We had a problem with a connector that was damaged when it was assembled using ultrasonics. The problem did not appear until after the system was in use by the customer. You need to know where the energy is going and if you are degrading the fatigue life of the internal assembly in any way.

************************** 
Frederick H. Miller PE
Astrolab, Inc. 
4 Powder Horn Drive 
Warren, NJ 07059 
Tel: 732-560-3800 
Fax: 732-560-9570 
www.astrolab.com 
[log in to unmask] 
***************************** 



-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Brian Ellis
Sent: Saturday, August 13, 2005 3:24 AM
To: [log in to unmask]
Subject: Re: [TN] Ultrasonic Cleaning


Damage may occur in a few milliseconds. It depends on at least 10 
factors, some of which are imponderable, such as where the nuclei are 
that trigger the cavitation.

Brian

David Tremmel wrote:
> 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?
> 
> _________________________________________________________________
> ¿Cuánto vale tu auto? Tips para mantener tu carro. ¡De todo en MSN Latino
> Autos! http://latino.msn.com/autos/
> 
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