|Ask the Experts|
June 2, 2008
Leaded Solder on ROHS Compliant Parts?
Is it a problem soldering (by hand in this case) RoHS compliant parts to a RoHS compliant PCB using leaded solder?
|Expert Panel Responses|
Can't really answer that unless I know if the assembly is a RoHS part or not. If this assembly is RoHS then yes it is a problem and will put the assembly out of spec. If the final assembly is not RoHS then it is not a problem and will make the job easier using Sn/Pb solder. I assume this is PTH parts we are talking about and many of these parts are no longer available with Sn/Pb tinning or plating because it is easier to just make everything RoHS and it works in both leaded and lead-free process. As long as your assenbly does not need to be lead-free you fine to use the leaded solder and the solder joints will be just fine also.
Senior Applications Engineer
No, using leaded solders on a lead free application will work just fine. You might notice a small difference in the wetting characteristics of the assembly but just remember to keep the temperatures low and if possible use a variable power soldering iron.
Regional Sales Manager
OK International Inc.
If the product is supposed to be RoHS-compliant then yes, it is a potential legal problem because it may no longer be RoHS compliant if the product can not take advantage of the exclusion for lead in solder.
Design Chain Associates, LLC
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