I guess capacitors developed for the military include a little gunpowder in the dielectric to give that extra boost to firepower?
Did google, but no ESR/Ripple result!
...still, nice to compare to other manufactures who DO print their ESR/Ripple results!
many thanks for the .pdf. Just need the ESR now.
No wonder mouser etc. don't print these Elna ripple currents, i.e. they are only half the rate of some of the panasonics, nichicons, Nippons etc.!! I imagine the ESR would be a similar story too.
Good caps = Lowest ESR/highest ripple? (but maybe the elna 'technology' makes up for this).
Yes, for PSU reservoir cap duty. However, diminishing returns soon set in. If ESR is high then lower ESR means less PSU ripple. If ESR is already low then going lower makes no difference as ripple will be set by things like wiring resistance/inductance and grounding details - which people often get wrong while their attention is diverted by worrying about component brands.thedoc735 said:
You do realize that the only thing Mouser etc. does is put online the datasheets they get from the manufacturers?
Jan
and some companies print specs that are reasonable, conservative and guaranteed while others print "typical" numbers which are not guaranteed numbers?
I saw elna Cerafine used in hi-fi audio for decoupling on digital rails while Silmic for signal coupling only on the same board(as in some marantz cd-players), the same with nichicon muse series, just coupling, never decoupling.I saw cerafine for coupling too but never saw silmic doing that job.Maybe i didn't see them all...
I think that industrial use like medical and high voltage, high frequency and high ripple smps where Siemens (epcos) and Sprague reign tells alot about that allthough Siemens is a very big if not biggest medical gear manufacturer so maybe they are just using their stuff, but Panasonic , Nichicon , Nippon Chemicon and Rubicon have zilions of low esr species and they are used too in lots of high quality smps.
Unless you checked them all i don't see ho to tell them apart.
I think that industrial use like medical and high voltage, high frequency and high ripple smps where Siemens (epcos) and Sprague reign tells alot about that allthough Siemens is a very big if not biggest medical gear manufacturer so maybe they are just using their stuff, but Panasonic , Nichicon , Nippon Chemicon and Rubicon have zilions of low esr species and they are used too in lots of high quality smps.
Unless you checked them all i don't see ho to tell them apart.
Yes, I suppose that would be the case. But the manufacturer themselves should declare/reveal all their data/specifications in the datasheets themselves.
Not bothered about brands really it is the actual facts that count. In the device I am talking about the wiring resistance/inductance and grounding details have all been upgraded too (pure silver etc). This is for a power board.
Yes, good food for thought! Glad I'm not designing circuits
so much to take into consideration!I presume it's OK to swap electrolytic caps for polymer (in the smaller values)? 😕
The purpose of a data sheet is to get people to use the stuff. There is no law about what must or must not be included.
If you read a data sheet with that in mind you can sometimes conclude as much from what is not there, as from what is there.
Jan
Using 'pure silver' makes me concerned that the person doing the 'upgrade' does not know what he is doing, unless he was merely satisfying the whims of an ignorant customer. I cannot think of any role in electronics for 'pure silver'; there is a role for silver plating at VHF and higher frequencies.thedoc735 said:
Sometimes. Sometimes not. It depends on whether the circuit relies on ESR to damp a resonance, either deliberately or accidentally. It also depends on whether the increased physical size of the film cap will create stray capacitance problems. Context matters.
- Status
- Not open for further replies.