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August 2001

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Subject:
From:
David Douthit <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Wed, 15 Aug 2001 09:09:58 -0700
Content-Type:
text/plain
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text/plain (145 lines)
Grant,

Is the unit hermetically sealed? If so is he board baked prior to sealing and are you using dry nitrogen or something simular?

If not then moisture/contamination issues can cause problems.

David A. Douthit
Manager
LoCan LLC

Grant Emandien wrote:

> Brian,
>
> Thanks for the response - the unit operates between -40deg.C to 60deg.C
>
> -----Original Message-----
> From: Brian Ellis [mailto:[log in to unmask]]
> Sent: Wednesday, August 15, 2001 12:29 PM
> To: [log in to unmask]
> Subject: Re: [TN]
>
> Grant
>
> You have a few problems, but nothing very severe. I agree that at 5 GHz,
> "no-clean" is a no-no. However, I'd be concerned with FR-4 at those
> frequencies as the Zo of your tracks can vary considerably with
> humidity. What is unclear is whether the product operates at ONLY -40°C
> or whether at higher temps, as well. If only there, then my guess is
> that you have no specific W/S flux-related problem. A Mr. Arrhenius told
> me that you should have much reduced corrosion risks and that cleaning
> and excellent drying with adequate equipment (i.e., 10% of what is
> available on the market) will give you the required results. Ionic
> contamination testing would be adequate for process control, once you
> have established your qualification conditions.
>
> Brian
>
> Grant Emandien wrote:
> >
> > Hi all out there,
> >
> > One of our customers is concerned with the level of flux residue (no
> clean)
> > present on RF boards - concern that the flux characteristics negatively
> > affects circuit perfomance (FR4 material, HASL finished is being used for
> > circuitry operating at 5GHz). He has thus requested to rather assemble
> using
> > water-soluble flux. With water-soluble flux of course comes cleanliness
> > issues which may result in latent defects due to entrapped corrosive flux
> > residue. The product is spec'd to operate, uncoated at -40deg.C. Any
> > insights into this dilemma?
> >
> > Thanks in anticipation.
> > Grant
> >
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