Question......I am no expert but.....

Mar 02, 2008 5 Replies

can I replace a 4.7 uf 250 volt cap with a 4.7 uf 350 volt capacitor without doing damage or does it have to be the same voltage?forgive my ignorance but i am just getting into this...thanks


Yeah, no problem. It 'used to be', but apparently modern electrolytics don't have to be 'formed' at near their working voltage anymore.

jak

To add a little more info for the novices: the voltage rating of a capacitor is just that, a rating, not a value. The difference is that a rating is a maximum useage value. A capacitor rated at 250 volts should not be used in a circuit that will see more than 250 volts, but use in circuits with lower voltages is fine. Therefore a 350 volt capacitor can be used in place of a 250 volt capacitor without difficulty.

Good design practice calls for derating components, for instance to not use a 250 volt capacitor in any circuit that applied 125 volts to it. That would be a 50 percent voltage derating to improve the reliability of the circuit. The same principle could be applied to resistor and semiconductor power ratings, etc.

John

If it's a polarized electrolytic do be sure to observe the polarity...

Mark Z.

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