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Tin Lead Silver BGAs

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#75590

Tin Lead Silver BGAs | 26 April, 2016

Hello SMTnet team, I have read before that silver content on solder joints is ok at around 2% total silver content. Does anyone has experience using SN62/PB36/AG2 BGAs on hard gold (10 micro inches) PCB surface finish? Any drawbacks? Thanks Joel

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#75591

Tin Lead Silver BGAs | 26 April, 2016

I've got good news and bad news: GOOD: I love Ag2 solder it's the best, most well behaved, reliable, couldn't ask for a better general purpose solder. BAD: It's leaded.

I'd be concerned about embrittlement issues when soldering to gold that was 10 thou. Consider looking at the amount of gold by weight in your solder connections. Manko [and probably others] talked about the calculation. If you can't find it, I'll help.

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#76324

Tin Lead Silver BGAs | 9 September, 2016

is there a reason you are using a hard gold finish? could you swap toa silver finish?

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