The Many Benefits of FeedThru Capacitors

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Barbara Jorgensen
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Ron Demcko reponds
Barbara Jorgensen   8/12/2011 11:23:10 AM

Ron is traveling, but was kind enough to ask me to post his reponse below:


If you want to create a low frequency feedthru a ferrite material is sometimes formed around the feedthru  input & output lines. This is expensive and does add cost. Traditionally this has been the method to get a low frequency response. 

Another way to accomplish this - a new metod - (at least to some extent) is to use internal electrodes with maximized inductance. The limitation to that approach is that it can not get to the very low frequencies - its probably got a practical limitation of 20 mhz today but I could see that extending to 10 mhz in the fairly near future. This method essentially is a balance beem - we could get to < 10 mhz but feedthru current gets limited so my bet is there will be series of different feedthru current capable parts with different low frequency response cut offs. 


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FLYINGSCOT   8/10/2011 4:20:09 AM

Great article. I agree there are many benefits of feedthru caps.  In many applications they offer the best compromise between filter performance, board space and cost.  Just make sure to understand the electrical specs of the device chosen to make sure it can deliver what is expected in terms of system performance.  If it does not there are many other types of in-line filters (including active solutions) that might do the job.

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Re: The Many Benefits of FeedThru Capacitors
Clairvoyant   8/9/2011 6:29:07 PM

I have had experience with feed-thru capacitors myself and have seen their advantages. They are very handy is providing filtering for signals that are feeding into an RF isolated section of a product.

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The Many Benefits of FeedThru Capacitors
Hospice_Houngbo   8/9/2011 11:02:59 AM

Hi Ron,

Thank you for this blog as it reminds me many things about my Electronics Engineering courses. 

FeedThru capicitors filters seem to be well suited to high frequency applications than low frequency applications and there is the need to add other capacitors in order to use them for low frequency applications. My question is: Do low frequency FeedThru and high frequency FeedThru cost the same thing? I suspect that low frequency FeedThru might be more expensive. Am I right?

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