Hello,
I was browsing this datasheet:
https://www.vishay.com/docs/28407/193pursisolar.pdf
On page 3 there is a table. The 2 first columns are UR(V) and UC(V).
I know they're voltage related, but no more than that. Searching online just turns up junk results.

Does anyone know what these terms are?

Thanks!

 

The rated voltage UR is the maximum DC voltage or peak pulse voltage that may be applied continuously at any temperature within the rated temperature range TR (IEC/EN 60384-1).

The voltage rating of electrolytic capacitors decreases with increasing temperature. For some applications it is important to use a higher temperature range. Lowering the voltage applied at a higher temperature maintains safety margins. For some capacitor types therefore the IEC standard specify a "temperature derated voltage" for a higher temperature, the "category voltage UC". The category voltage is the maximum DC voltage or peak pulse voltage that may be applied continuously to a capacitor at any temperature within the category temperature range TC.

In other words, do not exceed the rated voltage over the rated temperature range.
At higher temperatures Tc , you need to derate the voltage (category voltage Uc).





Reference:
https://en.wikipedia.org/wiki/Tantalum_capacitor

 

Hello,
I was browsing this datasheet:
https://www.vishay.com/docs/28407/193pursisolar.pdf
On page 3 there is a table. The 2 first columns are UR(V) and UC(V).
I know they're voltage related, but no more than that. Searching online just turns up junk results.

Does anyone know what these terms are?

Thanks!

Look at the Quick Reference Data on the first page.



There it tells you that U_R is the "Rated voltage" and that "U_C" is the "Category voltage".

The data sheet doesn't define what "category voltage" is, but at least now you have the terminology to aid in your search.

Doing a search on "category voltage capacitor" turns up several promising hits on the first page, including:

https://en.wikipedia.org/wiki/Capacitor_types

Doing a word search for "category" within that entry takes you directly to:

https://en.wikipedia.org/wiki/Capacitor_types#Rated_and_category_voltage

 

I kinda thought in order to understand the pictured part of the datasheet that I'd have to know what Uc and Ur were. It never occurred to me that they spelled it out because there's no word beginning with U in "category voltage".

Thanks again.

 

I kinda thought in order to understand the pictured part of the datasheet that I'd have to know what Uc and Ur were. It never occurred to me that they spelled it out because there's no word beginning with U in "category voltage".

Thanks again.

U is just a common designation for voltage (like V and E are). If memory serves, it comes from a word in some other language that means "potential". It is often used in physics to denote potential energy.