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Subject:	Re: SAC Shrinkage Voids in BGA Balls
From:	Ioan Tempea <[log in to unmask]>
Reply To:	TechNet E-Mail Forum <[log in to unmask]>, Ioan Tempea <[log in to unmask]>
Date:	Tue, 20 Apr 2010 16:06:10 -0400
Content-Type:	text/plain
Parts/Attachments:	text/plain (45 lines)

Inge,

Unfortunately, one of the purposers of old prunes being no good is ERSA, which brands this phenomenon a defect, called scaling. This is in the defect library they provide with ERSAscopes. I have always thought they were wrong.

Ioan Tempea, ing.
Ingénieur Principal de Fabrication / Senior Manufacturing Engineer
T | 450.967.7100 ext.244
E | [log in to unmask]
W | www.digico.cc

N'imprimer que si nécessaire - Print only if you must

-----Message d'origine-----
De : Inge [mailto:[log in to unmask]]
Envoyé : April-20-10 12:36 PM
À : [log in to unmask]
Objet : Re: [TN] SAC Shrinkage Voids in BGA Balls

High all.
Are u sure the balls are not shrinked even before soldering? I inspected
hundreds of packages before soldering and found them to be like the neck of
a Galapagos turtle. Both SAC and PbSn look all the same.
I'll send a typical picture to Steve and ask you all: do you have shrinked
balls too before action is taken?
I get question frequently from the operators, because they want see shiny
balls and not old prunes. Myself, I think the wrinkled balls has not
significance.

Inge

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