.0003 min./.0015 max.


______________________________ Reply Separator _________________________________
Subject: Minimum Solder Thickness @ Assembly
Author:  [log in to unmask] at Internet
Date:    11/21/95 9:55 AM


As fabricators, we have had it drilled into us that "flat solder is best" 
for assembly. We have never received a return from any customer for "thin 
solder", but I can't say the opposite is true. My process engineers desire 
to alter our hot air solder leveling parameters to eliminate any future 
chances of returns for thick solder. Our SPC data suggests that lowering the 
peak solder thicknesses results in exceptionally thin solder (IMO) on 
certain pad geometries. My question:
     
How thin is too thin? As assemblers, when (at what thickness or process 
conditions) would you return boards to the fabricator?
     
     
[log in to unmask] (Glynn Shaw)