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Subject:	Re: Dielectric Strength
From:	Brian Ellis <[log in to unmask]>
Reply To:	TechNet E-Mail Forum.
Date:	Thu, 27 Sep 2001 17:13:28 +0300
Content-Type:	text/plain
Parts/Attachments:	text/plain (49 lines)

Barry,

This data will be in laminate manufacturers data sheets and can vary
much from one manufacturer to another. If you are wishing a precise and
constant electrical capacity, forget it. The dielectric constant can
vary much according to the manufacturer, the batch, the absorbed
humidity and the temperature. Epoxy resins do not make good capacitors
(have you heard of an epoxy capacitor as a component?) and the power
factor is very poor, to boot.

Brian

"Darnell, Barry (IndSys, GEFanuc, CDI)" wrote:
>
> Can someone tell me the dielectric strength (how many dc volts per mil,
> layer to layer) can FR-4 handle?  Also, I need to create a capacitor between
> two pieces of copper
> on opposite sides of the board.  How do I calculate the size of the copper
> to achieve a given capacitance.
>
> Thanks,
>
> > Barry Darnell
> > (864)627-8800 Ext. 217
> > mailto:[log in to unmask]
> > Computer Dynamics, Inc.
> > Printed Circuit Board Designer
> >
>
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