capacitor ripple vs endurance & other questions

[PCBONEZ]

Re: capacitor ripple vs endurance & other questions

.
Endurance "Lifetime" is the number of hours @ max rated temperature & @ max rated ripple [at the stated frequency] & @ max rated voltage that the cap can be subjected to - AND - still have ~all~ values within advertised specs when returned to nominal conditions.
-
In other words it's how long you can abuse the F**k out of it and cause zero damage.

The Endurance value is of no PRACTICAL use because if you never operate the cap at those conditions that number is useless information.
[ And if you -tried- to operate a mobo cap even close those conditions it wouldn't boot and some bits here and there might even melt. ]

Some people think they can calculate an expected Lifetime from it but those equations are only accurate to within +/-40%.
8 years +/-40% => 4.8 years to 11.2 years. [NOT useful information!]

.

[GameBooy2020]

Re: capacitor ripple vs endurance & other questions

I apologize, here are the values of the capacitors that I need and the sizes as well:

330 uf @ 16 V ----------- 8 x 12 mm
1000 uf @ 6.3 V ---------- 10 x 12 mm
1000 uf @ 10 V ---------- 10 x 16 mm
470 uf @ 25 V ---------- 10 x 16 mm
470 uf @ 10 V ----------- 8 x 11.5 mm
1000 uf @ 16 V ------------ 10 x 20 mm

[Toasty]

Re: capacitor ripple vs endurance & other questions

>>but rubycon doesn't make that line in the capacitance & rated voltage that I need<<

???

Give some values so we can steer you in the right direction.

>>using capacitors that I picked up at a local electronics store<<
Specifics instead of "generalities" please. What you obtained may not be correct for the unit you're fixing.

Toast

[GameBooy2020]

Re: capacitor ripple vs endurance & other questions

Hey thanks for replying!

So even though endurance is not tested in a typical operating condition, wouldn't a capacitor rated at 4000 hours @ 105C be better than a capacitor rated at 2000 hours @ 105C? I've been repairing a few monitors & video cards lately using capacitors that I picked up at a local electronics store, but I want to start using the most reliable capacitors possible for my repairs (I was planning to buy some of the mcz and mbz rubycons from here, but rubycon doesn't make that line in the capacitance & rated voltage that I need & I wanted to see if I could find something better). Basically, I just wanted to know why most people here consider the Nichicon HZ capacitors to be better than the HE ones even though they have a longer life.

[Toasty]

Re: capacitor ripple vs endurance & other questions

Depends on application is the key. Endurance is for X hours @ rated temperature @ rated ripple & voltage. That is not a typical operating condition. Typical would be < 60% of temperature and weighed across the life of the cap. The number escapes me but it is exponential in value as to the increase in lifetime for each X degree decrease from rated maximum. A 2,000 hour 105°C cap running at 60°C could easily last 10 years or more.

Impedance & ESR are essentially the same thing. Look for that instead. Again, application determines which cap is better suited.

For their particular use, I would say yes ~tentatively~. Either would work fine in the same application. CPU VRM for instance.

Again, application determines what is good vs. bad and what cap you are testing. You need the info on the original cap to determine good/bad.

Read the forums. There are ~years~ of information. Start with the FAQ's and work out from there. Not everything is a quick answer.

Cheers & Welcome!
Toast

[GameBooy2020]

Hello, I have a few questions regarding some of the specifications found on capacitor datasheets.

1.) Which specification of capacitors is more important, endurance or rated ripple? Nichicon HE capacitors have a higher endurance rating than HZ, so wouldn't they be better?

2.) Not all data sheets list esr, so how can I tell what capacitor would be better than another one?

3.) Nichicon HZ capacitors have a higher ripple rating than Rubycon MCZ capacitors, so would the nichicon HZ be better than the Rubycon in this case?

4.) Also, what range would be considered a good esr reading, and what range would be considered bad?

Thanks for taking the time to review my post!