Sonnet Twin25G Thunderbolt Dual Port 25Gb Ethernet Adapter (SFP28s included)

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Sonnet Twin25G Thunderbolt Dual Port 25Gb Ethernet Adapter (SFP28s included)


Sonnet Twin25G Thunderbolt Dual Port 25Gb Ethernet Adapter (SFP28s included)

Incredible 25GbE Connectivity Over Thunderbolt

Many post-production shared storage workgroups and other bandwidth-intensive workflows have reached a point where 10Gb Ethernet (10GbE) does not provide enough bandwidth and speed for optimum performance. Stepping up to 25Gb Ethernet (25GbE) makes a lot of sense — it offers greater performance and often works with the same optical network infrastructure as 10GbE. For these workgroups, there is now a cost-effective 25GbE interface for your Mac®, Windows®, or Linux® computer with Thunderbolt™ 4 or Thunderbolt 3 ports — Sonnet’s Twin25G™, an affordable yet powerful solution for adding incredibly-fast fiber optic 25GbE network connectivity.

Key Features

Adds High-performance 25GbEConnectivity

Simply powerful way to add dual optical 25GbE connections to any computer with Thunderbolt 4 or Thunderbolt ports.

SFP28 Transceivers Included

High-performance adapter includes two 25GBASE SFP28 transceivers.

Backward Compatible

Adapter also supports 10GbE — enables you to integrate with 10GbE infrastructure now and upgrade your switch or shared storage system to 25GbE later.

Mac Compatible, Including Apple M series Macs

Supports Apple M series and Macs with Thunderbolt 4, Thunderbolt/USB4, and Thunderbolt 3 ports.

Windows Compatible

Supports Windows computers with Thunderbolt 4 and Thunderbolt 3 ports.

Linux Compatible

Supports Linux computers with Thunderbolt 4 and Thunderbolt 3 ports.


40Gbps Thunderbolt Device

40Gbps Thunderbolt supports the full bandwidth of one 25GbE port.


Two Thunderbolt Ports

One port connects to computer; second port provides 15W for a Thunderbolt or USB 3 device; or to connect up to an 8K display.
Compact. Nearly Noiseless.
Adapter is small enough to comfortably fit on any desktop, and quiet enough for use in noise-sensitive environments. You’ll hardly notice it’s there.

Technical Specifications


Mac Compatibility

  • Mac (M series)
  • Mac (Intel®) with Thunderbolt 3 ports
  • macOS 13 (Ventura)

Windows Compatibility

  • Windows computer with Thunderbolt 4 or Thunderbolt 3 ports
  • Windows 11 and 10

Linux Compatibility

  • Linux computer with Thunderbolt 4 or Thunderbolt 3 ports
  • Linux Kernel 5.0+


Part Number

  • TWIN25G-TB


  • 2-year

Form Factor

  • Thunderbolt 25GbE adapter

External Connectors

  • Two Thunderbolt ports
    (second prot supports a Thunderbolt peripheral, USB device, or a display)
  • Two SFP28 sockets with two 25GBASE-SR optical transceivers
  • 12V power port

25GbE Controller

  • Mellanox ConnectX

Network Support

  • 25Gb/s
  • 10Gb/s

Teaming (Link Aggregation)

  • Not Supported


  • Maximum packet size: 9000 bytes (jumbo frames)

Data Rates Supported per Port

  • 25Gb/s
  • 10Gb/s

Advanced Features

  • Flow control support
  • MSI (Message Signaled Interrupts)
  • RSS (Receive-Side Scaling)
  • Multicast filtering
  • 64-bit address support for systems using more than 4GB of physical memory
  • Wake-on-LAN not supported

Stateless Offloads

  • TCP, UDP, and IPv4 checksum offloading
  • TRO (TCP Receive Offload)

Power Adapter

  • Universal 60W, 100-240V, 50-60 Hz
  • NRTL Certified

Operating Temperature

  • 0ºC to 35ºC (32ºF to 95ºF)

Dimensions (WxDxH)

  • 4 x 8.25 x 2.75 in. (10.3 x 21 x 7.3 cm)


  • Thunderbolt Adapter and Power Adapter: 2.3 lbs. (1.04 kg)
  • Complete Package: 4.1 lbs. (1.86 kg)


  • RoHS 3 (Directive 2015/863)
  • IEC62368-1 and IEC62368-2 Safety

Package Contents

  • Twin10G 25GbE Thunderbolt Adapter
  • Thunderbolt 3 cable(1)
  • ThunderLok 3 Thunderbolt connector retainer clip(2)
  • Universal power adapter
  • Region-specific power cable for US, Australia, Europe, Japan, Switzerland, or UK
  • Documentation

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