[SI-LIST] Re: Bypass Capacitor Selection

Please look into broadside caps as well (with the wider side having the
electrical contacts ). There are some "BGA" style caps too


.



SI List wrote:

> Dear All,
>
> After studying many books, the bottom line for high frequency bypass
> capacitor selection seems to be the following:
>
> Use the smallest possible package and then take the largest valued
> capacitor available in that package.
>
> Although 0201 capacitors are available, they are kind of hard to
> assemble. So in our design, we are thinking of using 0402 X5R parts.
>
> In a 0402 package, the largest value available seems to be 1 uF.
>
> My frequency range of interest is DC to 500 MHz. In addition to the
> bypass capacitors, I know that there must be a pair of closely spaced
> VCC/GND reference planes.
>
> My questions:
> 1. Does it make sense to only use 1 uF 0402 capacitors for bypassing?
> Other people often use a combination of 1 nF/10nF/100nF. 2. I have been
> looking at the frequency characteristic of 100 nF 0402 X5R capacitors
> given in the data sheets of different manufacturers. The impedance vs.
> frequency plot often looks quite different from manufacturer to
> manufacturer. Should I choose the manufacturer with the best frequency
> characteristic or are all such parts almost equivalent? 3. Does it make
> sense to use surface mount capacitor arrays for bypassing?
>
> Thanks for all your expert feedback.
>
> Best regards,
>   Martin Heimlicher, heimlicher__at__enclustra//dot//com
>
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