Nice, thanks for the link Chris-

Do you know what frequency they specify their AC Dielectric curves at? I
haven't spotted it on the data sheet yet...

On Tue, Oct 11, 2016 at 4:54 PM, Chris Andrews <chris.p.andr...@gmail.com>
wrote:

> 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
>>> -------------------------------------------------------
>>>
>>> _______________________________________________
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>>> psas-avionics@lists.psas.pdx.edu
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>>>
>>
>>
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