Where can I buy a capacitor smg 120uF 200V?

[antares]

Sorry if this is a stupid question but it seems this capacitor is hard to find and all the sites I found that have them sell only in big quantities (200 pcs. and up).

Thanks

[undamned]

Expand your search to encompass higher voltage ratings. This will not effect the compatibility of the capacitor, it just means it can handle higher voltages than your are actually going to expose it to. I just found 3 pages of single qty. ~$3 caps on Digikey by searching all 120uF aluminum caps at voltages above 200V (i.e. 250, 350, 400, ...). Only concern after that is physical size. Higher voltage means it will be bigger, so as long as it will still fit into what you are working on, you should be fine
-ud

[Ex-Cyber]

Expand your search to encompass higher voltage ratings. This will not effect the compatibility of the capacitor, it just means it can handle higher voltages than your are actually going to expose it to.

IIRC you don't want to go too high because the dielectric on electrolytic caps can actually get screwed up over time from insufficient voltage (yes, I know that sounds bizarre, but it's a chemical thing). Still, replacing a 200V with a 250V shouldn't be a problem.

[antares]

Thanks for the help. I wasn't sure if I can go up in voltage.

[viletim]

IIRC you don't want to go too high because the dielectric on electrolytic caps can actually get screwed up over time from insufficient voltage (yes, I know that sounds bizarre, but it's a chemical thing).

Not true. Actually, running a capacitor at significantly lower than its rated voltage will extend its working life (all other things being equal).

[Ex-Cyber]

IIRC you don't want to go too high because the dielectric on electrolytic caps can actually get screwed up over time from insufficient voltage (yes, I know that sounds bizarre, but it's a chemical thing).

Not true. Actually, running a capacitor at significantly lower than its rated voltage will extend its working life (all other things being equal).

Not if the voltage is too low to maintain the dielectric (talking about electrolytic caps here, not ceramic etc.). It's generally recognized and documented that this tends to be the case when zero voltage is applied (see e.g. section 2-6 of this document), but I'm not sure what the exact relationship is between the rated voltage and the minimum operating voltage.