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Q:

How much do you derate tantalum capacitors?

A:

Surface mount tantalum capacitors typically have derating guidelines associated with them, regardless of capacitor manufacturer. The Derating guideline is different based on the cathode material used in the construction.

Derating Tantalum MnO2 Capacitors

This information applies to Tantalum Capacitors with MnO2 cathodes. For Polymer Tantalum type capacitors, see this question on Polymers.

For MnO2 based tantalum capacitors, the typical voltage derating for an application is 50% of rated voltage, for temperatures up to 85°C. For temperatures greater than 85°C, additional derating is applied.

Derate Tantalum Curve Example, KEMET T491

Figure 1 -Derate Tantalum Curve Example

Look for a derating or “recommended application voltage” section of a data sheet for more information. As an example, Figure 1 is the derating curve for a KEMET T491 Tantalum MnO2 capacitor.

Added on:

Tuesday, August 18th, 2015