where to find 10uf 25V to 100V C0G / NP0 ceramic capacitors?

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#5
The largest (capacitance) C0G capacitor that Mouser stocks is 1 uF/50 V.
http://www.mouser.com/ProductDetail...=sGAEpiMZZMuMW9TJLBQkXilH2oqBqzkxN7zCwvJo8Iw=

I'm surprised they even carry a C0G that large - I would have guessed an upper limit more like 0.1 uF or less. If you go to the manufacturer's technical literature I'm sure you'll see that very few even claim the ability to manufacture a 10 uF C0G.

What is your application? In terms of measurable electrical performance characteristics I suspect that a typical 10 uF film cap will equal or surpass the C0G ceramic cap.

Dale
 
#6
no one makes them that big

C0G ceramic is a "low k" dielectric - so if anyone made such a cap it would be huge

if you need "quality" in that size you probably will end up with a film dielectric like polypropylene

if you need that much C with low ESL, ESR in a tiny case you can use "hi k" ceramics - which are piezoelectric to greater extents as the k goes up - they have wild temp, V coefficients too - mostly used in PS bypass next to digital chips, some fast ADC/DAC

at lower V polymer dielectric electrolytics offer good mix of properties at 10 uF


the reason for so many cap technologies is to cover reasonable mixes of engineering function required properties economically - you really need to examine, rank your circuit requirements for the part and find the capacitor type that best fits and is available, affordable
 
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#7
For 10uF C0G you can parallel 100 off 100nF 1206. They don't come much larger than 220nF in C0G and they get more expensive above 100nF as the case sizes grow.

Why do you need C0G types? If for the Q then high voltage X7T (250V) have Q approaching 200 for audio.
 
#9
PS don't generally have that much signal on them, certainly not the output of a Vreg, any piezo generated charge sees, is shunted in the Vreg's output Z

on the input side any of abrax' supposed PS "signal induced distortion" "problems" aren't a big deal - you have the mains ripple anyway and you are using a Vreg

many circuits even in audio do have psrr - just do the numbers, make a reasoned judgment rather than run scared for "the best possible" because someone is spreading FUD
 
#10
I bought Aerovox gold 10 uf 50 v COG ceramics from newark.com 2 years ago. $4.68 apiece on closeout. Now they are non-stock, which means if you buy 1000 ea I imagine Aerovox will schedule a run for you. They were assembled in Mexico.
They sound nice in my organ and fit in the spot where those *****y short life tantalum caps came out. Audio coupler caps on 2 v signals.
21 of 22 tantalum caps I've ever owned have been defective including the new ones I bought at RL distributing (popcorn noise): I don't have much respect for them. Why install something that will need replaced again when I am age 90+? No room for film caps in this location, at least not the 63 v Roedinger ones Newark stocks. Yeah, there are *****ese assembled brand film caps available at lower voltage in a smaller package - again, why buy parts with that kind of QA program behind them. They can't even mix concrete for schools and bridges right; the romans had that technology down 2100 years ago. I was forced to buy a ******ese manufactured HDTV converter this month since there is no alternative- defective on delivery.
 
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