Hi Werner,
 
Its depending (where are the HOPs) if the warpage is concave or convex.

Best Regards
Reuven ROKAH 
e mail: [log in to unmask]
 

________________________________

From: [log in to unmask] [mailto:[log in to unmask]] 
Sent: Friday, January 18, 2008 11:00 PM
To: Reuven Rokah; [log in to unmask]; [log in to unmask]
Subject: Re: [TN] SV: [TN] SV: [TN] Solderability of Tin-Gold
Intermetallic


Hi Reuven,
When you get HOPs at the BGA corners, warpage is a good guess at the
root cause, if they are in the center than infifficient peak reflow
temperature.



Werner



**************
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