SFF-8654 to SFF-8654 Internal SlimSAS High-Speed Cable

🔌 Overview

• Connector A: SFF-8654 (4i or 8i)

• Connector B: SFF-8654 (4i or 8i)

• Cable Type: Internal high-speed direct interconnect

• Orientation: Straight-to-straight or Straight-to-right-angle options

• Lengths: 0.25 m to 1.0 m (typical)

📐 Connector Specs

• SFF-8654 4i:

• 38-pin

• 4 differential pairs (x4 PCIe or 4 SAS channels)

• SFF-8654 8i:

• 74-pin

• 8 differential pairs (x8 PCIe or 8 SAS channels)

• Often used for dual 4-lane applications

• Pitch: 0.6 mm (SlimSAS form factor)

🚀 Electrical and Signal Performance

• Supported Protocols:

• PCIe Gen3 / Gen4 / Gen5 (8 GT/s to 32 GT/s per lane)

• SAS-3 (12 Gbps) / SAS-4 (24 Gbps)

• NVMe over PCIe (U.2/U.3 and custom midplane connections)

• Impedance: 85 Ohms differential

• Wire Gauge: 30 AWG or 32 AWG (twinaxial high-speed)

• Shielding:

• Individually shielded twisted pairs

• Full outer foil/braid shielding for EMI mitigation

⚙️ Use Cases

• High-Speed Internal Interconnect:

• Between two SlimSAS-enabled components (e.g., RAID controller to backplane, CPU board to midplane)

• Also used for inter-board PCIe/NVMe communication in blade or modular servers

• Enterprise Applications:

• Rackmount servers (1U–2U)

• Storage enclosures

• Custom server builds with SlimSAS-native backplanes or adapters

🧠 Notes

• Lane mapping must match: Ensure that both ends (4i or 8i) are designed for the same protocol and directionality.

• Not a breakout cable: This is a point-to-point cable, not designed to convert to SATA or other connectors.