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Lead Free Component Finishes?

Steve

#31244

Lead Free Component Finishes? | 6 November, 2004

Hello all you knowledgeable people. Got a customer who makes components. Asked the question what are manufacturers of components plating their lead with? Tin? Nickel? I heard possibly Paladium but don't know much about paladium. And of course the big question. What problems may occur with each plating going lead free. Thanks in advance.

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Wixon

#31259

Lead Free Component Finishes? | 8 November, 2004

Typically lead is plated with tin. One problem with using just tin plating is that you can grow "wiskers" over time, and potentially develop a short somewhere on your PCB. SMTA is giving a presentation on the effects of lead-free solderability.

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steve

#31260

Lead Free Component Finishes? | 8 November, 2004

ok, thanks for the input. So what do we use if we don't use Tin?

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#31262

Lead Free Component Finishes? | 8 November, 2004

Your customer's cost will increase. Consider: * The majority of no-lead components have matte tin solderability protection. Bright tin, as mentioned by an earlier poster, has had reliability issues. Many component suppliers have documented their reliability testing of components with matte tin. [Although, this testing seems to be quite superficial.] * TI have been a leader in the use of Pd solderability protection for at least ten years. * Certainly, another alternative is the SAC solder that most assembles use in their processes. * Ni corrodes easily and must be protected, most often with Au.

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steve

#31266

Lead Free Component Finishes? | 8 November, 2004

As usual, a big thank you for the education. You make me look good in front of the customer.

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Reflow Oven

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