Dr. Henning Leidecker at Nasa is doing a study as we speak on
Tin Whisker risk mitigation by different types of Conformal Coating. The
understanding is that CC does mitigate Tin Whiskers. If nothing else, it
will not allow a whisker to touch another lead after it has poked
through the CC at its root.
Ramon
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Stadem, Richard D.
Sent: Friday, September 15, 2006 6:32 PM
To: [log in to unmask]
Subject: Re: [TN] bareboard cleanliness related to surface finish
George hit it right on the head. Many OEMs are adding a hard coating in
the hopes that it will provide longer cycles to failure. Does anyone
know if there is data that supports this, or disproves it?
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Wenger, George M.
Sent: Wednesday, September 13, 2006 7:58 PM
To: [log in to unmask]
Subject: Re: [TN] bareboard cleanliness related to surface finish
John,
I love your sense of humor. Unfortunately, there is always some truth
in humor.
-----Original Message-----
From: John Burke [mailto:[log in to unmask]]
Sent: Wednesday, September 13, 2006 8:49 PM
To: 'TechNet E-Mail Forum'; Wenger, George M.
Subject: RE: [TN] bareboard cleanliness related to surface finish
It's to stop the components falling off when the lead free joints
fail?????
Almost Friday somewhere in the world..........8-)
John
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Wenger, George M.
Sent: Wednesday, September 13, 2006 5:40 PM
To: [log in to unmask]
Subject: Re: [TN] bareboard cleanliness related to surface finish
William,
I've noted that there have been several requests on TN recently about
conformal coating. I don't have enough experience with conformal
coating to be able to provide useful information but I am curious why
your several customers are asking for conformal coating on their PCB
assemblies. Do you know if there requests are due to deployment of
their products in environments that don't have good air quality (i.e.,
Asia-Pacific, India, etc.)?
Regards,
George
George M. Wenger
Andrew Reliability/FMA Engineer
40 Technology Drive, Warren, NJ 07059
(908) 546-4531 [office] (732) 309-8964 [mobil] -----Original
Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of [log in to unmask]
Sent: Wednesday, September 13, 2006 7:28 PM
To: [log in to unmask]
Subject: Re: [TN] bareboard cleanliness related to surface finish
Hi Folks: My company is beginning to be asked by several customers for
conformal coating on their PCB assemblies. We are currently building
to IPC-A-610 using a combination of SMT and T/H technology in a no-clean
manufacturing process flow. From my old PCB days, I remember problems
with PCB cleanliness and conformal coating peeling off the PCB surface.
What are folks using today for a conformal coating in a no-clean
manufacturing environment? Do I need to worry about cleanliness at all
today? With RoHS and lead-free processing/PCB finishes how are surface
contamination levels affected??
I'm just looking for some basic information to point me in the right
direction.....rather not have to re-invent the wheel. Thought this
would be the perfect forum for this type of question!!!!
Thanks in advance for any help and guidance you folks may provide!!!!!!!
Sincerely,
William E. Black
Medco
Quality Assurance Manager
Tel: 1 631 667 9699
e-mail: [log in to unmask] (mailto:[log in to unmask])
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