RE: [N8VEM-S100:6375] Discussion About Filter Capacitors

Hi Don,

I think the days of the Tantalum might be coming to an end. I read this post from Lee Hart on the SEBHC group....

"Today, we can get ceramic capacitors that are just as small as tantalums,
and even better with regard to leakage, high frequency performance, and life.
The ceramics are also non-polarized -- it doesn't matter which way they go in! :-)
I bought a bag of 4.7uF 25v ceramics and have been using them to replace small
tantalums and electrolytics (Mouser 810-FK14X7R1E475K, $0.153 each for 100)."



I am certain these ceramic capacitors will out perform the Tantalums for a fraction of the price.

Regards,
Josh

> Date: Fri, 20 Feb 2015 11:45:34 -0800
> From: ilv...@gmail.com
> To: n8vem...@googlegroups.com
> Subject: [N8VEM-S100:6375] Discussion About Filter Capacitors
>
> I may be trying to over simply this. Each circuit will have different
> requirements
> with load playing a part in that. I'm ready to get schooled on the topic.
>
> I see most of our S100 circuits using .1uf and .33uf for filtering the
> VI and VO
> on 78xx regulators. I believe this originates from the LM78xx data sheets.
>
> These capacitors are typically electrolytic because of there ability
> to filter out low frequency ripple and respond to fast load changes.
> Electrolytic are not good at filtering higher frequency due to their
> higher ESR.
>
> Tantalum's are used because they have lower ESR. Multilayer ceramic
> also have low ESR and are suppose to be good because they have
> excellent high frequency response and noise filtering.
>
> I've seen comments that modern day 1uf can be used instead of .1uf.
> The modern day ceramic 1uf's have much better noise performance and
> low inductance than used to be the case.
>
> So my question is, can I feel confident using ceramic disc capacitors
> in this application instead of Tantalum? Tantalum tend to be a bit pricey.
>
> Thanks in advance for your comments/suggestions/recommendations.
>
> --
> Don Caprio
> ilv...@gmail.com
>
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