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Short braided cable with barrel connector and USB-C plug with LED display

Fervit

Fervit DC 7.9x5.4mm to USB-C Cable with LED Display 140W 21cm

SKU CH-CPAC-6X3JD

Converts a 7.9x5.4mm DC input to USB-C output with a built-in LED display showing real-time voltage, current and power up to 140W

  • 140W Power Delivery charges laptops fast
  • LED screen shows live voltage, current and power
  • Braided jacket resists tangles and wear
  • 21cm length fits bags and tight spaces
  • Auto-switching output protects phones, tablets and laptops

DC 7.9x5.4mm to USB-C Cable

This 21cm adapter cable converts a DC 7.9x5.4mm barrel input into a USB-C output with Power Delivery up to 140W. It targets users who need to power modern Type-C laptops, tablets or phones from an existing 15V to 20.5V DC source such as a proprietary power brick or portable power station.

Pre-Purchase Compatibility Check

Verify that your DC source operates within the 15V to 20.5V input range and can supply enough current for the desired output profile. Confirm the barrel connector on your source matches the 7.9mm outer and 5.4mm inner dimensions exactly. Ensure the target device accepts USB-C PD and will negotiate one of the supported output levels: 5V/1.5A, 9V/2A or 20V/7A.

Build Integration and Use Cases

The cable’s braided jacket resists tangling while the integrated LED display shows real-time voltage, current and power during charging. It bridges legacy barrel-output chargers to USB-C gear without requiring a bulky replacement adapter, freeing up outlet space and reducing cable clutter. Supported protocols include PD, QC 2.0/3.0, DCP, PE+/PE 2.0, FCP, AFC, SFCP and SCP for broad device negotiation.

How it compares

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

Price $19.99
Pricier than about 77% of the 15,227 comparable items (median $14.99).

Specifications

Product
Brand nameFervit

Questions about this item

Does the cable include the DC power adapter or must I supply my own 15 V to 20.5 V source?

Only the 21 cm braided cable with the 7.9 mm by 5.4 mm DC plug and USB-C connector is included; a compatible DC power source delivering 15 V to 20.5 V must be provided separately.

Should I choose this 140 W cable for a laptop that only draws 65 W or 100 W?

The cable automatically negotiates 5 V at 1.5 A, 9 V at 2 A, or 20 V at 7 A, so it safely charges 65 W and 100 W laptops as well as 140 W models.

What does the 140 W rating mean when I plug the cable into my MacBook or XPS?

It indicates the cable can deliver up to 20 V at 7 A via Power Delivery; your device will draw only the power it negotiates, so a 100 W laptop charges at 100 W, not 140 W.

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