[SI-LIST] Re: Thickness of glue used on outer layers of PCB
- From: "Loyer, Jeff" <jeff.loyer@xxxxxxxxx>
- To: "Charles.Grasso@xxxxxxxxxxxx" <Charles.Grasso@xxxxxxxxxxxx>, "si-list@xxxxxxxxxxxxx" <si-list@xxxxxxxxxxxxx>
- Date: Wed, 28 May 2014 15:05:41 +0000
Most PCB material vendors publish their "prepreg" thicknesses as well as their
"core" thicknesses, and the electrical properties of each. Typically the outer
layers use "prepregs" on the outer layers. It's common to use prepregs as thin
as 2.5 (or 2.7) mils on outer layers.
Jeff Loyer
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of Grasso, Charles
Sent: Wednesday, May 28, 2014 7:52 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Thickness of glue used on outer layers of PCB
Hello all,
When using thin (i.e ~3.5mils) dielectrics for the outer layers of (say) a 4
layer board - how thick
(typically) is the glue layer that binds the outer layer?
I am interested whether there might be a significant change in the effective
Er that will affect impedance calculations.
Thanks!
Best Regards
Charles Grasso
Compliance Engineer
Echostar Communications
(w) 303-706-5467
(c) 303-204-2974
(t) 3032042974@xxxxxxxxx
(e) charles.grasso@xxxxxxxxxxxx
(e2) chasgrasso@xxxxxxxxx
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