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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