Geert, can you divulge the manufacture or manufactures? We use many
Vishay components. Thanks, Jon

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Geert Willems
Sent: Saturday, June 21, 2008 7:28 AM
To: [log in to unmask]
Subject: Re: [TN] SAC Plated Passives with SnPb Solder Paste

Yes, there is at least one issue: we have observed massive tombstoning 
happening with these components when soldered with SnPb. My explanation 
for the high tombstoning level: SAC plating melts above SnPb melting 
temperature in the sharp rise to peak temperature leading to a sudden
change 
in wetting behavior of the component leads. As a result, an imbalance in

temperature/timing between both passive's ends gives a high probability
of 
tombstoning.

Geert Willems
IMEC

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