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

01 April 2022

Affected Parts

The following items are affected by this PCN:

  1. XEM7350-K70T
  2. XEM7350-K160T
  3. XEM7350-K160TI
  4. XEM7350-K410T
  5. XEM7350-K410T-3E

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

Revisions EXX and earlier are not affected. This includes date code 20171018 and earlier.

Revisions FXX 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 XEM7350 to generate several of the on-board system and VCCO supplies. Opal Kelly has identified suitable replacement parts for these supplies.

Description of the Change

The Enpirion devices on the XEM7350 are being replaced as described in the table below.

ReferenceVoltageApplicationOriginal P/nReplacement P/N
U1+U51.0 VFPGA VCCINT and VCCBRAMIntel EN5364QI/EN5394QIInfineon IR38063MTRPBF
U23.3 VFMC, miscellaneous system functionsIntel EN5364QIRichtek RT6278BHGQUF
U31.8 VFPGA VCCAUX, host interfaceIntel EP53F8QIMicrochip MIC23153YMT
U61.5 VDDR3Intel EP53F8QIMicrochip MIC23153YMT
U312.0 VFPGA VCCAUX_IOIntel EP5348UIMaxim MAX25300BATA/V+
U351.5VIntermediate step-down for transceiver core LDOIntel EN5337QIMPS MP2316GD-P
U361.8VIntermediate step-down for transceiver termination LDOIntel EP53F8QIMicrochip MIC23153YMT
U15VADJAdjustable supply voltage for FPGA banks 12, 15, 16Intel EN5365QISemtech SC186ULTRT¹


  1. The Semtech SC186ULTRT is capable of the same set of output voltages as the Intel EN5322QI. There is no change to VADJ configuration as described in Device Settings.