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
Black QSFP+ direct-attach twinax cable 0.5 m with latching plugs both ends

STARTECH

STARTECH QSFP40GPC05M 0.5 m 40 GbE network ethernet cable

SKU CH-J9AN-4QEE7 MPN QSFP40GPC05M

A 0.5 m QSFP+ direct-attach copper cable delivering 40 GbE connections with MSA compliance and under 0.1 W power draw

  • TypeNetwork Ethernet Cable
  • CatQSFP+
  • Connector A1 x QSFP+ Latching Plug
  • Connector B1 x QSFP+ Latching Plug
  • Length1.60 ft.
  • ColorBlack
  • Delivers reliable 40 Gbps connections for 40GBase-T compliant networks
  • 5 metre length provides short-reach connectivity within racks
  • MSA compliant design ensures interoperability with standard QSFP+ ports
  • Passive copper twinax construction consumes less than 0.1 W of power
  • Hot-swappable connectors allow replacement without network downtime

Direct-attach copper for 40 GbE links

This 0.5 metre QSFP+ twinax cable provides a passive, MSA-compliant connection rated at 40 Gbps. It draws less than 0.1 W and is hot-swappable with fibre or other copper DACs. The latching plugs on both ends secure the link in dense rack environments.

Passive design removes active-optics cost and power

By using copper instead of fibre the cable eliminates transceivers and their associated power draw. Lifetime warranty coverage from StarTech.com applies to the assembly. The short 1.6 ft length keeps latency minimal for intra-rack or adjacent-device runs.

Suits builders needing ultra-short 40 GbE copper

Ideal for switch-to-switch or switch-to-server uplinks inside a single rack where 0.5 m reaches both ports. Not suited for runs that exceed this length or for deployments requiring optical isolation. Buyers needing longer reaches or fibre media should consider other cable types.

Highlights

  • Delivers reliable 40 Gbps connections for 40GBase-T compliant networks
  • 5 metre length provides short-reach connectivity within racks
  • MSA compliant design ensures interoperability with standard QSFP+ ports
  • Passive copper twinax construction consumes less than 0.1 W of power
  • Hot-swappable connectors allow replacement without network downtime

Specifications

BrandStarTech.com
ModelQSFP40GPC05M
TypeNetwork Ethernet Cable
CatQSFP+
Connector A1 x QSFP+ Latching Plug
Connector B1 x QSFP+ Latching Plug
Length1.60 ft.
ColorBlack
FeaturesDelivers reliable 40Gbps connections for 40GBase-T compliant networks
StarTech.com SFP cables are backed by a lifetime warranty
Uses a cost-effective cabling alternative to fiber-optic setups
Meets or exceeds OEM specifications and MSA (Multi-Source Agreement) industry standards
Low power consumption of less than 0.1 W
Hot-swappable
Shipping weight0.11 kg
Package size325 × 250 × 25 mm

Questions about this item

Will the QSFP+ latching plugs wear out if I unplug the cable for maintenance?

The latching mechanism is rated for repeated insertion cycles typical of data-centre hot-swap operations.

What stops the 40 GbE link from running at full speed continuously?

The passive twinax design limits reach to 0.5 m; beyond that distance signal integrity degrades and errors appear first.

How much heat and power does the cable add when it carries 40 Gbps all day?

The passive copper assembly draws less than 0.1 W and produces no measurable heat rise in the rack.

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.