David,

   Is the flux you are attempting to removed cured?   I use a TEC-1631-16S Flux Remover G3 which works great for our application.   I too was inquiring about USC and/or stirring with temperature.

Victor,

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of David Tremmel
Sent: Friday, August 12, 2005 1:47 PM
To: [log in to unmask]
Subject: [TN] Ultrasonic Cleaning

Dear forum,

I have some microBGAs which have a no-clean flux residue which must be
removed before they can be reballed.

I have been doing my homework regarding USC (ultrasonic cleaning) and would
like opinions on whether or not putting the microBGAs in alcohol and putting
them through a US cleaning cycle for 1 minute would damage the wirebonding.

Most of what I see regarding USC is negative, but would only a minute be
damaging to the parts or does the damage occur after more time (i.e. - 3
minutes, 5 minutes).

As always, I appreciate the feedback.


David

P.S. - Ramon, you said a 15 minute soak in alcohol would do trick, right?

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