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# does voltage matter in a capacitor or is it only uf? Answered

ive seen volt numbers on capacitors but people mostly just mention uf. but the uf is the same but the size of the cap looks different. does voltage matter?

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## 12 Replies

The voltage rating for a capacitor is the maximum voltage you can apply without breaking the capacitor.

If you do not see why that number, the voltage rating,  is meaningful, consider something similar like the pressure rating for a tank that holds compressed air. Does it matter how big the tank is? Does it matter what the highest pressure the tank can withstand without breaking? The answer to both is yes. Both of these numbers are meaningful. Both matter.

seandogue (author)2010-09-21

+1

rpermejo (author)2018-02-24

can i replace 120uf 450v 105c electrolytic capacitor but different packaging sizes?

jeff-o (author)2010-09-22

Yes, voltage matters very much. If you expose a capacitor to a higher voltage than it's rated for, it'll probably blow its top. So, make sure that the voltage rating on the cap is greater than the voltage you're expecting it to handle. For example, that 6.3V cap would be perfect for 5V circuits or less.

Also be aware that some capacitors are polarized, and some are not. In the picture above, you can see a band of "-" signs indicating the negative pin of the capacitor. Again, make sure it's hooked up the right way or it may rupture or explode.

MatthewN20 (author)2016-11-05

Jeff-o i know this is kind of old but i use a lot of 5v stuff. just to make sure im correct as long as my compacitor ratting is greater then 5v. im ok as long as i only use a 5v source?

Gursimran Singh 425 (author)2015-10-08

Sir,I bought a capacitor with rating 63v but I had to use 16v so will 63v work perfectly in place of 16v???? Thank you too much! !

jeff-o (author)2015-10-08

Yes, you can use a 63V capacitor in a 16V system.

MarkS497 (author)2016-06-21

Replacing both power supply caps on 100 watt Crest pwr. amp. I orderd 10,000Uf 67wvdc . Received 10,000 Uf 63 wvdc......will they work?

DavidT330 (author)2016-05-10

I am using a different voltage capacitor for a 555 timer circuit, the cap I am using has greater voltage than the spcified in the circuit, so could that cause misfuntionality?

etipton (author)2013-08-14

It only matters if you are trying to use a capacitor that is rated for X voltage and your system voltage is higher. Capacitance is capacitance