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Compatibility of Pb-free parts and non Pb-free board mount

 
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alan
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Posted: Tue Aug 30, 2026 2:05 pm    Post subject: Compatibility of Pb-free parts and non Pb-free board mount
 
Hi,
Can anyone advise me these questions as following?
1. Pb free components can be soldered using existing Sn-Pb solder and temperature profiles. This means its Pb free parts can be used on current non-Pb free process without any risk.
2. Non-Pb free components can be soldered using lead-free solders and the appropriate higher temperature profiles. This means its non-Pb free parts can be withstand Pb free temperature profile without problem.

I suffered customer's inquirement and they want to make sure that's no problem. Thanks!!
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Rel Eng
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Posted: Tue Aug 30, 2026 2:53 pm    Post subject:
 
Statement # 1 is true, Pb-free parts are qualified to withstand higher soldering temps (250-260 C).

Statement # 2 is false, non-Pb-free parts may not be able to withstand the Pb-free temp profiles, since non-Pb-free parts were qualified using lower peak temps (220-235 C).

Rel Eng
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Posted: Thu Sep 29, 2026 6:24 pm    Post subject:
 
Pb-free product has "whisker" problem. Be careful of that.
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