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Green PCB adapter with gold SFF-8639 connector and PCIe edge fingers

Innocard

Innocard EDSFF Gender Changer PCIe 4.0 x4 Hot Plug SFF-8639

SKU CH-91WM-8BBYW

Converts SFF-8639 to PCIe 4.0 x4 with hot-plug power management and BMC support

  • Changer TypeEDSFF
  • Converts SFF-8639 to PCI Express 4.0 x4
  • Built-in clock buffer drives longer traces and cables
  • SMBus switch and I/O expander enable remote management
  • Hot-plug 12 V power with eFuse and 400 W TVS protection
  • Industrial temperature range with BMC management support

EDSFF Gender Changer for PCIe 4.0 x4

This Innocard adapter converts an SFF-8639 connector to a PCI Express 4.0 x4 interface. It is designed for server and industrial environments that require hot-plug capability and BMC management support. The unit operates across an industrial-grade temperature range. It targets system integrators building EDSFF storage infrastructure.

Sustained-load behaviour with hot-plug protection

The board integrates a 12 V hot-plug power circuit with eFuse protection and a programmable current limit of 6.5 A. Thermal shutdown and fault alert functions protect the hardware during continuous operation. Bidirectional voltage-level translators on WAKE# and CLKREQ# maintain signal integrity over longer trace lengths and cables. A 100 MHz clock buffer drives extended traces without degradation.

SFF-8639 to PCIe 4.0 x4 conversion

The adapter provides a direct SFF-8639 to PCIe 4.0 x4 gender change using a 30u” connector. An onboard SMBus switch at address 0x71 and an I/O expander at 0x41 enable Gen-Z 1C power disable control. PCIe PERST# supports out-of-band management for remote reset. A 400 W TVS diode protects the 12 V input from transient voltage events.

Highlights

  • Converts SFF-8639 to PCI Express 4.0 x4
  • Built-in clock buffer drives longer traces and cables
  • SMBus switch and I/O expander enable remote management
  • Hot-plug 12 V power with eFuse and 400 W TVS protection
  • Industrial temperature range with BMC management support

Specifications

Changer TypeEDSFF

Questions about this item

How much heat and power does the built-in 12 V hot-plug eFuse draw when the adapter runs continuously?

The eFuse is programmable to a 6.5 A current limit with adjustable inrush slew rate, includes thermal shutdown protection and a 400 W TVS for transient suppression.

What host-side slot and cabling must already be present for this EDSFF gender changer to function?

A PCI Express 4.0 x4 slot is required; the on-board 100 MHz clock buffer and SMBus switch allow longer traces or cables without additional active components.

Will the SFF-8639 connector and PERST#/WAKE# translators work with older Gen-Z 1C or PCIe 3.0 drives I keep in service?

Yes — the bidirectional voltage-level translators on PERST#, WAKE# and CLKREQ# support open-drain signalling over extended cables, enabling out-of-band management with legacy Gen-Z 1C devices.

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