Low ESR?

[subarub4]

So I'm looking at this 150 uF 450V cap and it's elite branded and I pulled the datasheet from here



I don't see anything about the ESR? So how do you take that? Do I replace it with say something that's a low ESR?

[mariushm]

Re: Low ESR?

ESR is not important for those large capacitors.

All will have relatively low ESR and the position in circuit where they're used makes ESR not so important.
Replace with something that has low esr, but don't stress yourself too much about it, focus on getting something that fits the space you have on the board.

[PeteS in CA]

Re: Low ESR?

Higher voltage types designed for primary side or CFL inverters usually aren't rated for impedance. Look at and match the ripple current and life ratings (along the the obvious temperature, capacity and voltage ratings and case size).

[subarub4]

Re: Low ESR?

Thanks everyone I just wanted to be sure.

[subarub4]

Re: Low ESR?

Ok you said to match the ripple current but what if say the original was 710 for the RC but the replacement was 0.79

Is that still ok?

[mariushm]

Re: Low ESR?

0.79 is 790mA, the old one is 710mA. With ripple, anything higher is better, just means the new capacitor can tolerate more than the old one.

With ESR is the other way around, lower is (usually) better.

[subarub4]

Re: Low ESR?

0.79 is 790mA, the old one is 710mA. With ripple, anything higher is better, just means the new capacitor can tolerate more than the old one.

With ESR is the other way around, lower is (usually) better.

I almost got this low ESR until I noticed the specs did not match in the listing for the heading and what Mouser put in.. it said 400V when it was 450V in the listing.

No datasheet so I just ended up getting the Panasonic again.. I think around 1 Ohm or so.

[Logistics]

Re: Low ESR?

Panasonic TS-ED

[redwire]

Re: Low ESR?

Comparing other similar snap-in capacitors (hint: Digikey and sort by ripple current) are 600mA to 1,000mA, so 790mA is reasonable. But not a figure of merit or quality:
Elite caps have some counterfeits out there. For my time and money, I buy reputable (Panasonic, Nichicon, CDE, UCC etc.) parts. This is a $3.25 cap and I'd never use the generic Chinese ones.