UGREEN 30389 0.8m Active Thunderbolt 4 Cable, 40Gbps, 100W
Overview
UGREEN 30389 is a active Thunderbolt 4 cable for 40Gbps data, display and charging in the 0.8m configuration. Its ceiling is Up to 100W USB Power Delivery (5A) for charging and Up to 40Gbps on compatible Thunderbolt 4/USB4 equipment for data; the listed display limit is Up to single 8K@60Hz or dual 4K@60Hz as listed for this model.
What it does well.
Charging explained without the guesswork
Maximum: Up to 100W USB Power Delivery (5A).
Negotiation: Thunderbolt 4 with active IC; backward-compatible operation depends on the negotiated USB4/Thunderbolt/USB mode at both ends.
The cable does not push maximum power into a device. USB Power Delivery negotiation lets the charger and device select a supported voltage/current combination. Battery state, temperature and system load can change the observed rate during a session.
For full rated power: use a charger port rated for at least the required wattage, avoid multi-port power sharing during the test, and confirm the device accepts that input level.
Key features
Data ceiling. Up to 40Gbps on compatible Thunderbolt 4/USB4 equipment. Marketing file-transfer examples are laboratory illustrations; storage and host speeds determine real results.
Video capability. Up to single 8K@60Hz or dual 4K@60Hz as listed for this model. This requires a compatible video-capable USB-C/USB4/Thunderbolt path.
Backward compatibility. When a faster host meets a slower cable or peripheral, the link normally falls back to the common supported mode; it does not upgrade the slower device.
The USB-C shape trap. USB-C describes the connector, not a single feature set. Charging power, USB speed, DisplayPort Alt Mode and Thunderbolt certification must be checked separately.
Use scenarios
Desk charging. Use the 0.8m reach between a suitable USB-C charger and compatible laptop, tablet or phone.
Power-bank kit. Connect compatible USB-C power banks in the supported direction; check which power-bank port is input/output and its wattage.
File sync. Move ordinary files at up to Up to 40Gbps on compatible Thunderbolt 4/USB4 equipment when both connected devices expose a compatible USB data mode.
Displays and docks. Use compatible USB-C/USB4/Thunderbolt hosts, docks and monitors within the Up to single 8K@60Hz or dual 4K@60Hz as listed for this model ceiling.
Setup and usability guidance
- Step 1: Check the required job before connecting: charging only, ordinary USB 2.0 sync, high-speed storage, display, dock or eGPU.
- Step 2: Confirm both endpoints are USB-C and that 0.8m is the intended length. Similar family products can have different capabilities.
- Step 3: For charging, use a suitable USB-C power adapter and a device that supports the required USB Power Delivery profile. Maximum for this cable is Up to 100W USB Power Delivery (5A).
- Step 4: For data, connect directly and verify the host reports the expected class. This model is rated Up to 40Gbps on compatible Thunderbolt 4/USB4 equipment.
- Step 5: If using a display, connect directly first, select a supported resolution/refresh rate, then add any dock only after the direct path works.
- Step 6: Insert straight and fully. Route a relaxed loop, keep plugs dry and disconnect by the housing rather than the cable.
Compatible devices and systems
Compatibility class: Thunderbolt 4 laptops, docks, monitors and storage; backward-compatible with suitable Thunderbolt 3, USB4 and lower USB modes, with performance reduced to the common capability.
Phones and tablets. USB-C iPhone models, compatible Galaxy/Pixel phones, iPad USB-C models and Android tablets can use the functions their ports support. Lightning models need another cable.
Laptops. MacBook, Windows, Chromebook and other USB-C laptops can charge only up to the charger/device/cable common limit; data/display capability varies by port.
Handhelds and accessories. Steam Deck, Switch, power banks, cameras and controllers may charge or sync when their manuals permit USB-C-to-USB-C operation.
Docks, displays and storage. Use within the interface, speed and display limits. High-performance SSDs and monitors require matching host support.
What this product does
- Connects two compatible USB-C ports with the 0.8m model.
- Carries negotiated charging up to Up to 100W USB Power Delivery (5A).
- Carries data up to Up to 40Gbps on compatible Thunderbolt 4/USB4 equipment on compatible equipment.
- Carries compatible video up to the listed Up to single 8K@60Hz or dual 4K@60Hz as listed for this model ceiling.
- Provides the physical build: Black active USB-C cable with Thunderbolt 4 marking, built-in active IC, moulded strain relief, multi-layer shielding and connector safeguard electronics.
What this product does not do
- not a passive USB 2.0 charging-only cable; 8K/dual-display support is not created on a USB-C port lacking video; not a guarantee that every phone can drive an external screen.
- It does not include a charger or raise a charger/device above its own designed limit.
- It does not guarantee a named charge time, file-copy time or display mode under every battery, thermal, storage and operating-system condition.
