Rick,
Nothing specific about Koki, but here are some questions. Most times I have
found the solution with these questions.
1. How is the profile measured? (TC in air or embedded in board?)

2. How is the paste controlled? (Is it sensitive to moisture?)

Hope this helps.
Paul

-----Original Message-----
From: Rick Thompson [mailto:[log in to unmask]]
Sent: Thursday, January 02, 2003 3:21 PM
To: [log in to unmask]
Subject: [TN] Koki Lead-free Solderpaste?

Hi,

Does anyone have any experience using Koki Lead-free Solder Paste?  In
particular, their S3X58-M301-3 series?  We're using this at our Thailand
facility to solder some micro-BGAs and are seeing alot of voiding and
subsequent failures related to the BGA.  The balls on the BGA are eutectic,
63/37. Reflow profile is meeting the solder paste manufacturer's
recommendations.  Unfortunately, I'm trying to find an answer for  this long
distance as I'm not at the facility.  If anyone has any experience /
recommendations with this solder paste that they can share it would be
greatly appreciated.

Thanks,

Rick Thompson

Sr. SMT Process Engineer
SMTEK International, Inc.
+1 (805) 532-2800
[log in to unmask]

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