StarTech ST3300GU3B USB 3.0 3-Port Hub with Gigabit Ethernet Adapter

Overview

The StarTech ST3300GU3B solves a common problem on ultrabooks and slim laptops: you need peripheral ports and a wired network connection, but the machine ships with only one or two USB-A ports and no Ethernet jack. This compact aluminum hub adds three USB 3.0 ports running at up to 5 Gbps each alongside a true Gigabit Ethernet port — all through a single USB connection from the host. At 3.4 x 1.7 x 0.6 inches and 2.2 oz, it sits flat on a desk or rides in a bag without adding meaningful weight to a mobile kit. The 5.8-inch integrated cable gives you enough reach to position the hub without the host port acting as a mechanical stress point.

Key Features

• Three USB 3.2 Gen 1 Ports at 5 Gbps: Each port runs at USB 3.2 Gen 1 speeds — up to 5 Gbps — which means a USB-attached SSD or high-resolution webcam won't bottleneck at the hub. You're not sharing a single slow upstream connection across budget-tier ports; the hub's bus interface is USB 3.2 Gen 1 throughout, so high-bandwidth peripherals get the headroom they need.
• Gigabit Ethernet (10/100/1000 Mbps): The onboard NIC supports full 1000BASE-T Gigabit, with auto-negotiation down to 10/100 Mbps for legacy switches. For field deployments where Wi-Fi is unreliable or locked down by IT policy, wired Gigabit from a single USB connection is a practical solution without requiring a separate USB-to-Ethernet dongle and consuming another port.
• UASP (USB Attached SCSI Protocol) Support: UASP reduces CPU overhead and improves sequential throughput for compatible storage devices — relevant if you're transferring large video files or disk images. On UASP-capable drives, real-world sequential performance can approach the theoretical 5 Gbps ceiling more closely than legacy BOT (Bulk-Only Transport) mode allows.
• Jumbo Frame Support up to 4K: The Ethernet controller supports jumbo frames up to 4K bytes. In environments where the upstream switch also supports jumbo frames — common in NAS-heavy or video production networks — this reduces per-packet overhead and improves throughput for large sequential transfers.
• IEEE 802.3az Energy-Efficient Ethernet: The NIC implements 802.3az, which reduces power draw on the Ethernet link during low-traffic periods. Combined with a 10W maximum power consumption from the included 100–240V AC adapter, the hub keeps its power footprint modest on shared circuits.
• 802.1q VLAN and 802.1p QoS Tagging: The Ethernet port supports 802.1q VLAN tagging and 802.1p priority marking, so it can participate in segmented enterprise networks without requiring an untagged port or VLAN bypass — useful when connecting to managed switch infrastructure in corporate or production environments.
• Aluminum Enclosure: The aluminum housing dissipates heat more effectively than plastic alternatives and holds up to daily bag-and-desk cycling without cracking at the cable entry point — a common failure mode on cheaper plastic hubs.
• Universal Power Input (100–240V AC): The included power supply accepts any mains voltage from 100 to 240V AC at 0.5A input, outputting 5V DC at 2A. This covers North American, European, and most international outlets without an additional voltage converter — relevant for teams that travel or deploy internationally.

Integration and Compatibility

The ST3300GU3B connects via USB 3.2 Gen 1 (USB-A) and is backward-compatible with USB 2.0 and USB 1.1 hosts — port speed drops to match the host, but the hub remains functional. The Ethernet controller complies with IEEE 802.3, 802.3u, 802.3ab, 802.3az, 802.3x (flow control), 802.1q, and 802.1p, covering the standards expected by enterprise managed switches. Operating temperature is rated 0°C to 50°C, which covers typical office, field kit, and light industrial environments. Storage temperature range extends from -10°C to 75°C, so the unit survives shipping in hot vehicles without damage to the circuitry. Operating humidity is rated to 85% RH non-condensing — adequate for most indoor commercial environments though not suited for outdoor or high-moisture enclosures. For network accessories and connectivity peripherals, this hub fits into a broader USB and Ethernet accessory stack. If you're building out a mobile workstation for IP camera configuration or on-site NVR commissioning, the combination of three USB ports and wired Gigabit in a single unit reduces the dongle count significantly. See the USB hubs and adapters category for additional options, or review our network switches selection if you need managed switching at the edge of your deployment. For teams evaluating power and cabling strategy, the PoE switches section covers upstream infrastructure that pairs with wired Ethernet adapters like this one.

