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Replacing capacitors with different rating? Answered


Hi! I am trying to repair a computer monitor....it has 2 capacitors that are blown. I have a replacement for the first one, but not for the second one.... My question: On the capacitor it says 330μF 25V, can I replace it with another type of capacitor? Wich number is important, the "μF" or the "V"?

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1
thelandofthedave
thelandofthedave

Best Answer 8 years ago

They are both important. The 330uF you should stick to the same value. But the 25V is the voltage rating that the cap can handle. You can use one with a higher V rating but not one with a lower V rating. So a 330uF 50V will suffice. But a 330uF 10V will be a problem. The uF is the capacitance of the capacitor and was chosen by the designer for a particular reason. The circuit may not operate correctly with a different value of capacitor. The Voltage rating is the voltage the capacitor can handle.

0
Fypsigon
Fypsigon

Answer 8 years ago

Thank You very much for the answer!!

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Josemech
Josemech

4 months ago

Can I safely replace a 100uf 50v with a 100uf 100v

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Tachyon
Tachyon

Reply 4 months ago

Absolutely.
As was so nicely explained above, the voltage rating is simply the maximum voltage the capacitor can safely handle.

Think of it like buying 150km/h speed rated tires to drive on 100km/h speed limit roads. The tires don't care if you're only driving at 100km/h or 10km/h, they'll still work fine and you'll have a large margin of safety.

So why not just use a bunch of 300v capacitors for everything in a household electronics item and save all the hassle?

A) money. In general a 20v 5uf will cost less than a 300v 20uf capacitor so if your circuit is say 12v then it saves money to use the lower rated capacitors.
B) size/space. The lower voltage rated parts after often smaller at the same capacitance (uf) rating and of course these days manufacturers are trying to keep things as small as possible.
In your case this may also affect whether the replacement fits or not in the same space as the original.

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Jimmy_da_Creek
Jimmy_da_Creek

4 months ago

To Josemech

Yes! Nice explanation of capacitor values by "theland of the dave" in this thread