https://devzone.nordicsemi.com/f/nordic-q-a/4075/nrf51422-thermal-characteristicsWhere can I find theta JC (junction to case) and theta CA (case to ambient) or equivalent thermal characteristics for the nRF51422 in WLCSP package? I&#39;ve looked in the data sheet, series reference manual, forum articles and in other downloads from theen-USTelligent Community 13Fri, 17 Oct 2014 12:13:51 GMThttps://devzone.nordicsemi.com/thread/14621?ContentTypeID=1Fri, 17 Oct 2014 12:13:51 GMT137ad170-7792-4731-bb38-c0d22fbe4515:43e0f7d0-158f-4639-829f-be31a044a033Asbj&#248;rn<p>It should be fine as long as you don&#39;t have to strict requirements for the measurements. I would also recommend you to do a simple calibration of your temperature. We&#39;ve seen that implementation might change the offset slightly, so test the temperature sensor on your board at a fairly known temperature and check the difference.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/14620?ContentTypeID=1Wed, 15 Oct 2014 16:09:54 GMT137ad170-7792-4731-bb38-c0d22fbe4515:68905672-0868-4917-8e1f-1f7433325ef0Matt Barr<p>Thanks for the answer, understood. I am definitely not planning to add a heat sink. :-)</p> <p>I want to use the die temp measurement as a poor-man&#39;s ambient temperature sensor, I have a good idea what my average power consumption is and was looking for known-to-be-correct thermal resistance numbers. I can empirically determine a reasonable junction-to-ambient value based on temperature measurements and average power, this should be plenty good enough for what I am trying to do.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/14619?ContentTypeID=1Wed, 15 Oct 2014 14:16:44 GMT137ad170-7792-4731-bb38-c0d22fbe4515:a1e357ca-4506-47fa-ace7-66cfd2cad6e3Asbj&#248;rn<p>Due to their intrinsic low power nature, thermal resistance is generally not a major consideration for Nordic Semiconductor products.</p><div style="clear:both;"></div>