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January 2008

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TechNet E-Mail Forum <[log in to unmask]>, Hfjord <[log in to unmask]>
Date:
Tue, 8 Jan 2008 16:55:37 +0100
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I promised a simple warpage calculation formula, if not too many, I'll send
offline...
Inge

-----Ursprungligt meddelande-----
Från: TechNet [mailto:[log in to unmask]] För Werner Engelmaier /*
Skickat: den 8 januari 2008 14:15
Till: [log in to unmask]
Ämne: Re: [TN] Warpage of components

HI Ingemar,
Well said.
A warpage criterion for components would have to be based on a total 
out-of-plane measurement at soldering temperatures. This non-coplanarity
measure would 
have to be about the thickness of the solder paste layer to avoid solder 
opens, and it would have to be based on the total final solder joint
thickness to 
avoid solder joint cracking due to warpage tensile loads on cooling from 
reflow.

Werner



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