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How far can a polarized tantalum cap be used in reverse?

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pgsabel

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Reversing tantalum caps

Is there any rule on how far a polarized tantalum cap can be used in reverse?

I have a case where it may need to work in reverse, but only up to the tens of mV. Maybe a worst-case pulse of 100mV, which would be an extremely rare occurance only lasting a couple of seconds.

I know a nonpolarized cap would be the first choice. I'm looking at this possibility since I might need a rather high capacitance and low leakage component for this app.
 

Reversing tantalum caps

I don't know if there's a general rule, but Kemet's "application note for tantalum capacitors" says you can apply momentary reverse voltage up to 15% depending on temperature. See section 11:
http://www.kemet.com/kemet/web/homepage/kechome.nsf/vapubfilesname/F3100ETaLdPerChar.PDF/$file/F3100ETaLdPerChar.PDF

We all know what happens if you apply too much reverse voltage!
 

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