https://devzone.nordicsemi.com/f/nordic-q-a/725/crystal-selectionHi, In the reference design of &quot;nRF51822-QFAA_ST_BAL-NRF01D3&quot;, the datasheet recommends this crystal ( www.digikey.com/.../3125558) , but we are out of stock from local distributors now. So we plan to use this one instead ( www.digikey.com/.../1468354en-USTelligent Community 13Wed, 04 Jun 2014 08:50:30 GMThttps://devzone.nordicsemi.com/thread/3703?ContentTypeID=1Wed, 04 Jun 2014 08:50:30 GMT137ad170-7792-4731-bb38-c0d22fbe4515:97a4f6c1-8d75-44d0-8cb3-c31af3faf321Poh Chin Soon<p>Hi,</p> <p>Well, we try using 12pF load cap crystal on nRF51822, it gets disconnected right after connect on master control panel. Replace with 8pF load cap crystal. Works fine after that.</p> <p>It seems the start up of the crystal is very critical?</p> <p>Thanks, Poh</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/3702?ContentTypeID=1Fri, 25 Oct 2013 16:55:58 GMT137ad170-7792-4731-bb38-c0d22fbe4515:d48f3d40-378f-41e5-8419-b5a871abb777Fenglong<p>Thanks Håkon.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/3701?ContentTypeID=1Thu, 24 Oct 2013 07:35:23 GMT137ad170-7792-4731-bb38-c0d22fbe4515:80a385ce-4b0b-47f3-8fef-a29ed0b29dd1H&#229;kon Alseth<p>Hi,</p> <p>Those two crystals are fairly equal (same manufacturer and series). As long as you keep under +/- 40 ppm overall drift for BLE applications and +/- 60 ppm for proprietary applications, you should be OK. Other electrical specs are also within the specs for the nRF-device.</p> <p>There should not be a problem using this xtal.</p> <p>Best regards Håkon</p><div style="clear:both;"></div>