Subject: | |
From: | |
Reply To: | |
Date: | Tue, 3 Mar 1998 09:37:14 PST |
Content-Type: | text/plain |
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Jack, I'm not a materials guru, but I think the 4.7 is for the resin alone,
whereas the 4.2-4.3 is the combination of Eglass and resin and more accurately
represents the core material.
Jana Carraway
Maxtek Components Corporation
"Olson, Jack C" <[log in to unmask]> Wrote:
|
| WARNING: this is a very unexciting question...
|
| 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...)
|
| Even a brief response will be appreciated!
|
| Jack
|
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