https://devzone.nordicsemi.com/f/nordic-q-a/24286/nordic-nrf52840-thermal-characteristicsHi Nordic, I’m H/W engineer, dedicated in development of radio circuit. I ask the question because we’d like propose your Nordice nRF52840 to our customer when replying the request of a BLE radio. So far we check the solution with the capability, muchen-USTelligent Community 13Mon, 14 Aug 2017 14:38:38 GMThttps://devzone.nordicsemi.com/thread/95591?ContentTypeID=1Mon, 14 Aug 2017 14:38:38 GMT137ad170-7792-4731-bb38-c0d22fbe4515:d67dd490-a2ab-476b-86ff-a8a598a31146Engineer<p>It&#39;s a great reference for the earlier nRF51 series. Thanks.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/95593?ContentTypeID=1Mon, 14 Aug 2017 14:37:01 GMT137ad170-7792-4731-bb38-c0d22fbe4515:b658be7d-7da0-4d09-a93e-a28120082142Engineer<p>Thanks. It&#39;s a great comment. I shoud not concern too much when running thermal simulation if I target on the temperature of PCB less than 85C.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/95592?ContentTypeID=1Fri, 11 Aug 2017 14:27:53 GMT137ad170-7792-4731-bb38-c0d22fbe4515:31d4a5e9-bf22-4286-963b-335b6fb529e5Turbo J<p>Theta j-a <strong>highly</strong> depends on your board layout, and if it is 2, 4 or more layers.</p> <p>I did not find anything for the AQFN73 package, but figures for regular QFN 7x7mm are in the <code>33-50°C/W</code> range for Theta j-a.</p> <p>But just looking at the current consumtion figures reval this as a non-issue. I strugge to get anything above 25mA consumtion for the entire chip, which yields less than 0.1W heat - or about 5 degress celsius over ambient.</p> <p>Unless you do something crazy like shorting many output pins, the genereated heat will not be a problem.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/95590?ContentTypeID=1Fri, 11 Aug 2017 14:24:31 GMT137ad170-7792-4731-bb38-c0d22fbe4515:b07a35ac-763a-4847-9967-45734803c7e0AmbystomaLabs<p>I have never seen Nordic provide theta JC, JA, etc. data for the nRF products. They draw such low current that the junction temp rise relative to ambient will be rather small under any condition. You should be able to just follow their ambient temp guidelines in the product spec and not be concerned with the junction temp.</p> <p>However, if you wish to be more thorough you can easily write some custom code to exercise the nRF per your products requirements and just measure the core temp using built in temp sensor and that will give you theta J-A.</p> <p>See this answer where Nordic discusses this solution: <a href="https://devzone.nordicsemi.com/question/49796/nrf51822-thermal-parameters-demand/">devzone.nordicsemi.com/.../</a></p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/95588?ContentTypeID=1Fri, 11 Aug 2017 14:10:36 GMT137ad170-7792-4731-bb38-c0d22fbe4515:3e39ec12-29cf-493e-a337-b0a7e6aeaec7Engineer<p>Hi all, to recap my points, I need thermal information such like (1) maximum junction temperature (2) thermal resistance, Theta j-c, Theta j-b and Theta j-a to run thermal simulation for an AP. Could anyone help? Thanks</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/95589?ContentTypeID=1Fri, 11 Aug 2017 13:52:38 GMT137ad170-7792-4731-bb38-c0d22fbe4515:4bbd3915-6f2b-4e03-ae62-8845ab0242f2Turbo J<p>Please reformat your question. It is almost unreadable.</p><div style="clear:both;"></div>