https://devzone.nordicsemi.com/f/nordic-q-a/80533/decouplingI&#39;m designing around part 1490-1071-2-ND (nRF52840-QIAA) Your ref designs show DEC5 decoupled with C9, 820pfF and states &quot;not required for Fxx &amp; later&quot; Do I need to place a component here?en-USTelligent Community 13Tue, 12 Oct 2021 11:24:15 GMThttps://devzone.nordicsemi.com/thread/333716?ContentTypeID=1Tue, 12 Oct 2021 11:24:15 GMT137ad170-7792-4731-bb38-c0d22fbe4515:94cfc1b3-9d2e-4633-a75d-51e42b9c6e95JONATHAN LL<p>Hi,<br /><br />The&nbsp;<span>&quot;not required for Fxx &amp; later&quot; refers to the fact that in the newer&nbsp;revisions(<a href="https://infocenter.nordicsemi.com/topic/ps_nrf52840/ordering_info.html?cp=4_0_0_9_2#order_codes">build code</a>)&nbsp;of the SoC the external decupling of DEC5 is not needed. So the 820pF is not longer&nbsp;necessary and can be excluded. However it does not do any harm to have it there either.&nbsp;<br /><br />But if the SoC <strong>does not</strong> have a build code Fxx or later then C9@820pF it is need.&nbsp;<br /><br /><br />If you don&#39;t know then include the DEC5 decupling capacitor&nbsp;in the layout and if at any later stage you find out it is not needed then you can remove it from the BOM and leave it NC/DNF.<br /><br />Regards,<br />Jonathan</span></p><div style="clear:both;"></div>