> Can one really mix no-lead RoHS compliant SMT parts along with ones that
> have lead in the pins in a reflow oven?

Yes, with caveats.  Different lead platings have different levels of
compatability
with different processes:
1.  SnPb plated components WILL work with lead-free solders, HOWEVER,
the reflow temps required for lead-free solders may be higher than a SnPb
plated part will allow, and the board will no longer be RoHS compliant;
2.  Sn or NiPdAu plated components will work with SnPb solders with no
changes required to the process.

Other lead-free finishes may vary in their backwards compatability with lead-
bearing solders; check with a manufacturer for details.

Mike H.
-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist