https://devzone.nordicsemi.com/f/nordic-q-a/128414/nrf51822-qfab-hardware-revision-compatibilityHello, We currently use an nRF51822 device in our product with the top marking QFABC0 . We understand that NRF51822-QFAB is the ordering part number, and that QFABC0 is the top marking / hardware revision identifier on the device. Before purchasingen-USTelligent Community 13Thu, 11 Jun 2026 09:20:06 GMThttps://devzone.nordicsemi.com/thread/567748?ContentTypeID=1Thu, 11 Jun 2026 09:20:06 GMT137ad170-7792-4731-bb38-c0d22fbe4515:93d98bd6-2bc4-432e-9fd2-5e807ce22e51Hung Bui<p>Hi Yosi,&nbsp;</p> <p>You can take a look at the nRF51822 IC revisions and variants here:&nbsp;<br /><a href="https://docs.nordicsemi.com/r/bundle/comp_matrix_nrf51/page/comp/nrf51/nrf51822_ic_revision_overview.html">https://docs.nordicsemi.com/r/bundle/comp_matrix_nrf51/page/comp/nrf51/nrf51822_ic_revision_overview.html</a></p> <p>From what I can see there&nbsp;QFABC0 is on revision 3 and is the latest version. So you shouldn&#39;t have any problem with a new order of&nbsp;QFABCx0 chip. The laser marking may show for example QFABC1 but it doesn&#39;t affect the the revision of the chip. The x (in your case it was 0) is the production device identifier. It increases over time.&nbsp;</p><div style="clear:both;"></div>