https://devzone.nordicsemi.com/f/nordic-q-a/80755/themal-resistance-nrf52840-wlcspHi, Could you provide us with the thermal resistance of the nRF52840 WLCSP? We need it for the thermal analysis. Thanks, Shimadaen-USTelligent Community 13Tue, 19 Oct 2021 00:27:51 GMThttps://devzone.nordicsemi.com/thread/334703?ContentTypeID=1Tue, 19 Oct 2021 00:27:51 GMT137ad170-7792-4731-bb38-c0d22fbe4515:c8504aca-17d4-4c15-ba1f-0bbedf08b124Taiyo shimada<p>Dear Mr.Johansen</p> <p></p> <p>Thank you for your answer.<br />I am grateful for your speedy handling.<br />With your response, my problem was solved.</p> <p></p> <p>Thanks,</p> <p>Shimada</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/334648?ContentTypeID=1Mon, 18 Oct 2021 13:54:37 GMT137ad170-7792-4731-bb38-c0d22fbe4515:f265708e-615f-4035-88bb-25f20981a544ketiljo<p>Dear Mr. Shimada</p> <p>Junction to ambient thermal resistance for a a typical QFN package is 40-50 <span>°C/W. The CSP package will have a higher value, maybe as much as 100&nbsp;°<span style="background-color:rgba(255, 255, 0, 1);font-weight:bolder;">C/W</span> depending on the size of the ground plane, vias etc. Most of the heat dissipation&nbsp;will take place via the ground balls and the ground plane.&nbsp;</span></p> <p><span></span></p> <p><span>best regards,</span></p> <p><span>Ketil Aas-Johansen</span></p><div style="clear:both;"></div>