IMO you should use the same alloy that you use for your reflow process. I
wouldn´t go with something special.
If you´re in need of putting non eutectic balls on that device - I can´t
suggest a tool ( haven´t done it myself ). 
For eutectic balls you don´t need preformed balls, there´s a tool, for
example from WELLER,  to print paste on the device and than reflow that
arrangement to form the balls. 
 
Hope that helps a bit
 
Wolfgang

-----Ursprüngliche Nachricht-----
Von: Van Hoang Dinh [mailto:[log in to unmask]]
Gesendet am: Dienstag, 22. Mai 2001 07:19
An: [log in to unmask]
Betreff: [TN] Re-ball BGA

Hi all,
I  got few questions about reballing the BGA.
1. If I want to re-ball the BGA, so what's alloy should use for the
balls???63/37 or 60/40 or ....
2. what's method should i use to placing the balls on the BGA if the balls
are in loose form ???
3. what ' s profile should I use for reflow the BGA's???
Thanks for your help
Van 
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