Frequently Asked Questions

Q: What is the maximum data transfer speed on each USB port of the ST3300GU3B?

A: Each of the three USB ports operates at USB 3.2 Gen 1 speeds — up to 5 Gbps. This applies when connected to a USB 3.2 Gen 1 or USB 3.0 host port. When connected to a USB 2.0 host, speeds drop to USB 2.0 maximums (480 Mbps).

Q: Does the ST3300GU3B require external power, or is it bus-powered?

A: The ST3300GU3B ships with an external power supply (100–240V AC input, 5V DC / 2A output). Using the included adapter is recommended when connecting power-hungry USB peripherals to ensure stable operation across all three ports. Total power consumption is rated at 10W maximum.

Q: What is the warranty on the ST3300GU3B?

A: StarTech covers the ST3300GU3B with a 2-year manufacturer warranty.

Q: Does the Ethernet port on the ST3300GU3B support VLAN tagging?

A: Yes. The Gigabit Ethernet port supports IEEE 802.1q VLAN tagging and 802.1p QoS priority marking, making it compatible with managed enterprise switch infrastructure requiring tagged ports.

Q: Is the ST3300GU3B compatible with both Windows and Mac operating systems?

A: The available specifications do not list specific OS compatibility. StarTech products in this category typically rely on OS-native drivers for USB hubs and Ethernet adapters — check StarTech's product page for the current OS compatibility matrix before deploying.

Q: What are the physical dimensions and weight of the ST3300GU3B?

A: The unit measures 3.4 inches long x 1.7 inches wide x 0.6 inches tall, with a 5.8-inch integrated cable. It weighs 2.2 oz, making it practical for mobile kit bags without adding significant weight.

Karl Wilson

I reach for the ST3300GU3B when I'm provisioning a field technician's laptop kit and the machine has a single USB-A port plus no Ethernet jack — which describes most current ultrabooks. The 5 Gbps USB 3.2 Gen 1 bus speed and true Gigabit Ethernet in a 2.2 oz aluminum package means one item in the bag replaces three dongles, and the 100–240V AC power supply means the same kit travels internationally without an adapter.

Technical Highlights:

• 5 Gbps per port: USB 3.2 Gen 1 throughput means USB-attached storage used for video evidence transfer or NVR backup won't be throttled at the hub — you're not squeezing three devices through a USB 2.0 ceiling.
• 802.1q / 802.1p Ethernet: VLAN tagging and QoS priority support means this NIC can connect to a managed switch on a segmented security VLAN without requiring the port to be reconfigured to untagged — saves a conversation with the client's IT team on day one.
• 10W max, 802.3az EEE: Energy-Efficient Ethernet reduces link power during idle periods, and the 10W total consumption keeps the hub from being a nuisance load on shared power strips in rack rooms or temporary deployments.

Deployment Considerations:

• The hub's 5.8-inch integrated cable is long enough for most laptop placements but won't reach a docking position more than a few inches from the host port — plan your desk layout accordingly or use a short USB extension if the host port is on the rear of a workstation.
• Operating temperature tops out at 50°C — sufficient for conditioned office and field environments, but don't deploy this inside an unventilated equipment enclosure where ambient temps can spike above that threshold.

The ST3300GU3B is the right call for mobile security integrators and IT field teams who need wired Gigabit plus peripheral expansion on a slim laptop during on-site commissioning, NVR configuration, or camera network setup — where a reliable wired connection matters and bag weight does too.