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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?
Dennis Sitongia
Scientech, Inc.
This "Ask the Experts" page has been viewed 637 times.
Ask the Experts Comments
June 2, 2008
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.
Michael Kirschner, President
Design Chain Associates, LLC
 Mr. Kirschner is President of Design Chain Associates, LLC, focused on helping electronics OEMs comply with RoHS/WEEE requirements, and speeding time-to-market, reducing product cost, and increasing engineering and procurement efficiency. Mike has extensive experience in all phases of the product lifecycle at both Electronics OEMs and semiconductor suppliers.
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June 2, 2008
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.
Edward Zamborsky, Regional Sales Manager
OK International Inc.
 Mr. Zamborsky serves as one of OK's technology advisors to the Product Development group. Ed has authored many articles, and has presented many papers on topics such as; Low Volume SMT Assembly, Solder Fume Extraction, SMT Rework, BGA Rework, Lead Free Hand Soldering, Lead Free Visual Inspection and Lead Free Array Rework.
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June 2, 2008
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.
Kenneth Kirby, Applications Engineer
Speedline Technologies
Mr. Kirby has been in the electronics manufacturing industry for 18 plus years. Over the years Ken has been in roles such as Equipment and Process trainer, Senior Process Engineer, R&D Application Development Engineer and currently Process Application Engineer.
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