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February 3, 2012
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Can You Mix Leaded and Lead-free?
Can You Mix Leaded and Lead-free?
Can you mix leaded and lead-free components on the same circuit board? The Assembly Brothers discuss this common request.
This program first published August 2009
Board Talk programs are presented by:

Phil Zarrow
Phil Zarrow, ITM Consulting
With over 35 years experience in PCB assembly, Phil is one of the leading experts in SMT process failure analysis. He has vast experience in SMT equipment, materials and processes.

Jim Hall
Jim Hall, ITM Consulting
A Lean Six-Sigma Master Blackbelt, Jim has a wealth of knowledge in soldering, thermal technology, equipment and process basics. He is a pioneer in the science of reflow.
Comments  »
Use the form below to submit a comment.
What are the risks of mixing SnPb and Pb-free components on a board that does not have to be RoHS-compliant? What are some of the common pitfalls that one should be aware of?

Ashwin Kasi, Tellumat, South Africa
Hello R.L.,

Here is the exemption in RoHS.

*23. Lead in **finishes of fine pitch components other than connectors with **a pitch of 0.65 mm or less** with NiFe lead frames and lead in finishes of **fine pitch components other than connectors with a pitch of 0.65 mm or **less with copper lead frames.[2010] *

There is no need for component manufacturers to follow this
exemption. It is my observation that most suppliers plate all their leads with Matte Tin regardless of the pitch.

You should read the RoHS document, it isn't that long.


Jim Hall, ITM Consulting
Recently you commented on using leaded and lead-free components on the same assembly. You said that fine pitch parts, those whose pitch is .65 mm or less, were exempt from RoHS requirements as far as the plating on the leads. Please tell me where I can find this exemption written.

Ralph Longton, LoJack Corp
Do you have results of mixing lead and lead-free components, so that I can keep the company I work for from doing this.

Asalene Coffey
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Can You Mix Leaded and Lead-free?

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