# leakage current of electrolytics

Robert M. Dunn dunnr at IX.NETCOM.COM
Mon May 24 22:15:13 EDT 1999

```Larry,

Thanks for taking the time to provide this type of truly useful information
to the rest of us.  This is the type of information that cannot be obtained
from even the best Barnes and Noble bookstore or university.  Greatly
appreciated.

Rob

----- Original Message -----
From: Larry Wolken <rhys at ix.netcom.com>
To: <BOATANCHORS at LISTSERV.TEMPE.GOV>
Sent: Monday, May 24, 1999 5:32 PM
Subject: Re: leakage current of electrolytics

> Lane --
>
> I would say the electolytic leakage figure should be in the 20 MILLIamps
> range so you are probably fine.  If you can get hold a manual for for the
> Sprague TO-5 05 TO-6 there should be a table in the back or use the
> following formula:
>
> I = kC + 0.3
>
> where C = the capacitance in uF and I equals the leakage in MILLIamps and
k
> equals the following constant.
>
> 3-100 WVDC = .01
> 101-250 WVDC = .02
> 251-350 WVDC = .025
> 351-500WVDC = .04
>
> This formula determines the limit of "good".
>
> Obviously you want to give these larger caps as much as 2 to 3 minutes to
> settle down to a reading.  Don't throw out a cap based on the reading
after
> a few seconds unless you see the milliameter pinned and going nowhere.
>
> Happy leakage testing.
>
> Larry Wolken N3OJD
>
>
> ===========
> At 09:39 PM 5/23/99 -0700, Lane Zeitler wrote:
> >What is the acceptable limit for leakage current on electrolytic
capacitors?
> >The units in use are 560uF 400 volt and 470uF 450 volt.
> >
> >I am measuring around 2 to 300 hundred micramps at the max voltage
depending
> >on the one being tested and need to know if this is in the safe zone.
> >
> >Lane Zeitler
> >ku7i
> >
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```