10 Best Direct Attach SFP28 Cables of 2026 for Fast, Reliable 25G Links

If you need a simple, affordable way to connect 25GbE switches, servers, or NICs, a direct attach SFP28 cable is often the easiest fit. It delivers short-run speed without the cost or complexity of optical transceivers.

Below, we focus on the most practical options for common vendor ecosystems, cable lengths, and passive DAC use cases so you can choose with confidence.

Best 10 Direct Attach Sfp28 Cable Picks for 2026

Top Cisco-Compatible Pick – 10Gtek 25GBASE-CR SFP28 to SFP28 Passive DAC, 2m

If you need a direct attach sfp28 cable for a Cisco-based 25GbE link, this 10Gtek passive DAC is built for straightforward compatibility and low-latency connections. The 2-meter length works well for rack-level interconnects, and the 30AWG copper design keeps it practical for data center use.

Best For: Cisco SFP28 environments, top-of-rack links, and enterprise interconnects that need a 2m passive DAC.

Pros:

• 100% compatible with Cisco SFP-H25GB-CU2M and other common SFP28 devices
• Passive 25GBASE-CR design with ultra-low latency and low power consumption
• Individually tested and backed by 3-year warranty plus lifetime support
• 2-meter length suits rack-to-rack or adjacent equipment runs

Cons:

• Fixed 2-meter length may be too long or too short for some racks
• Passive DAC is best for short-distance connections only

Overall, this is a dependable choice when Cisco compatibility is the priority and you want a tested, MSA-compliant 25G cable for short-haul connectivity.

Best Blue Twinax Option – 10Gtek Blue 25GBASE-CR SFP28 DAC for Mellanox, 2m

This direct attach sfp28 cable is a simple fit if you’re building a 25GbE link around Mellanox hardware and want a passive, short-run copper option. At 2 meters, it is aimed at data center top-of-rack, wireless backhaul, and enterprise interconnect use.

Best For: Mellanox MCP2M00-A002 setups needing a blue 2m SFP28 DAC for short-distance 25G connectivity.

Pros:

• 100% compatible with Mellanox MCP2M00-A002
• Passive 25GBASE-CR design with low power and low latency
• Blue cable color makes it easier to identify in busy racks
• Individually tested and supported with 3-year warranty and lifetime help

Cons:

• Only offered in a fixed 2-meter length
• Blue color may not match every cable management scheme

If you need a Mellanox-ready direct attach cable for short 25G runs, this model covers the essentials without extra complexity.

Best Short-Run Budget Pick – H!Fiber 25G SFP28 DAC Cable, 1m

For a compact direct attach sfp28 cable, this 1-meter H!Fiber DAC keeps the run short and practical for server room or rack use. It is built as a passive 25Gb/s copper twinax cable and is positioned as a low-cost, low-power, low-latency option for connecting 25G SFP28 ports.

Best For: Short 1m 25G links in racks and server rooms, especially when you want broad multi-brand compatibility.

Pros:

• 1-meter length is ideal for tight rack layouts
• Compatible with Cisco SFP-H25GB-CU1M and many other brands
• Compliant with SFF-8402 and SFF-8432, plus SFP+ MSA SFF-8431 compatibility
• Passed TDR and VNA testing with 3-year warranty and lifetime support

Cons:

• Short 1m length may not suit wider rack spacing
• Product details list a generic connector type rather than brand-specific hardware

This is a strong fit when you want a short, standards-focused DAC cable for 25G connectivity and don’t need extra reach.

Best Dell-Compatible Choice – 10Gtek 25GBASE-CR SFP28 DAC for Dell, 2m

If your setup needs a direct attach sfp28 cable for Dell 25GbE gear, this 10Gtek passive DAC is designed around the Dell 470-ACFB. The 2-meter length and copper twinax construction make it a sensible option for short data center runs, wireless backhaul, and enterprise networking.

Best For: Dell 470-ACFB users and other 25GbE SFP28 environments that need a tested 2m passive cable.

Pros:

• 100% compatible with Dell 470-ACFB
• 2-meter passive 25GBASE-CR cable with low power and low latency
• Individually tested and backed by 3-year warranty plus lifetime technology support
• Suitable for data center networking, wireless backhaul, and enterprise networking

Cons:

• Fixed 2-meter length may not fit every rack layout
• Passive DAC is intended for short-distance use

For Dell-focused 25G connections, this model is a straightforward, practical copper DAC with the expected short-run performance profile.

Top Pick for Cisco and Mixed-Vendor Racks – 1m 25G SFP28 DAC

If you need a direct attach sfp28 cable for short 25GbE links, this 1-meter 10Gtek passive DAC is built for practical data center use. It’s a straightforward choice for top-of-rack connections, wireless backhaul, and enterprise interconnects, with compatibility called out for Cisco, Ubiquiti, MikroTik, Supermicro, Netgear, and open switch environments.

