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Subject:
From:
Ed Popielarski <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Ed Popielarski <[log in to unmask]>
Date:
Fri, 1 Dec 2017 17:21:02 +0000
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Have you considered conformal coat the module, then hand solder with OA & wash? 


Regards,

Ed Popielarski
Engineering Manager


                               970 NE 21st Ct.
                              Oak Harbor, Wa. 98277

                              Ph: 360-675-1322
                              Fx: 206-624-0695
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"Nearly all men can stand adversity, but if you want to test a man's character, give him power."    Abraham Lincoln


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Graham Collins
Sent: Friday, December 01, 2017 9:09 AM
To: [log in to unmask]
Subject: [TN] board wash / non-washable modules - the dilemma

Hello Technet!

Wondering what other people are doing with this dilemma.

We have had several customers design in pre-built RF modules on their boards.  I totally get why, it is a pre-built, FCC approved, easy solution - the fastest way to get a good Wi-Fi or bluetooth solution.

Where things go off the rails for me are where this is used in a high humidity application (e.g. a marine setting).  We strongly prefer to wash boards, we can build no-clean if needed but I'd prefer not to for an on the water use.  But the part a customer has designed in specifically says not to wash it (it has an EMI shield, so they are properly concerned with water entrapment).

So - would you:

 - build it no-clean?
 - leave the part off, build and wash as usual, install RF module later using no-clean?
 - wash it (and maybe bake it to dry it out)?
 - ????

--
regards,

Graham Collins
Senior Process Engineer
Sunsel Systems
(902) 444-7867

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