QSFP28 Passive DAC Cable

Volex’s QSFP28 passive direct attach copper cable features 4 transmitting and 4 receiving channels at 25 Gbps per channel speed. Each assembly meets 100G Ethernet and InfiniBand Enhanced Data Rate (EDR) specifications and is designed for high density applications, where high performance and bandwidth interconnect solutions are required.

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 QSFP28 100G/EDR cable assemblies are designed to meet the next-gen data centre needs. The Volex QSFP28 100G/EDR cable pluggable module is compatible with QSFP-DD, QSFP56 and QSFP28 ports for ease of data centre upgrade.

QSFP28 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

QSFP28 Passive DAC Cable Features and Specifications

Product Type QSFP28 to QSFP28 passive direct attach copper cable
Conductor Treatment Laser stripped conductors
Cable Type High-speed twinax cable, 8-pair differential, 100 +/-5 ohms
Cable Colour Black
Cable Jacket PVC
Packaging PE bag
Power Supply Voltage 3.3V
Temperature Range 0 – 70o C
Retention Force Maximum 125N per SFF-8661
Minimum 60N per SFF-8661
Insertion Force Maximum 60N per SFF-8661
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.

QSFP28 Passive DAC Cable Applications

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

Standards Compliance of QSFP28 Passive DAC Cable

  • IEEE P802.3bj, IEEE 802.3by
  • InfiniBand EDR
  • SFF-8665, SFF-8661, SFF-8679, SFF-8636
  • EIA-364
  • UL 94, 1581, VW1, File No. E510564
  • RoHS

QSFP28 Passive DAC Cable Mechanical Drawings

QSFP28 Passive DAC Cable Product Dimensions

Volex P/N

Cable Length
Cable Gauge

Cable OD


0.50 30 7.0


1.00 30 7.0


1.50 30


DA40PSG20BL 2.00 30



2.50 30 7.0


3.00 30


DA48PSG35BL 3.50 28



4.00 28 8.5
DA46PSG45BL 4.50 26



5.00 26


0.5-5m 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 QSFP28 Passive DAC Cable

Contact Volex for further assistance with external QSFP28 passive direct attach copper cable.