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Space Gray USB-C to RJ45 adapter, aluminium body, compact rectangular shape

Ugreen 35921 USB converter Space Gray 5Gb Thunderbolt compatible

SKU CH-0YQG-CYNW1

A 5 Gbps USB-C to RJ45 adapter with aluminium thermal design and Realtek RTL8157 chip for low heat, compatible with Windows 11, macOS 15 and Linux kernel 5.17

  • Product colorSpace Gray
  • Product dimensions9.4 in × 3.3 in × 1.5 in
  • Product weight82 g
  • 5 Gbps wired speed boosts large-file transfers
  • Realtek RTL8157 chip cuts power draw and heat
  • Works with Windows 11, macOS 15+, Linux Kernel 5.17
  • Aluminium shell with hidden vents keeps temps low
  • Wake-on-LAN and EEE 802.3az support remote wake and efficiency

Ugreen 35921 5Gb Ethernet Adapter

The Ugreen 35921 USB converter adds a 5Gb wired network link to laptops and desktops through a USB Type C port. It is aimed at creators and professionals who move large files to NAS or servers and need more throughput than a standard Gigabit connection provides. The adapter uses a Realtek RTL8157 chip and requires a host port that meets USB 3.2 Gen2 10Gbps or higher plus CAT6 or better cabling. It is not for buyers who only have USB 2.0 or USB 3.2 Gen1 ports.

Aluminium Casing with Thermal Design

The aluminium housing integrates hidden dissipation holes that help move heat away from the RTL8157 chip during sustained 5Gb or 2.5Gb transfers. The controller automatically switches to a Lite mode at those speeds to limit temperature rise. Power consumption is reduced by the chip design and the adapter supports ACPI, LPM and IEEE 802.3az Energy Efficient Ethernet. No indicator light is fitted on the unit.

Direct Host Connection Required

The converter must plug straight into the host USB Type C port; it is not compatible with hubs, docking stations, extension cables or USB-A to USB-C adapters. On Windows 11 and Linux Kernel 5.17 a driver install is needed while macOS 15 and above works plug and play. Apple Silicon support is limited to M3 and later chips; M1 and M2 machines cannot use this adapter. Energy-saving modes on the host should be disabled for reliable operation.

How it compares

Measured against everything we stock in USB Adapter Cables & Dongles, at today’s prices. Recalculated every night.

Price $63.99
Pricier than about 90% of the 1,430 comparable items (median $14.99).

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Specifications

Product
Brand nameUgreen
Model name35921
Part number35921
Product colorSpace Gray
Size & build
Product dimensions9.4 in × 3.3 in × 1.5 in
Product weight82 g

Questions about this item

How do I install the Ugreen 35921 USB converter and what is the common mistake?

Plug it directly into a USB 3.2 Gen2 (10Gbps) or higher port on your device; the step people miss is using an adapter, hub, extension cable or docking station instead of a direct connection, which prevents 5Gb speeds.

What maintenance or replacement will the Ugreen 35921 need over time?

No routine maintenance is required; the aluminium casing with integrated heat-dissipation holes and the RTL8157 chip handle thermal management, so the adapter only needs replacement if the USB-C connector or RJ45 port physically fails.

What limit appears first during sustained 5Gb use of the Ugreen 35921?

The adapter automatically switches to Lite mode at 5Gb or 2.5Gb to avoid overheating, so thermal throttling is the first constraint you will encounter under continuous heavy load.

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