Opal Kelly issues this PCN to existing customers of the listed product(s) to inform them of changes and/or updates that may affect current inventory or current and future applications of the product.

Issue Date

30 September 2022

Affected Parts

The following items are affected by this PCN:

  • XEM8320-AU25P

PCB revisions CXX and later are affected by this PCN. Revisions BXX and earlier are not affected by this change. The PCB revision is indicated in silkscreen in the location shown below.

Revisions BXX and earlier are not affected.

Revisions CXX and later are affected.

Reason for the Change

The Intel Enpirion family of power modules has been discontinued by the manufacturer. Enpirion regulators are used on the XEM8320 to generate the on-board adjustable VIO supplies. Opal Kelly has identified suitable replacement parts for these supplies.

Description of the Change

The Enpirion devices on the XEM8320 are being replaced as described in the table below.

ReferenceVoltageApplicationOriginal P/nReplacement P/N
U28VIO1Adjustable supply voltage for FPGA banks 66, 67Intel EN5311QITexas Instruments TPS65400RGZ1
U30VIO2Adjustable supply voltage for FPGA banks 84, 87Intel EN5311QITexas Instruments TPS65400RGZ1
U31VIO2Adjustable supply voltage for FPGA banks 86Intel EN5311QITexas Instruments TPS65400RGZ1


  1. The Texas Instruments TPS65400RGZ is capable of the same set of output voltages as the Intel EN5311QI. There is no change to VADJ configuration as described in Device Settings.