Have a look at FR408. It's more like N4000-12 electrically.  However, both
FR408 and -12 have been close enough to -13 electrical performance to drop
in as replacements in our sub-2GHz applications.  Both FR408 and -12 have
similar innerlaminar bond strength as N4000-6.  That is nearly double the
inner laminar bond strength of -13.  Equally important in multi-lam single
ply uVia build up constructions has been -12 and FR408's (apparently) lower
delam sensitivity to retained moisture. -13 is not very hydroscopic but it
will separate from it's glass sooner than 408, -6 or -12 if there is
retained moisture.

We've used a ton of -13 over the years and still use it in selected
applications for it's higher Tg and marginally lower loss but if it's
single ply and sequential lam FR408 or -12 are the way to go.

my $.02,
dw

At 10:21 PM 2/27/2006, Ofer Cohen wrote:
>In similar occasion of similar frequency (3.125GB/s) we've declined
>IS410 and other, and approved IS620 and Nelco 4000-13. We are checking
>no Nelco 4000-12 which is supposed to be electrically equivalent to the
>-13 but chipper and LF compliant.
>
>Regards
>Ofer Cohen
>Manager - Quality Assurance and Reliability
>SIEMENS COM FN A SB
>
>-----Original Message-----
>From: TechNet [mailto:[log in to unmask]] On Behalf Of Michael Dunn
>Sent: Monday, February 27, 2006 22:40
>To: [log in to unmask]
>Subject: [TN] High-frequency losses (e.g., SATA)
>
>Hello from a new member.
>
>We're wanting to run 1.5Gbps (differential) SATA signals over a
>backplane, and naturally have SI concerns.  The distance will be up to
>15".  We're considering IS410 and IS620 (620 has about 2.5x less loss).
>
>I've tried using calculators from Rogers and Isola, but for some reason,
>they only report losses in single-ended lines.
>
>Can anyone share experiences, or suggest other tools that may be of use?
>
>
>Thanks!!!
>
>
>
>Michael Dunn
>Sr. Hardware Engineer
>Kaleidescape Canada Inc.
>611 Kumpf Drive, Unit 100
>Waterloo,  ON N2V 1K8
>Canada
>Ph: 519-772-6427
>Fx: 519-772-6401
>
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