I have no actual experience with this, however, from what I have learned in following this list and the LeadFree list is that if you use components with Pb (lead) based finishes on the leads in a lead-free process, the reliability of the solder joints is questionable. 

If you use lead-free finishes in a tin-lead soldering process effect is minimal. 

Others on this list can explain why, and you may be able to find that information in a search of the archives.

Bottom line is if you are using a lead-free soldering process, it is highly recommended that all components used are also lead-free. If you still have a tin-lead process, you can mix.

Blair Hogg
QA Manager
GAI-Tronics Corp.

>>> [log in to unmask] 06/04/04 09:13AM >>>
Dear Experts,

      Is it possible to use some normal components (with lead) along with
lead free components in the same PCBA. Since the tempertaure requirement of
lead free components is higher will it affect the normal components? Or is
it possible to assemble normal components first and then lead free next in
two steps. Please guide me.

Sincerely

K.Balasubramanian
Sr.Engineer, Hardware.

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