[SI-LIST] Re: FR4
- From: "Seol Byongsu" <seol@xxxxxxxxxx>
- To: "Signal Integrity" <si-list@xxxxxxxxxxxxx>
- Date: Tue, 10 Jul 2001 14:00:47 -0800
Rich:
The dielectric constant for FR4 may vary with epoxy content,
frequency, and temperature. Below are measured properties for NEMA
FR-4 material which is an E-Glass woven fabric and fire-retardant epoxy
resin FR4:
Epoxy Content Frequency Dielectric
[volume percent] [MHz] Constant (@temperature = 295 K)
55 1 4.86
60 1 4.71
75 1 4.33
55 100 4.68
60 100 4.49
75 100 4.09
Temperature Dielectric
[K] Constant (@frequency = 1 MHz)
293 4.89
303 4.89
313 4.90
323 4.90
333 4.91
343 4.93
353 4.98
363 5.05
373 5.13
383 5.24
393 5.38
403 5.64
413 6.17
References:
- S. J. Mumby and J. Yuan, "Dielectric Properties of FR-4 Laminates
as a Function of Thickness and the Electrical Frequency of the
Measurement," J. Electron. Mater., Vol. 18, No. 2, pp. 287-292,
1989.
- Mitsubishi Gas Chemical, "BT Resin Glass Fabrics Copper Clad
Laminates," Technical Bulletin, 1996.
Hope this helps.
Thanks,
-SEOL
---------Included Message----------
>Date: Tue, 10 Jul 2001 13:57:05 -0400
>From: "Rich Peyton" <p2rich@xxxxxxxxxxxxx>
>Reply-To: <si-list@xxxxxxxxxxxxx>
>To: <si-list@xxxxxxxxxxxxx>
>Subject: [SI-LIST] FR4
>
>
>Hi
>
>what is the dielectric constant for FR4? Or a web site with listing
of
>typical materials and there constants?
>
>Thanks,
>Rich
>
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