over voltage for capacitor

[space2000]

hi,

i have few 4700 cap for dc power supply, but it is rated 50v. can i use it for 60volt dc? as i have seen it is over volatage. should i use it for 60 voilt or shouldn't?

thank you.

[sawreyrw]

You should use at least a 100 volt cap in a 60 volt circuit. Don't even think about using a 50 volt cap at 60 volts!

[Mooly]

Maximum ratings are what they say MAXIMUM. 50.00000001 is to high ! You need to take into account the max ripple current and maximum temperature as well. 45 Volts would be a safe working max for these caps.
Regards Karl

[Andy L. Francis]

Guys,

There are two voltage rating for an electrolytic capacitor.
First, the WV (working voltage). This determines the maximum constant voltage on the capacitor.
The other voltage rating is the maximum short-time voltage allowed on the capacitor.
An 50V(-WV) rated capacitor is OK for max. 50V constantly, and OK for ~60V for a short time.
There is no need for 100V-WV rated for a 60V PSU. You'll need a 63V-WV rated one, or 80V-WV rated one to be safe.

You need to take into account the max ripple current and maximum temperature as well.

Good point!

[jackinnj]

But old electrolytics are messier.