[SI-LIST] Re: Low-leakage PCB materials
- From: Rick Collins <gnuarm.2006@xxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Tue, 20 Dec 2011 14:07:02 -0500
Really? Uninsulated guard rings at up to 10 kV? I think the problem
he is facing is not like a very high impedance input where you use
guard rings to prevent leakage into the high impedance, but rather
the issue of a high voltage creeping across the board, no?
Rick
At 01:58 PM 12/20/2011, DAVID CUTHBERT wrote:
>Guard rings may be the answer. Remember to not cover them with solder mask.
>
>Dave C
>On Dec 20, 2011 11:56 AM, "Rick Collins"
><<mailto:gnuarm.2006@xxxxxxxxx>gnuarm.2006@xxxxxxxxx> wrote:
>I suppose it has its own cost and other issues, but isn't conformal
>coating typically used for high voltage work? That should also deal
>with the moisture adsorption problem. Just don't try to rework the
>boards, I understand that can be a real PITA.
>
>Rick
>
>
>At 04:39 AM 12/20/2011,
><mailto:Wolfgang.Maichen@xxxxxxxxxxxx>Wolfgang.Maichen@xxxxxxxxxxxx wrote:
> >Not perfectly SI-related but I figured there are enough PCB
> >manufacturing experts around on this list to warrant a question:
> >
> >What are good materials for low-leakage, high-voltage (2-10kV)
> >applications? The standard solution here has been to use Rogers
> >material (not for SI - the application is very slow speed, a few MHz
> >at best - but purely for leakage reasons), but of course this is an
> >expensive approach. Can anybody recommend a less pricey material
> >that nevertheless offers very low leakage and doesn't have issues
> >with moisture absorption (like FR-4 has)? The boards are multi-layer
> >(typically 6-10 layers).
> >
> >Thanks in advance,
> >
> >Wolfgang
> >
> >
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