The manufacturer of the edge board connector changed the US machine to one with a higher power level and did not do a requalification of the part. The higher energy caused the contact fingers to fatigue since they had no support. We had no hint of a problem until the field failures started to come in. It cost us over $ 20 million to find and replace the units in the field.
**************************
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 John Burke
Sent: Tuesday, August 16, 2005 4:07 PM
To: [log in to unmask]
Subject: Re: [TN] Ultrasonic Cleaning
Think he actually says Assembled using ultrasonics, as in ultrasonic
welding?
John
------------------------------------
Avanex
John Burke
Senior Manager RoHS Compliance
[log in to unmask]
40919 Encyclopedia Circle
Fremont
CA 94538
tel: 510 897 4250
fax: 510 979 0189
mobile: 510 676 6312
------------------------------------
-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Stadem, Richard
Sent: Tuesday, August 16, 2005 1:01 PM
To: [log in to unmask]
Subject: Re: [TN] Ultrasonic Cleaning
Hi, Fred
I am assuming you are talking about a connector that was ultrasonically
attached, not cleaned ultrasonically?
Did you qualify the process?
If you are talking about a connector that was standard SMT, and you cleaned
it using US, what was the fail mode? Broken contacts, solder fractures? I
have never heard of a purely mechanical device being damaged by US. Not
saying it could not happen, just wondering about the details so I can avoid
this.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Frederick Miller
Sent: Tuesday, August 16, 2005 2:40 PM
To: [log in to unmask]
Subject: Re: [TN] Ultrasonic Cleaning
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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