to paste, you also understand that you still have to hit the same temperatures as with flux, as the solder is only in a different form than the BGA balls themselves.

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RDR

#44834

Flux or Solder Paste? | 1 November, 2006

Flux is fine, make sure you have one that will withstand the extended and hotter reflow for the Lead free, your paste MFGR will most likely have the flux formula in their paste available as a tacky or paste flux

Russ

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