Old stockhttps://devzone.nordicsemi.com/f/nordic-q-a/31250/old-stockWe have some old stock of the nRF51822 pre 2014/8/20. Was there a change to the product around that time that would prevent us from using from using this stock? Many thanksen-USTelligent Community 13Thu, 08 Mar 2018 08:05:52 GMTRE: Old stockhttps://devzone.nordicsemi.com/thread/123355?ContentTypeID=1Thu, 08 Mar 2018 08:05:52 GMT137ad170-7792-4731-bb38-c0d22fbe4515:941874a3-3208-4475-84c1-45fd4cffed88J&#248;rgen Holmefjord<p>Hi,</p> <p>The ICs might be older revision chips. You should compare the complete packet variant and build code towards the&nbsp;<a title="nRF51822 IC revision overview" href="http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.nrf51/dita/nrf51/compatibility_matrix/nRF51822_ic_revision_overview.html?cp=3_0_1">nRF51822 IC revision overview</a>&nbsp;compatibility matrix. You can then check the chip revision towards the&nbsp;<a title="nRF51 Series IC revisions compatibility with SDK and SoftDevices" href="http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.nrf51/dita/nrf51/compatibility_matrix/nRF51422_nRF51822_ic_rev_sdk_sd_comp_matrix.html?cp=3_0_4">nRF51 Series IC revisions compatibility with SDK and SoftDevices</a>&nbsp;table.</p> <p>Best regards,<br />Jørgen</p><div style="clear:both;"></div>