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May 2014

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Subject:
BGA Underfill material
From:
Victor Hernandez <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, [log in to unmask]
Date:
Tue, 6 May 2014 12:53:11 -0500
Content-Type:
text/plain
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Folks,

   Is BGA underfill material opaque when thoroughly mixed.   I am looking at a BGA cross section with underfill material and I see portions of solder bumps.   The underfill material at places is black to the point that I am unable to see the periphery of a solder bump.  Others places I can see portions of the solder bump.   Is this anomaly acceptable.

What does IPC Standards says.

Victor,


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