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June 2009

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From:
"Stadem, Richard D." <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Stadem, Richard D.
Date:
Thu, 25 Jun 2009 13:01:01 -0500
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Thanks, I like that language, Dewey.  
In any case, to help Ioan in his initial question; there can be no concrete, comprehensive standard that works for everything when it comes to conformal coating. The requirements need to be tailored AABUS. They seldom work perfectly as defined on the print during the first build, thus the "out card" where any deviations are documented, adjudicated, and approved by the customer before shipping the assemblies.

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Whittaker, Dewey (EHCOE)
Sent: Thursday, June 25, 2009 12:33 PM
To: [log in to unmask]
Subject: Re: [TN] Conformal coating coverage

I changed Richard's note to be in line with the new approach. After it I added a note I add to all drawings that may have need of the wiggle room or a get-out-of-jail-free card.

The conformal coating requirements shall be defined and documented on the PBA (printed board assembly) drawing.

Deviations to these requirements shall be AABUS.

 

Conformal coating may or may not be present in non-critical laminate areas of the PB (printed board) or on the top and side of non-critical, non-conductive surfaces of large scale packages, unless otherwise specified. This exception is for the coating coverage requirement and shall not be used to accept uncoated areas due to bubbles, voids and other workmanship issues. 

 

Dewey

 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Stadem, Richard D.
Sent: Thursday, June 25, 2009 9:28 AM
To: [log in to unmask]
Subject: Re: [TN] Conformal coating coverage

 

That may not be covered under any standard, because the requirements for CC coverage vary by component, assembly, program, customer, and usage requirements.

Usually, coating over the component body has no value added, as most component bodies are impervious to moisture. The primary purpose of the CC is to prevent moisture buildup on the metal terminations and solder connections on the CCA. 

The coating requirements need to be defined and agreed upon between the user and the supplier (AABUS) and documented on the CCA drawing. They are unique and specific to the product.

 

 

-----Original Message-----

From: TechNet [mailto:[log in to unmask]] On Behalf Of Ioan Tempea

Sent: Thursday, June 25, 2009 10:51 AM

To: [log in to unmask]

Subject: [TN] Conformal coating coverage

 

Dear Technos,

 

 

 

Since the PCB edges have been already discussed, I would like to get your input on tall components coverage. Do tall parts, like radial TH parts, inductors, electrolytic caps, etc. need to have the vertical sides coated? What about the coils with apparent windings?

 

 

 

IPC-610 is not detailed at all at this level and I have quickly browsed IPC-HDBK-830 without being able to find anything. What would be the IPC or MIL standard covering this particular issue?

 

 

 

Thank you, 

 

 

 

Ioan Tempea, ing.

 

Ingénieur Principal Fabrication / Sr. Manufacturing Engineer 

 

 

 

 

 

30 ans déjà! - Already 30 years!

 

950 rue Bergar, Laval, Québec, H7L 5A1

 

t : 450-967-7100 ext : 244

 

Mtl : 514-990-5762

 

f : 450-967-7444

 

[log in to unmask] <mailto:[log in to unmask]> 

 

www.digico.cc <http://www.digico.cc/> 

 

P N'imprimer que si nécessaire - Print only if you must

 

 

 

 

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