Murata 22 uF 16 V 1206 X7R
Murata 22 uF 16 V 1206 X5R
Both are pretty awful to me, even though the X5R capacitor is indeed worse than the X7R in this example. The working voltage and manufacturer also make a big difference, most of Murata's class-II capacitors are even worse than those of their competitors. You typically have to search the websites for characteristic curves to find data like these, the datasheets barely contain any useful information.
With ceramic class II caps it is indeed not the nicest to see but we need that low ESL. In that aspect Cornell Dubilier's FCA1210C105M-G2 is OK. Not liked by some, I don't know why. Maximum value is 1 µF 16V however. What you conclude about Murata is right, same counts for tantalum caps of various manufacturers. I recall Murata having the highest values in certain sizes but I may be wrong. I use ceramic caps because I have to and reading their datasheets is not my hobby. If everything could be done with film caps I would choose for those.
The waiting is for a 4.7 µF 16V C0G in size 0805 or 1210 🙂
The waiting is for a 4.7 µF 16V C0G in size 0805 or 1210 🙂
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But when these are used as output caps for regulators how much variation do you expect in the DC bias?
Just derate their capacitance values when DC bias is around (honestly, when isn't it?), also choose larger casings and higher voltage ratings than strictly necessary. Using caps with a better dielectric is advisable. I think my remark why I use X7R as a minimum standard holds some truth or not?!
From our friends at Murata:
https://www.murata.com/en-eu/support/faqs/capacitor/ceramiccapacitor/char/0005
From our friends at Murata:
https://www.murata.com/en-eu/support/faqs/capacitor/ceramiccapacitor/char/0005
I hope nobody is using either X5R or X7R capacitors close to their rated voltage. I typically use at least 15V rated caps for 5V output.
I also know some people who keep hearing things. My advice to them is to be silent about it.
As no-one guarantees what the capacitance-voltage characteristic looks like and as class-II capacitors also have aging effects, you can't predict very well what the capacitance is going to be, not even if you know the type number, voltage and temperature.
You don’t have to for DC decoupling though do you? If you want 0.1uF, just look at the curves for V vs C and select as appropriate taking into account th eg worst case scenario.
That’s why a local reg makes perfect sense- I had the same issue with X-Altra since both NC and MM stages had essentially zero PSRR.
Agree you should listen but I have a problem when we try to explain differences in sound with hypothesis that don’t stand to to scrutiny.
True, except that you don't really know what the worst case is when no-one guarantees anything. You can do sandbagging and hope for the best.
Not C0G but a film cap nonetheless. That is a good tip, Patrick. Thank you. Did you use these yourself?
As a (former) chess player I know what sandbagging in chess means but what does it mean in electronics?
Come on Marcel. Curves are provided. As a designer you are supposed to use your experience and size the caps accordingly.