Best For: Short 25GbE runs where broad compatibility and a 1-meter passive direct-attach cable are the priority.

Pros:

• 1-meter passive 25GBASE-CR SFP28-to-SFP28 twinax design.
• Compatible with a wide range of Cisco, Ubiquiti, MikroTik, Supermicro, and Netgear gear.
• Individually tested, with TDR and VNA testing mentioned in the notes.
• Backed by 3-year warranty and lifetime technology support.

Cons:

• Best suited to short runs; 1 meter may be limiting in some racks.
• Passive DAC design is intended for direct short-distance interconnects, not longer spans.

This is a solid pick if your priority is a dependable, short direct attach sfp28 cable with broad device support. The 30AWG build and verified testing make it a sensible fit for rack-level 25GbE connections where simplicity matters.

Best for Arista Compatibility – 1m 25G SFP28 DAC

For buyers seeking a direct attach sfp28 cable tailored to Arista gear, this 1-meter passive 25G DAC is a clean match for CAB-S-S-25G-1M compatibility. It’s aimed at the usual short-run 25GbE jobs in data center top-of-rack, wireless backhaul, and enterprise interconnect setups, while keeping the same SFP28 form factor and 30AWG twinax construction.

Best For: Arista-focused 25GbE connections where a 1-meter passive direct-attach cable is needed.

Pros:

• 100% compatible with Arista CAB-S-S-25G-1M per the product notes.
• 1-meter passive 25GBASE-CR SFP28-to-SFP28 twinax cable.
• Suitable for top-of-rack, wireless backhaul, and enterprise interconnect use.
• Individually tested and backed by a 3-year warranty plus lifetime support.

Cons:

• Short 1-meter length only fits close-proximity connections.
• Arista-specific compatibility focus may be less appealing for mixed-vendor racks.

If your environment is built around Arista and you want a simple, verified short-run cable, this model keeps the choice focused. It’s a practical direct attach sfp28 cable for 25GbE ports when you want the right match without extra complexity.

Best Longer Reach Option – 3m 25G SFP28 DAC

If your direct attach sfp28 cable needs a little more reach, this 3-meter passive 10Gtek DAC is the longer option in the lineup. It keeps the same 25GBASE-CR SFP28-to-SFP28 design as the shorter version, but adds extra length for rack-to-rack or wider in-cabinet routing while staying aimed at 25GbE top-of-rack and enterprise interconnect applications.

Best For: 25GbE installs that need a 3-meter passive direct-attach cable for more routing flexibility.

Pros:

• 3-meter passive 25GBASE-CR SFP28-to-SFP28 twinax cable.
• Compatible with Cisco SFP-H25GB-CU3M, Ubiquiti UC-DAC-SFP28, MikroTik XS+DA0031, Supermicro, Netgear, and open switches.
• Individually tested and noted as TDR/VNA tested in the lab.
• Backed by 3-year warranty and lifetime technology support.

Cons:

• Longer than the 1-meter options, so it may be more cable than tightly packed racks need.
• Passive DAC design is still intended for short direct connections, not extended runs.

This version is the sensible pick when 1 meter is too short and you want the same 25G SFP28 DAC approach with extra slack. It keeps the practical advantages of a direct attach sfp28 cable while giving you more room for cleaner cable management.

Juniper DAC Pick – 1-meter passive SFP28 DAC for Juniper 25G links

If you need a direct attach sfp28 cable for a Juniper 25GbE link, this 1-meter 10Gtek passive DAC is built for straightforward short-run connectivity. It uses SFP28 to SFP28 twinax construction, is rated for 25GBASE-CR, and is designed for data center top-of-rack, wireless backhaul, and enterprise interconnect use.

Best For: Juniper users who want a 1-meter passive SFP28 DAC for 25GbE switch, server, or NIC connections.

Pros:

• 100% compatible with Juniper JNP-SFP-25G-DAC-1M.
• Passive 1-meter 30AWG twinax cable keeps short rack runs simple.
• Individually tested on switches and backed by a 3-year warranty.
• Works with 25GbE SFP28 ports across switches, routers, servers, and NICs.

Cons:

• Only 1 meter long, so it is not suited for longer rack spacing.
• Passive DAC design is intended for short direct connections rather than extended runs.

For buyers focused on a proven Juniper-compatible direct attach sfp28 cable, this model is a practical pick for short, high-speed copper links. Its main strengths are compatibility, tested performance, and a simple passive design.

