https://devzone.nordicsemi.com/f/nordic-q-a/122296/nrf52840-dying-after-a-while-because-vddh-not-connnected-to-vddHi, With several nrf52840 based prototypes, I had serious problems. I could see them die after flasing them a few times. And this was not just one dying, it was all of them, and never the first time. Sometimes after a few weeks. After investigationen-USTelligent Community 13Tue, 17 Jun 2025 07:24:24 GMThttps://devzone.nordicsemi.com/thread/539477?ContentTypeID=1Tue, 17 Jun 2025 07:24:24 GMT137ad170-7792-4731-bb38-c0d22fbe4515:9bc74100-de07-4cd2-b162-502c228ce7a3Menon<p>Hello,</p> <p>Tying VDDH to VDD (or supplying VDDH properly) is essential for maintaining internal regulator stability. If left floating, the chip can degrade gradually. See some of the old DevZone tickets discussing similar topics.</p> <p><a href="https://devzone.nordicsemi.com/support-private/support/224486">&nbsp;https://devzone.nordicsemi.com/support-private/support/224486</a><br /><br /></p> <p><a href="https://devzone.nordicsemi.com/support-private/support/275223">https://devzone.nordicsemi.com/support-private/support/275223</a></p> <p>Kind Regards,</p> <p>Abhijith</p><div style="clear:both;"></div>