Lekuo USB4 to Dual 25G SFP28 Network Adapter (DTB3F25)
The Lekuo DTB3F25 is a USB4 dual-port 25GbE SFP28 network adapter designed for professionals who need blazing-fast, flexible networking without opening their device. Delivering up to 40Gbps total bandwidth over a single USB4 or Thunderbolt connection, it is the ideal 25G NIC upgrade for MacBook Pro, Mac Mini, Mac Studio, Synology NAS, QNAP NAS, and Windows 11 workstations.
Dual 25G SFP28 Ports — Up to 40Gbps Real-World Throughput
Equipped with two independent 25GbE SFP28 ports, each capable of 25Gbps line-rate, this adapter aggregates up to 40Gbps of real-world throughput over a single USB4 / Thunderbolt 4 connection. Both ports operate simultaneously, making it ideal for 4K/8K video editing, large NAS file transfers, and virtualization environments where bandwidth is split across multiple streams.
Supports LACP (Link Aggregation Control Protocol) and SMB Multichannel, enabling both ports to work in tandem for maximum throughput or failover redundancy when connected to a compatible 25G switch.
Thunderbolt 5 / 4 / 3 & USB4 Compatible
Fully compatible with Thunderbolt 5, Thunderbolt 4, Thunderbolt 3, and USB4 hosts. Works seamlessly with the latest MacBook Pro (M3/M4), Mac Mini, Mac Studio, and Windows 11 laptops and desktops equipped with a Thunderbolt or USB4 port — no PCIe slot required.
60W Pass-Through PD Charging
Keep your laptop powered while transferring at full speed. The built-in 60W Power Delivery pass-through lets you charge your MacBook Pro or Windows laptop simultaneously — no extra power adapter needed on your desk.
Plug-and-Play on macOS — Driver-Free
Completely driver-free on macOS — connect and start transferring at full 25G speed within seconds. Windows 11 and mainstream Linux distributions are also fully supported. Perfect for Proxmox VE, TrueNAS, and homelab environments.
Wide SFP28 Module & DAC Cable Compatibility
Supports standard 25G SFP28 optical modules and DAC/AOC cables from major brands. Compatible with SR (850nm, up to 100m), LR (1310nm, up to 10km) modules and direct-attach copper cables — flexible for both short rack deployments and long-distance runs. Also backward compatible with 10G SFP+ modules via auto-negotiation.
Compact Aluminum Design — Built for Professionals
The compact aluminum enclosure provides efficient passive heat dissipation while keeping the adapter lightweight and portable. Perfect for on-site video production, remote server management, studio workflows, and Synology / QNAP NAS 25G upgrades without adding a PCIe card.
Package Contents
- 1x Lekuo USB4 to Dual 25G SFP28 Network Adapter (US Plug / EU Plug)
- 1x USB4 Cable
- 1x Quick Start Guide
Technical Specifications
| Brand | Lekuo |
| Model | DTB3F25 |
| Upstream Interface | 1× USB4 40Gbps (compatible with Thunderbolt 3/4/5) |
| Downstream Interface | 1× USB4 40Gbps (60W PD output + daisy-chain support) |
| Network Ports | 2× SFP28 |
| Network Speed | 25Gb/s / 10Gb/s auto-negotiation |
| Duplex | Full Duplex |
| Jumbo Frames | Supported, up to 9000 Bytes |
| Actual Performance | ≈ 2.75 GB/s (internal network environment) |
| PD Charging Output | 60W |
| Power Supply | External DC power adapter (included) |
| LED Indicators | Solid yellow = 25G link established / Blinking yellow = data transfer / Off = no connection |
| Dimensions | 152 × 95 × 29 mm |
| Weight | Net: 360g / Gross: 765g |
| OS Support | macOS (plug-and-play, no driver), Windows 11/10, Linux |
