Just to amplify other comments. 
Yes you can use Pb-free rated components with Sn/Pb solder. I would be
surprised if you aren't already doing so in fact in respect of the surface
finish. Many components  have never had Pb in their terminations/leads. So
that is actually no big deal.
Conversely introducing small quantities of Pb in an otherwise Pb-free
alloys, can theoretically lead to problems and may well do so in practice
according to conditions of use, amounts involved etc..

Regards 

Mike Fenner 
Indium Corporation 

T: + 44 1908 580 400
M: + 44 7810 526 317 
F: + 44 1908 580 411 
E: [log in to unmask] 
W: www.indium.com 
Pb-free: www.Pb-Free.com 



-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Balasubramanian Krishnan
Sent: 04 June 2004 14:13
To: [log in to unmask]
Subject: [TN] Mixed assembly of ROHS & Non ROHS components


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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