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Reversing tantalum caps

 
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pgsabel



Joined: 04 Jun 2003
Posts: 12


Post23 Aug 2004 12:22   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.
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echo47



Joined: 07 Apr 2002
Posts: 4205
Helped: 565


Post23 Aug 2004 16:14   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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