Murata has all of their passive component data on their website: http://ds.murata.co.jp/software/simsurfing/en-us/index.html
This includes: S parameter files (which show self resonant frequency) Capacitance derating as a function of voltage (for capacitors) I've found this to be a great resource. -Chris On Tue, Oct 11, 2016 at 1:45 PM, Doug Ausmus <daus...@gmail.com> wrote: > I didn't see anyone bring this up, and I'm not sure which dielectrics and > types are being used, and at risk of stating what is likely trivially > obvious to the electronics designers in this august group <g>, but when > using MLCC and going to smaller size capacitors (X5R and X7R, others) don't > forget to re-check the dielectric voltage-dependence curves. For your chip > film caps, this is far less an issue. > > Here is some info and references, just in case some of your > non-electronics designers want to check it out: > > Although this article is testing with higher valued caps, here's a nice > graph showing how the smaller chip sizes increase this effect over larger > sizes: > http://www.edn.com/design/analog/4402049/2/Temperature- > and-voltage-variation-of-ceramic-capacitors--or-why- > your-4-7--F-capacitor-becomes-a-0-33--F-capacitor > (Figure 1 and Table 2) > (From the following original article:) > https://www.maximintegrated.com/en/app-notes/index.mvp/id/5527 > > Most everyone is aware of the DC bias dielectric effects, but note that AC > waveforms have some dielectric effects as well, but exert their effects in > the opposite direction, to a point and are, of course, frequency dependent > (I am not sure if these AC dielectric effects are also size-dependent or > not, but it would be logical they might be): > http://catalogs.avx.com/SurfaceMount.pdf > (PDF page 128, [doc page #127]... Figures 2, 3) > > :-) > Doug > > > > On Sun, Oct 9, 2016 at 11:18 PM, Andrew Greenberg <a...@ece.pdx.edu> wrote: > >> > Are there any places where we need to be concerned about wattage? >> >> Yep! There are two cases that we won't switch packages: one where >> wattage is a problem (so far, no cases of this on the LGR board) and one >> where the capacitance value is too high for an 0402 (anything greater >> than about 1 uF). In these (and other cases I'm sure I missed) we'll >> leave the larger packages. Other than that, the "jelly bean" parts can >> be switched to 0402. >> >> OK, everyone seems to agree it's a "go", so now OreSat's default package >> size is now 0402. I think this makes sense. >> >> Andrew >> >> -- >> ------------------------------------------------------- >> Andrew Greenberg >> >> Electrical and Computer Engineering >> Portland State University >> http://www.ece.pdx.edu/ >> a...@ece.pdx.edu C: 503.708.7711 >> ------------------------------------------------------- >> >> _______________________________________________ >> psas-avionics mailing list >> psas-avionics@lists.psas.pdx.edu >> http://lists.psas.pdx.edu/mailman/listinfo/psas-avionics >> > > > _______________________________________________ > psas-avionics mailing list > psas-avionics@lists.psas.pdx.edu > http://lists.psas.pdx.edu/mailman/listinfo/psas-avionics > >
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