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Short black cable with USB-C female plug and 4.0 by 1.7 mm DC barrel connector

Fervit

Fervit USB 3.1 Type-C to DC 4.0x1.7mm 20V PD Trigger Cable

SKU CH-B38F-JHPG3

A USB 3.1 Type-C to DC 4.0x1.7mm trigger cable that draws 18-20V from a 65W or 100W PD charger to power laptops with a matching barrel jack

  • Charges legacy laptops via modern USB-C power
  • Built-in PD trigger negotiates 18-20 V from 65 W or 100 W chargers
  • DC 4.0×1.7 mm barrel fits many older notebooks
  • USB 3.1 Type-C female input works with existing GaN bricks
  • No 5 V output prevents accidental low-voltage damage

Purpose and compatibility

This cable lets you power a laptop that uses a 4.0x1.7mm DC jack rated for 18-20V from a USB-C charger. It is built for owners of compatible laptops who want to use a 65W or 100W USB-C power adapter instead of the original brick.

Power negotiation limits

The integrated PD trigger requests 20V from the USB-C source and will not operate at 5V. The charger must be capable of 65W or 100W and its rated output must exceed the laptop's power draw, otherwise the trigger will not activate.

Capacity headroom

With a 100W charger the cable can deliver up to 20V at the full negotiated current, covering most ultraportables and thin-and-light notebooks. It cannot supply power to devices that require a different voltage, a larger barrel connector, or more than the charger's maximum rated output.

Highlights

  • Charges legacy laptops via modern USB-C power
  • Built-in PD trigger negotiates 18-20 V from 65 W or 100 W chargers
  • DC 4.0×1.7 mm barrel fits many older notebooks
  • USB 3.1 Type-C female input works with existing GaN bricks
  • No 5 V output prevents accidental low-voltage damage

Specifications

BrandFervit

Questions about this item

Which cable version should I choose for a 65 W or 100 W USB-C charger?

This single cable works with either a 65 W or 100 W USB-C charger; the charger must simply supply more power than your laptop requires.

What voltage will actually reach my laptop’s DC 4.0×1.7 mm port?

The cable requests 18 V or 20 V from the USB-C charger and passes that voltage to the laptop; 5 V is not supported.

What does the USB 3.1 label mean for charging performance?

USB 3.1 describes the connector generation; the cable’s practical limit is the 100 W ceiling of the USB-C Power Delivery charger you connect.

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