QSFP-DD Passive DAC Cable

Volex’s QSFP-DD (Double Density) passive Direct Attach Copper cable doubles the number of lanes of the previous 100/200Gbps generation QSFP28/56 from 4 to 8. The cable assembly supports 200Gbps with 25Gbps/lane NRZ modulation and 400Gbps with 50Gbps/lane PAM-4 modulation for a reach up to 3m.

As next-gen data centres deploy faster speed in a tighter space, they need high performance cables that reduce power consumption, provide reliable operation and are low cost. Volex’s QSFP-DD cable is designed to meet the next-gen data centre needs. With unique foam dielectric construction, Volex QSFP-DD cable offers the smallest cable outer diameter and bend radius and highest flexibility while meeting or exceeding the MSA signal integrity specification.

QSFP-DD Passive DAC Cable Product Highlights

  • Near zero power consumption and no heat generated
  • Complete cable assembly uniquely terminated at the factory to provide the most reliable operation
  • 100% tested for signal integrity with serial number traceability

QSFP-DD Passive DAC Cable Features and Specifications

Product Type QSFP-DD to QSFP-DD passive direct attach copper cable
Conductor Treatment Laser stripped conductors
Cable Type High-speed twinax cable, 16-pair differential, 100 +/-5 ohms
Cable Colour Black
Cable Outer Layer Plastic braided mesh
Packaging PE bag
Power Supply Voltage 3.3V
Temperature Range 0 – 70o C
Retention Force Minimum 125N per MSA specification
Insertion Force Maximum 90N per MSA specification
EEPROM Each connector module contains an EEPROM to provide product information to the host system
Cable Termination 100% factory tested including comprehensive signal integrity verification and serial number traceability using advanced Manufacturing Execution Systems
Volex reserves the right to change specifications and availability without prior notice.

QSFP-DD Passive DAC Cable Applications

  • Switches, Servers, Routers, Storage Arrays
  • Networking Equipment
  • Data Centres
  • Storage Area Networks
  • Telecom Central Offices (CO)
  • Test and Measurement Equipment

Standards Compliance of QSFP-DD Passive DAC Cable

  • IEEE P802.3cd
  • QSFP-DD Hardware Specification
  • EIA-364
  • UL 94, 1581, VW1, File No. E510564
  • RoHS

QSFP-DD Passive DAC Cable Mechanical Drawings

QSFP-DD Passive DAC Cable Drawing

QSFP-DD Passive DAC Cable Product Dimensions

Volex P/N

Cable Length
Cable Gauge

Cable OD


0.50 30 9.0
DQ50BDG10BS 1.00 30



1.50 30 9.0


2.00 28 10.4
DQ58BDG25BS 2.50 28


DQ56BDG30BS 3.00 26


0.5-3m lengths available with 26-30 AWG conductor sizes to achieve maximum performance. Options Available:

  • Low Smoke, Zero Halogen (LSZH) jackets
  • Custom colours for pull tab
  • Custom EEPROM mapping

Contact Volex for QSFP-DD Passive DAC Cable

Contact Volex for further assistance with external QSFP-DD passive direct attach copper cable.