Hi Mike,

I'm a little doubtful that much effect could be seen since the copper is
covered with soldermask and solder everywhere except vias.  However, if you
do verify the effect, will you let us know?  It seems like pretty important
information.

Kind Regards

Ryan Grant
Advanced Technology Engineer
MCMS
(208) 898-1145
[log in to unmask]


> -----Original Message-----
> From: Michael Forrester [SMTP:[log in to unmask]]
> Sent: Friday, May 18, 2001 8:04 AM
> To:   [log in to unmask]
> Subject:      [TN] High Freq and OSP Coated Boards
>
> We are currently designing products that have signals in the 2GHz range
> and soon
> 10 GHz.  The use of OSP
> as a surface finish was rejected for the use in such products.  The reason
> is
> that when the copper oxidizes after
> assembly the high frequency properties of the copper would change.  Does
> anyone
> have any idea at what frequency
> this effect starts and actually how much effect it has on high frequency
> signals?  Thank you.
>
> Best Regards,
>
> Mike Forrester
>
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