Compact Cisco DAC – 0.5-meter passive SFP28 cable for dense racks

This direct attach sfp28 cable is a compact 0.5-meter option for short 25GbE links where cable slack should be kept to a minimum. It is a passive SFP28 to SFP28 DAC built for Cisco, Ubiquiti, MikroTik, Supermicro, Netgear, and open-switch environments, making it a flexible fit for tight rack layouts.

Best For: Network builds that need a very short 25G SFP28 DAC for Cisco or mixed-vendor hardware.

Pros:

• 100% compatible with Cisco SFP-H25GB-CU0.5M.
• Also listed for Ubiquiti, MikroTik, Supermicro, Netgear, and open switches.
• Passive 0.5-meter 30AWG twinax design suits tight rack spacing.
• Individually tested and backed by lifetime technology support.

Cons:

• Very short length may be too limiting outside dense rack setups.
• Passive DAC is best for short direct runs, not flexible routing.

If your priority is a short, dependable direct attach sfp28 cable for a dense rack, this model keeps things neat while covering a wide range of vendor compatibility. The 0.5-meter length is its biggest advantage and also its main limitation.

Blue Multi-Vendor DAC – 1-meter passive SFP28 cable for Cisco and more

For buyers comparing a direct attach sfp28 cable that can fit common Cisco and multi-vendor 25GbE setups, this 1-meter blue 10Gtek DAC is a straightforward option. It is a passive SFP28 to SFP28 twinax cable rated for 25GBASE-CR use and aimed at data center, networking, and high-performance computing applications.

Best For: Cisco-based or mixed-vendor 25GbE installations that need a 1-meter passive SFP28 DAC.

Pros:

• 100% compatible with Cisco SFP-H25GB-CU1M.
• Also listed for Ubiquiti UC-DAC-SFP28, MikroTik XS+DA0001, Supermicro, Netgear, and open switches.
• 1-meter passive 30AWG twinax cable fits standard short rack links.
• Individually tested and covered by 3-year free warranty support.

Cons:

• Passive design is intended for short direct connections only.
• The product notes include multiple naming variations, which may require a quick compatibility check.

This is a balanced choice if you want a common 1-meter direct attach sfp28 cable with broad device support and a familiar Cisco match. The blue finish is a simple visual cue, but the real value is the multi-vendor compatibility and tested build.

How We Picked the Best Direct Attach Sfp28 Cable

For this roundup, we prioritized compatibility with major networking brands, clear 25GBASE-CR support, passive DAC construction, and the most useful cable lengths for rack-to-rack and in-rack connections. We also favored listings that clearly identify device compatibility, since the biggest buying mistake with a Direct Attach Sfp28 Cable is choosing the wrong vendor-coded or unsupported model.

Quick Comparison

Most of these cables are passive 25G SFP28-to-SFP28 DACs, which makes them best for short distances inside the same rack or between adjacent racks. The main differences are compatibility targets, jacket color, and available lengths such as 0.5m, 1m, 2m, and 3m. If your gear is Cisco, Dell, Ubiquiti, Arista, Juniper, or Mellanox, matching the coded part number matters more than the cable brand itself.

Key Buying Factors for Direct Attach Sfp28 Cable

Compatibility and Coding

Always verify that the cable is coded for your switch or server platform. Even when two cables share the same 25GBASE-CR standard, firmware may reject unsupported modules or show warnings.

Length

Choose the shortest length that still allows clean routing and service slack. Shorter cables usually mean less clutter and easier airflow, while longer cables help when gear is not perfectly aligned in the rack.

Passive Vs. Active

Most buyers shopping for a Direct Attach Sfp28 Cable want passive DAC because it is lower cost and ideal for short runs. If you need more reach or have stricter signal requirements, confirm whether an active cable would be better for your environment.

SFP28 and SFP+ Compatibility

Some listings note SFP+ compatibility or mixed labeling, but you should not assume every port will negotiate the same way. Check your device port speed support and whether the hardware accepts 25G DACs in that form factor.

Environment and Management

Color, bend radius, and cable labeling can matter in dense deployments. A blue jacket may help with visual identification in a crowded rack, while a standard black cable may blend in more easily with existing cabling.

Who Should Buy Which Direct Attach Sfp28 Cable?

If you are building a budget-conscious 25G link in a short rack run, a passive Direct Attach Sfp28 Cable is usually the best value. If you run Cisco, Dell, Arista, Juniper, Ubiquiti, or Mellanox hardware, prioritize the exact coded model that matches your platform. For tight cable management, pick 0.5m or 1m; for cross-rack or less predictable layouts, 2m or 3m is the safer choice.

In short, the best pick is the one that matches your hardware, fits your distance, and keeps your deployment simple.