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Black Y-split cable with USB-C and slim-tip power connectors, 0.7 m

Lenovo

Lenovo 4X91K16970 Thunderbolt 4 Workstation Dock Split Cable 0.7m

SKU CH-3EMM-1DZT7 MPN 4X91K16970

A 0.7 m Thunderbolt 4 split cable combining power and data for ThinkPad workstation docks at 40 Gbit/s

  • Thunderbolt 4 delivers 40 Gbit/s data speed for rapid file transfers
  • Split cable combines slim-tip power and Thunderbolt 4 in one 0.7 m connection
  • Supports up to 100 W charging via USB-C or 170 W/230 W through DC plug
  • 70 cm length reduces desk clutter while reaching the dock
  • Genuine Lenovo replacement for lost or damaged original workstation dock cable

Purpose-built replacement cable

This 0.7 m split cable combines a slim-tip power lead with a Thunderbolt 4 data link for the Lenovo Thunderbolt 4 WorkStation Dock. It restores the original single-cable connection between dock and ThinkPad when the in-box cable is lost or damaged. The male Thunderbolt 4 Type-C plug delivers up to 40 Gbit/s bandwidth for displays and peripherals.

Sustained throughput and power delivery

The cable maintains the full 40 Gbit/s Thunderbolt 4 signalling rate during extended file transfers or multi-monitor workloads without thermal throttling. It carries up to 100 W over the USB-C path and supports 170 W or 230 W through the DC barrel connector, so the dock can charge the host continuously under heavy load.

Straightforward installation

Simply connect the combined plug to the dock and the single Thunderbolt 4 Type-C end to the laptop; no drivers or firmware updates are required. The fixed 0.7 m length reduces desk clutter but limits placement flexibility, so verify the dock-to-laptop distance before purchasing. Buyers needing a longer reach or a non-split cable will need a different solution.

How it compares

Measured against everything we stock in USB-C & Laptop Docking Stations, at today’s prices. Recalculated every night.

Price $32.99
Cheaper than about 86% of the 1,971 comparable items (median $81.99).

Specifications

Product
Brand nameLenovo
Size & build
Shipping weight0.09 kg
Package size140 × 115 × 28 mm

Questions about this item

Does the 0.7 m split cable generate noticeable heat or draw extra power when the dock runs all day?

The cable is a passive Thunderbolt 4 link rated for 40 Gbit/s and up to 100 W over USB-C or 170 W/230 W via the DC plug, so it adds no active heat or power draw of its own.

What must I already own for this split cable to work with my ThinkPad?

You need a ThinkPad Thunderbolt 4 WorkStation Dock and a ThinkPad that accepts the dock’s slim-tip power connector and Thunderbolt 4 Type-C connection.

Will this 70 cm cable still reach if I keep my older ThinkPad on a stand behind the dock?

At 0.7 m the cable is designed for close desk placement; if the older laptop sits farther back you may need a longer Thunderbolt 4 cable instead.

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