Gabriela, I do know of BGA manufactures using a SAC105 and other SAC alloys.
The reason they are doing so is for shock reliability.  The SAC105 out
performs the SAC305 in shock tests.  You shouldn't have any difficulty using
this alloy with your leaded paste.  It should be relatively the same as a
SAC305 BGA with better performance.     

Christopher J. Nash 
Mid-West Technical Support Engineer
Indium Corporation of America 
Phone #: (315) 853-4900 x7521
Fax #: (315) 853-1000
www.indium.com


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Gabriela Bogdan
Sent: Friday, March 30, 2007 7:18 AM
To: [log in to unmask]
Subject: [TN] Alternative SAC

Dear Technetters:
Do you know if SnAg1Cu0.5 alloy is being used by BGA manufacturers instead
of SAC 305?
If so, what impact does it have on the mixed assembly solder profiles?
We use a peak temperature of 232C on the lead free BGA top, for lead free
BGA's on leaded solder paste on mixed assemblies.
Is the information usually available on the data sheets?
(Yesterday....)
Gaby

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