I have a few questions regarding lead free solder process. I am so
confused  regarding the process. 
 
 
1 .Some suppliers wanting to start sending Lead free devices.
(Capacitors / resistors).  I still have a lot of product that is leaded
and the SMT process has not been changed.  
 
 
1. At what point do you change the entire process to lead free when you
start to receive lead free devices?
2. Can you mix leaded and non-leaded without changing the profile?
3. Is there a difference with actual fab manufacturing or is it just the
SMT process including solder paste changes?
 
 
 Any information on this is helpful, I have been reading the posting on
lead free thinking it may clear up a few questions,  but some still
remain unclear.
 
Thanks for your help.
 
 
David Harman
 

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