ISI / Molex PCIe XMC x8 Lane Adapter

ISI / Molex PCIe XMC x8 Lane Adapter allows a single-width XMC module to be used in a PCI Express slot. The XMC module is compatible with VITA 42.3 and supports up to eight PCI Express lanes. This adapter is completely transparent to PCI Express. All signals from the PCI Express host bus are connected directly to the XMC module. The XMC P16 connector is routed to SATA connectors for signals at speeds up to 3GHz. The connectors provide a simple way to patch-panel communications links between cards. The XMC Jn4 connector routes differential matched-length pairs to the MDR68 connector at the back of the card. The SMA connectors provide special support for trigger and timing inputs to innovative XMC modules.

More power to the XMC module may be provided by using an optional power connector to the adapter card. The power connector delivers +12V to the adapter and powers the on-card 3.3V, 15A DC-DC power supply. Power to the XMC VPWR inputs is configurable using jumpers on the card. ISI / Molex PCIe XMC x8 Lane Adapter mounts to the adapter using standoffs and with the end-bracket. The bracket mates to standard PMC end brackets and supports an EMI gasket.


  • Adapt one XMC PCI Express VITA 42.3 module to a desktop PCI Express slot
  • Supports up to 8 lanes
  • Transparent operation
  • 8 high-speed expansion ports from XMC J16 using SATA connectors
  • 32 differential pairs routed from Pn4 to rear MDR68
  • IEEE 1384 XMC mechanicals
  • >50W power provided to the module
  • Auxiliary power connector for 12V
  • Configurable XMC VPWR connections
  • Robust end-bracket
  • Optional fan provides 12CFM airflow
  • Thermal plane and conductive rails improve module cooling
  • Approximately half the size of PCI Express card


  • Add XMC modules to standard PCIe host systems
  • System expansion using high-speed serial links

Block Diagram

ISI / Molex PCIe XMC x8 Lane Adapter
Published: 2021-12-10 | Updated: 2022-03-23