SlimSAS SFF-8654 Internal High-Speed Cable

📐 Overview

• Connector Type: SFF-8654

• Form Factor: SlimSAS (Compact 0.6 mm pitch)

• Pin Count

• SFF-8654 4i: 38 pins (4 lanes)

• SFF-8654 8i: 74 pins (8 lanes)

🚀 Electrical & Signal Specs

• Protocol Support:

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

• SAS-3 (12 Gbps) / SAS-4 (24 Gbps)

• NVMe over PCIe

• Lane Support:

• 4i version: x4 PCIe / 4 SAS lanes

• 8i version: x8 PCIe / 8 SAS lanes (can be split into 2x 4i)

• Impedance: 85 Ohms differential

• Wire Gauge: Typically 30 AWG to 32 AWG

• Shielding:

• Individually shielded differential pairs

• Overall foil + braid shielding for EMI suppression

📏 Cable Lengths

• Common lengths:

• 0.25 m, 0.5 m, 0.75 m, 1.0 m

• Note: PCIe Gen4+ signal integrity limits practical length to ~0.75 m max

⚙️ Use Case

• Internal high-speed interconnect between:

• RAID/HBA cards to backplanes

• CPU boards to U.2/U.3/NVMe drives

• Midplane to daughterboard inside servers

• Found in:

• 1U/2U enterprise servers

• Storage enclosures

• NVMe RAID arrays

• PCIe expansion architectures