https://devzone.nordicsemi.com/f/nordic-q-a/127774/32khz-crystal-and-ultrasonic-weldingUltrasonic welding is commonly used to seal plastic enclosures for electronic devices. 32kHz crystals can be damaged by this type of welding and manufacturers recommend not to use ultrasonic welding. Since we use a 32kHz crystal for precise timing onen-USTelligent Community 13Wed, 15 Apr 2026 12:35:32 GMThttps://devzone.nordicsemi.com/thread/564987?ContentTypeID=1Wed, 15 Apr 2026 12:35:32 GMT137ad170-7792-4731-bb38-c0d22fbe4515:45c9121d-9b2e-4b89-a380-f757ad5fbc74Hung Bui<p>Hi Alberto,&nbsp;</p> <p>I agree with Nguyen on that you should look for the option with Mems oscillator. Our nRF52 does support BYPASS mode to use with&nbsp;rail-to-rail external source.</p> <p><br />Another option is to find anti-ultrasonic crystal but I don&#39;t think it&#39;s very popular.&nbsp;</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/564951?ContentTypeID=1Wed, 15 Apr 2026 03:13:59 GMT137ad170-7792-4731-bb38-c0d22fbe4515:f58af955-e4b1-46e2-8909-76c0d3157e1aNguyen Hoan Hoang<p>It is recommended to use mems oscillator for that type of assembly. Not sure however if Nordic nRF52 supports oscillator instead of crystal.&nbsp;</p><div style="clear:both;"></div>