OK, from yet another dinosaur to another, (I guess) that's what I thought you said too Jack... :-) :-)
On top of that, it has nothing to do with non-functional pads either! Just saying...and also covering the next phase of questions before they get asked, just in case... :-) :-)
Is it Monday already??? Oh man, it IS.....
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-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Jack Olson
Sent: Monday, March 05, 2018 10:12 AM
To: [log in to unmask]
Subject: [External] Re: [TN] Conformal Coating on Edge of CCA
I agree!
I meant to say that if the edges are conductive, they might need to be exposed (wait a minute... that IS what I said!)
thanks,
Jack
On Mon, Mar 5, 2018 at 10:18 AM, Douglas Pauls < [log in to unmask]> wrote:
> Well Jack, sometimes the board edges are metallized so that it serves
> as a grounding path and sometimes as a thermal conduction path. In
> those cases, the presence of conformal coating interferes with the
> function of the board and so it should not be present. That is
> usually the question I ask designers all the time - will conformal
> coating in Location X interfere with the form, fit or function of the
> unit. If yes, then it is a keep out zone.
>
>
> Doug Pauls
> Principal Materials and Process Engineer Rockwell Collins
>
> On Mon, Mar 5, 2018 at 10:00 AM, Jack Olson <[log in to unmask]> wrote:
>
>> Typically the goal is to protect conductive surfaces, and board edges
>> don't often have conductive surfaces (and if they do, they might need
>> to stay exposed).
>>
>> If you have seen the board edges coated it is probably a result of
>> the method that was used to coat them (spraying or dipping), not
>> because it was required.
>>
>>
>>
>> On Thu, 1 Mar 2018 09:45:26 -0600, Caitlen Gahm <
>> [log in to unmask]> wrote:
>>
>> >Greetings,
>> >
>> >We are wondering what the general thought is regarding whether or
>> >not
>> the edge of a CCA/PWB needs to be conformally coated? We received
>> CCA's from a supplier and noticed that the edges were not coated.
>> Our thinking thus far is that since our drawing does not state that
>> coating on the edge is optional or not required, it would be required.
>> >
>> >What we are curious to know is what the general consensus is
>> >regarding
>> whether or not it is necessary to coat the edge of the CCA and
>> instances when this would or would not be desired.
>> >
>> >Thank you,
>> >Caitlen Gahm
>> >Materials and Process Engineer
>> >Crane Aerospace & Electronics
>>
>
>
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