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Reliability assessment SnPb joints to lead-free component

Joseph

#34806

Reliability assessment SnPb joints to lead-free component | 7 June, 2005

Dear all,

Recently we encountered some functionality failure when using lead-free component(Sn99.3/Cu0.7)at SnPb(Sn63Pb37) wave soldering process.

Can lead-free component use at non-lead free process? Any input/idea are much appreciated.

Rgds

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#34819

Reliability assessment SnPb joints to lead-free component | 8 June, 2005

Could you describe the problem you encounter

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Joseph

#34834

Reliability assessment SnPb joints to lead-free component | 9 June, 2005

Dear Patrick,

Unfortunately we do not know what exactly the failure as our customer refuse to reveal to us. From visual inspection the solder joints are smooth and shiny as per IPC-A-610 requirements. The component supplier (IR) commended that they cannot guarantee satisfactory results when using lead-free parts on a leaded production process.

The component is TO220 (through-hole type) with manufacturer part no. IRG4BC40FPbF which alloy is 99.3Sn/0.7Cu or 98.4Sn/0.5Ag/1.0Cu.

Kindly give us your comments if any.

Best regards,

Joseph

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Clampron

#34835

Reliability assessment SnPb joints to lead-free component | 9 June, 2005

Joseph,

We have all been using lead free components for some time. Many passive already have a Pb free plating and we have not seen catastophic failures on them. From the information I have seen, I think this should be OK (with the exception of BGA's) We are now processing some Pb free connectors as well with no apparent problems. I think that the plating should not be the cause of the failure as long as the solder joints meet IPC requirements.

Good Luck

Chris

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#34853

Reliability assessment SnPb joints to lead-free component | 9 June, 2005

Hi Joseph,

It's difficult to troubleshoot if the defect is unknown, but I agree with Chris The majority of components are already lead-free and only 17% of the worldwide electronics industry switched to lead-free wave and/or paste so the majority of companies are soldering with leaded solder and if there would be issues they would already have been reported. If i understand correct your components supplier is saying he can garanty good results when using lead-free solder, you should ask him which standard he is referring too.

Patrick

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