SFF-8611 (Straight Male) to SFF-8643 (Mini-SAS HD) Internal High-Speed Cable

🔌 Overview

• Connector A: SFF-8611 4i (38-pin, straight male)

• Connector B: SFF-8643 (36-pin Mini-SAS HD)

• Cable Type: Internal forward connection (not a breakout or reverse cable)

• Typical Lengths: 0.5m, 0.75m, 1.0m

📐 Technical Specifications

• Protocols Supported:

• PCIe Gen3 / Gen4 (8 GT/s to 16 GT/s per lane)

• SAS-3 (12 Gbps per lane)

• SAS-4 (24 Gbps per lane, depending on device compatibility)

• Lane Configuration:

• 4 lanes (x4 PCIe or 4 SAS channels)

• Impedance:

• 85 Ohms differential (PCIe/SAS standard)

• Cable Construction:

• 30 AWG or 32 AWG high-speed twinax pairs

• Individually shielded differential pairs

• Overall foil and braid shielding for EMI control

• Connector Features:

• Latching mechanism on both ends

• SFF-8611 straight plug for motherboard/HBA ports

• SFF-8643 internal Mini-SAS HD interface for backplane/expander connectivity

⚙️ Use Case

• Primary Application:

• Connecting a modern PCIe/NVMe/SAS controller with an SFF-8611 4i port

• To a legacy backplane or expander with an SFF-8643 port

• Environments:

• Enterprise servers

• Storage arrays

• Rackmount systems bridging PCIe/SAS and Mini-SAS HD platforms