My reading of SMT magazine
http://smt.pennnet.com/home.cfm
suggests that there is no problem
with using lead-free with leaded systems. The problem is lead
parts in lead-free systems. Lead-free requires much higher
soldering temperatures, and the lead leaches into the l-f solder
causing problems with crystalization leading to bad joints.

http://smt.pennnet.com/Search/Search.cfm?Section=Search&searcharea=Articles&keyword=leaded+lead-free&submit.x=0&submit.y=0
http://www.circuitsassembly.com/online/0310/0310willis.shtml
http://www.smtinfo.net/Db/_Soldering.html

R

Marcel Duchamp wrote:

> Does anyone here have knowledge on mixing  lead-free parts with 
> conventional solder parts?
> 
> Parts used to be described with no attribute here; now most I'm looking 
> at say either "sn-pb solder" or "lead free".
> 
> We are still working with sn-pb solder based processes here and I'm 
> wondering if there is any reliability problems with using lead-free 
> parts along with the usual solder parts.
> MD

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