Phil,

Did I miss something on TN?  You made the comment that "Sn100C is less
expensive than SAC 305(the IPC alloy of choice)."  Has the IPC come out
and indorsed SAC 305 for Pb-Free wave soldering?  I know the IPC Solder
Products Value Council has indicated that "the  96.5/3.0/0.5 SAC alloy
be the lead free alloy of choice for the electronics industry" but that
was based on their surface mount assembly and reliability evaluation not
on a wave soldering evaluation.

Regards,
George
George M. Wenger, Andrew Corporation
Reliability / FMA Engineer
Base Station & Subsystems Group
40 Technology Drive, Warren, NJ 07059
(908) 546-4531 [log in to unmask]
 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Phil Nutting
Sent: Tuesday, October 11, 2005 3:14 PM
To: [log in to unmask]
Subject: [TN] SAC 305 versus Sn100C

Here is my question for the afternoon,
 
I know the answer is "it depends", but I need some more information to
help with the decision process.
 
I just took delivery of a new wave solder machine set up for SAC 305.  I
have not yet purchased solder or flux.
 
Our CM is using Sn100C.  I know Sn100C is less expensive than SAC 305
(the IPC alloy of choice).
 
Is there going to be a long term issue if Sn100C and SAC 305 get mixed
together via hand soldering?
 
Is the Sn100C process more forgiving than that of SAC 305?
 
Are there fluxes out there that work better in a foam application?
 
I'd like to figure this out before ordering 600 pounds of bar solder.
 
Thanks in advance,
 
Phil Nutting

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