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'[EE] Lead solder on RoHS chips?'
2011\10\16@121035 by Electron

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Hi all,

can (for personal use) lead solder be used on RoHS chips without any concern?
Or the best soldering is achieved by using RoHS (lead free) solders?

Thanks,
Mario

2011\10\17@040012 by Peter

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Electron <electron2k4 <at> infinito.it> writes:
> can (for personal use) lead solder be used on RoHS chips without any concern?
> Or the best soldering is achieved by using RoHS (lead free) solders?

Yes, with new parts (never soldered), but not for bgas (mixing rohs and non rohs
balls).

The problems appear when even small amounts of rohs solder mix with different
type rohs solder and/or leaded. The problems consist in the solder turning into
murky clumpy metal paste which refuses to solder and may become impossible to
get off or handle in any way. The only fix I know is to melt a generous amount
of ultra low temperature solder into it and suck up the mess with solder pump
and wick until no trace of it is left.

-- Peter

2011\10\17@152543 by Electron

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At 09.56 2011.10.17, you wrote:
>Electron <electron2k4 <at> infinito.it> writes:
>> can (for personal use) lead solder be used on RoHS chips without any concern?
>> Or the best soldering is achieved by using RoHS (lead free) solders?
>
>Yes, with new parts (never soldered), but not for bgas (mixing rohs
>and non rohs
>balls).
>
>The problems appear when even small amounts of rohs solder mix with different
>type rohs solder and/or leaded. The problems consist in the solder turning into
>murky clumpy metal paste which refuses to solder and may become impossible to
>get off or handle in any way. The only fix I know is to melt a generous amount
>of ultra low temperature solder into it and suck up the mess with solder pump
>and wick until no trace of it is left.

Which may even damage the PCB if not done carefully. Been there, done that. :(

Thanks for the infos.


>
>-- Peter
>
>

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