- It does not repair a damaged device port, worn battery or unstable charger.
- It does not prove compatibility from connector shape alone; the device and source must support the intended function.
What to do
Match SKU and length. Order SKU 30389, 0.8m. Similar UGREEN variants may differ in power, speed, display and LED features.
Check the full chain. Verify charger port, host port, dock/adapter, peripheral and display specifications—not just the cable headline.
Leave connector slack. Use a gentle service loop so device sockets do not carry the cable weight or repeated side force.
Test directly first. Remove hubs and adapters when diagnosing. Confirm basic charging/data/display directly, then rebuild the system one component at a time.
What not to do
Do not force a plug. Stop if a case, debris or misalignment prevents full insertion. Clean only with devices powered down.
Do not knot or crush. Do not trap the lead under chair wheels, doors or furniture, and do not wind it tightly around a charger.
Do not use when wet. Keep ports and connectors dry. Disconnect damaged, hot, corroded or discoloured equipment and have it checked.
Do not rely on a headline alone. A maximum wattage or resolution is conditional. Confirm the profile, interface and complete route.
Warnings and limitations
Heat: mild warmth can occur during high-power charging; stop use if a plug or cable becomes abnormally hot, smells burnt, arcs or shows damage.
Charging: Up to 100W USB Power Delivery (5A) is a maximum rating, not a promise that a device will request it. Multi-port chargers can lower output when other ports are used.
Data/display: Up to 40Gbps on compatible Thunderbolt 4/USB4 equipment and Up to single 8K@60Hz or dual 4K@60Hz as listed for this model. Real performance depends on every component.
Care: media shows multi-protection electronics and reinforced connector construction; copy does not claim the cable is immune to sharp bends or connector side-load.
How to choose the right UGREEN USB-C cable
Charging only / basic sync. Choose a 480Mbps model whose wattage meets the device. 30389 is Up to 100W USB Power Delivery (5A) and Up to 40Gbps on compatible Thunderbolt 4/USB4 equipment.
Fast SSD or dock. Choose 5Gbps, 10Gbps, 20Gbps, 40Gbps or 80Gbps only when both host and peripheral can use it.
External monitor. Choose a cable that explicitly supports video and the required resolution/refresh; many charging cables do not.
High-power laptop. Match the laptop’s requested wattage. 5A cables need compliant E-Marker electronics; 240W requires USB PD 3.1 equipment.
Troubleshooting
No charging. Check charger power, correct port, device USB-C charging support, connector seating and debris. Test without a dock or adapter.
Charging is slow. Use one charger port, verify the PD profile and watch for device heat, high workload or battery-health settings that reduce charge rate.
No data. Some charger ports are power-only. Try a known data-capable host port, confirm device mode/unlock state and test a different peripheral.
No display. Confirm the host USB-C port supports video, then test directly at a lower resolution/refresh before adding a dock.
Connection drops. Remove strain, hubs and adapters; reseat straight; update host/dock firmware; and test each component separately to find the failing link.
Unexpected warmth. Stop high-power use, inspect for damage and retry with certified compatible charger/device equipment in a ventilated area.
Final compatibility check
Match SKU 30389, 0.8m, Up to 100W USB Power Delivery (5A), Up to 40Gbps on compatible Thunderbolt 4/USB4 equipment and Up to single 8K@60Hz or dual 4K@60Hz as listed for this model. Check every charger, port, dock and destination in the route before ordering.
At a glance.
- Brand / SKU
- UGREEN 30389
- Product type
- active Thunderbolt 4 cable for 40Gbps data, display and charging
- Connector A
- USB-C male
- Connector B
- USB-C male
- Length
- 0.8m
- Colour
- Black
- Charging
- Up to 100W USB Power Delivery (5A)
- Charging negotiation
- Thunderbolt 4 with active IC; backward-compatible operation depends on the negotiated USB4/Thunderbolt/USB mode at both ends
- Data
- Up to 40Gbps on compatible Thunderbolt 4/USB4 equipment
- Video
- Up to single 8K@60Hz or dual 4K@60Hz as listed for this model
- Construction
- Black active USB-C cable with Thunderbolt 4 marking, built-in active IC, moulded strain relief, multi-layer shielding and connector safeguard electronics
- Interface
- Thunderbolt 4, active cable
- Maximum data rate
- 40Gbps
- Maximum stated power
- 100W USB PD
- Maximum listed single display
- 8K@60Hz
- Maximum listed dual display
- 2 Ă— 4K@60Hz
- Active electronics
- Built-in active IC
1 Ă— UGREEN 30389 0.8m active Thunderbolt 4 cable
No charger, phone, tablet, laptop, monitor, dock, power bank or storage device is included unless the retail package explicitly states otherwise.