[SI-LIST] Re: What is the acceptable minimum pre-preg thickness for volume manufacturing?

  • From: "Hill, John" <John.Hill@xxxxxxxxxx>
  • To: <aminotg@xxxxxxx>, <si-list@xxxxxxxxxxxxx>
  • Date: Thu, 31 Aug 2006 11:32:49 -0400

Gilles,

Check out FaradFlex. It starts at 1 mil (BC24, 24 micron) and yields a
capacitance of 1nF per square inch.=20

http://www.oakmitsui.com/pages/advancedTechnology/faradFlex.asp

However, I am concerned for the self-resonance frequency of the Path
Antenna formed when using the higher Dielectric materials. After talking
with one of our RF guys, he expects the frequency to be lower due to
slower propagation speeds. It will make the patch look bigger
electrically and lower the self-resonance frequency.

Best regards,

John




=20

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-----Original Message-----

From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of Gilles Aminot
Sent: Wednesday, August 30, 2006 10:44 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] What is the acceptable minimum pre-preg thickness for
volume manufacturing?

Hi All,
Is there a PCB guru out there who can tell me what is the minimum
recommended pre-preg thickness for volume manufacturing? I want to
increase inter-plane capacitance by reducing the pre-preg thicnkess
between my power and ground planes. Currently we are using a pre-preg
thickness of 4mils. I did some research and found that pre-preg comes in
thicknesses as low as 2mils. Can we go as low as 2mils between planes on
an FR-4 PCB designed for RoHS compliance and still have a board which
can be reliably built in high volume?=20

Thanks in advance for your replies.

Kindest Regards,
Gilles Aminot

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