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SM320C6678-HIREL: decap recommendation

Part Number: SM320C6678-HIREL

Hi I am using SM320C6678-HIREL in my board. as per recommendation i should use 560pF decaps on power rail, but I am not getting automotive grade part of 560pF in 0201 package. If i use combination of 470 and 680 to effectively become 560pF, will it create any issue. Also I am not using all 8 cores effectively only 6 cores are used.

  • Ajay,

    You do not want to put capacitors in series as that adds inductance.  If you are saying that you will use a mixture of 470pF and 680pF decoupling capacitors distributed on the power plane to replace the recommended 560pF capacitors, that is reasonable.  Keeping the package size small is most important to minimize package and trace inductance.

    Tom