I finally got an LCR that can measure DC Bias and threw in the 16V, 47uF ceramics I've been using as DC-DC converter 5V output caps...
https://search.murata.co.jp/Ceramy/image/img/A01X/G101/ENG/GRM32EC81C476KE15-01.pdf
Funny that in the data sheet they give this generic "Example" plot that shows capacitance change at 5V being negligible (or even positive?).
Yeah, a lot of people misinterpret this. I forget if it's Murata or someone else, but another datasheet shows several colored curves, which one might understand as including the linked part in question. Nevermind that in both cases, you're looking at the
family datasheet, mostly dull junk about packaging, specifications and methods, quality and so on.
This one at least is specific that it's the "Sample: X7R(R7) Characteristics 0.1μF, Rated Voltage 50VDC" part, clearly not just anything in the family.
It would probably be better if they didn't have a curve at all and just had verbiage to the effect of "characteristics vary with temperature and voltage; consult the characteristics database at xxx for more information" -- or, you know, they actually generated the fucking datasheets per-part with curves. They can, Samsung does (sometimes..), but most still do not.
[1]: Idk if they all got one. I'm only familiar with those from KEMET, Samsung, Murata and TDK.
I would consider AVX pretty big. Venkel perhaps as well. Neither offers characteristics on anything last I checked. Their loss; I've no problem buying their film caps or whatever, but type 2 ceramics are a strict no-no for me.
Tim