eForChina 4.0 x 1.7mm Female to USB-C Male Adapter

Compact adapter for legacy notebook power

This adapter converts a 4.0 x 1.7 mm barrel connector to a USB-C male plug, letting older laptops draw power from a modern PD charger. It suits users who want to replace a lost proprietary brick with a single multi-port GaN supply. The tiny 53 x 15 x 13 mm housing weighs about 9 g and slips into any cable pouch.

Requires a PD-capable charger and correct polarity

The unit needs a USB-C power source that supports Power Delivery; a standard 5 V phone charger will not activate the notebook. Polarity is fixed, so reversing the barrel plug prevents operation and could damage equipment. No driver or software is involved — the connection is purely passive once the PD handshake succeeds.

Delivers up to the notebook’s rated barrel input

The adapter passes whatever voltage and current the PD charger negotiates, up to the limits of the 4.0 x 1.7 mm jack on the target machine. It cannot increase wattage beyond what the charger provides, so high-draw gaming laptops may still need their original high-wattage supply. Barrel tips with different inner diameters are not compatible.