We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Blue 0.5 m QSFP28 passive copper DAC cable with pull tabs

Wiitek

Wiitek 100GbE QSFP28 DAC Twinax Cable 0.5 m network ethernet cable

SKU CH-5MEY-W9F7F

A 0.5 m passive copper cable establishing a 100GbE link between QSFP28 ports on compatible switches and routers

  • Length0.5 m
  • 100 GbE throughput with QSFP28 direct attach
  • Passive copper design draws minimal power and EMI
  • 5 m length fits tight intra-rack connections
  • Broad compatibility with Cisco, Ubiquiti, MikroTik and more
  • IEEE 802.3 and SFF-8665 compliant for signal integrity

100 GbE QSFP28 Direct Attach Cable

This 0.5 m passive twinax cable connects two QSFP28 ports at 100 GbE for short-reach links inside or between adjacent racks. It targets network engineers and integrators who need a low-cost, low-latency copper interconnect for compatible switches and NICs. Builders who need longer reach or fibre media cannot use this cable.

Thermals, noise and power draw

As a passive copper assembly it draws no external power and adds no active cooling noise to the rack. The 30 AWG conductors operate from a single 3.3 V supply with minimal EMI, keeping thermal load negligible in dense deployments. Installers who require active signal conditioning for extended distances must choose a different solution.

Compliance and packaging benefits

The cable meets IEEE 802.3, SFF-8665 and QSFP28 MSA specifications and is RoHS compliant across an operating range of 0 to 70 °C. Each unit ships in an antistatic bag with a blue pull tab for easy identification and removal. Buyers who need factory-coded EEPROM data for specific vendor lock-in should verify compatibility before deployment.

Highlights

  • 100 GbE throughput with QSFP28 direct attach
  • Passive copper design draws minimal power and EMI
  • 5 m length fits tight intra-rack connections
  • Broad compatibility with Cisco, Ubiquiti, MikroTik and more
  • IEEE 802.3 and SFF-8665 compliant for signal integrity

Specifications

Length0.5 m

Questions about this item

How do I install the 0.5 m QSFP28 DAC cable and what step is often missed?

Insert each QSFP28 connector straight into the switch port until the latch clicks; the step people miss is pulling the blue tab to release the latch instead of tugging the cable body, which can bend the 30AWG twinax pairs.

What maintenance or replacement will the passive copper assembly need over time?

No firmware or active components exist; inspect the 30AWG conductors and QSFP28 latches during rack moves, and replace the cable if the pull-tab tears or the connectors show bent pins after repeated mating cycles.

What limit appears first when the 100GbE link runs continuously at full load?

The 0~70 °C operating-temperature ceiling is reached before any signal-integrity margin is lost, so sustained line-rate traffic in a hot aisle will hit the thermal limit first.

New to this? Which coin should you pay with — what to check, what it costs to pay, and what is never asked for.

Also in this aisle

People compared these

Same shelf, same checkout — eight coins and a 30-minute rate lock.