Re: [SI-LIST] : No buried/embedded capacitance?

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From: Bob Lewandowski (Bob.Lewandowski@Vixel.com)
Date: Fri Sep 22 2000 - 16:53:08 PDT


Not really. It's the total length of the current loop, not just the body
inductance of the capacitor alone. A 25 mil deep via hole at each end of the
capacitor alone will roughly double the 0.6 nH 'specified' body inductance.
That does not include the pads and traces to get from the capacitor to the vias.

For decoupling an IC lead the usual killer is the lead and bond wire inductance
back to the chip. Usually several nH.

---Bob

John Kennedy wrote:

> "Muhammad S. Sagarwala" wrote:
> >
> > 0508 caps with 1nh ESL????I am looking at the AVX specs and they list the
> > ESL to be 0.6nh.
> > I am pretty sure Murata specs them to be less than 1nh too...I would
> > recommend checking the
> > ESL spec. again...
>
> I agree that the values are lower in the specs, but I had rounded up to
> account for via/pad effects. Is this not a reasonable assumption?
>
> John
>
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