I would just like to thank everyone for so many thoughtful
responses to what I originally considered a "boring question".
I am quite surprised at the range of resin content in different
materials (and how it affects the Dk).
I guess nothing is ever easy anymore, eh?

thanks again,    Jack


> -----Original Message-----
> From: Olson, Jack C [SMTP:[log in to unmask]]
> Subject:      [DC] dielectric constant
>
> My software does some basic signal integrity analysis,
> and I just noticed it defaults the dielectric constant for
> regular FR4 to 4.7
> I was under the impression that most FR4 is at 4.2-4.3
> these days (more resin? thinner cores? can't remember...)
>
>
>

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