What makes a USB-C cable 240 W capable?

USB PD 3.1 Extended Power Range (48 V at 5 A) plus an E-Marker rated for 5 A — not the connector shape.

Answer: the cable must be built for USB Power Delivery 3.1 Extended Power Range (48 V at 5 A) and carry an E-Marker rated for 5 A.

Power	Voltage / current	Requirement
Up to 100 W	20 V / 5 A	E-Marker required above 3 A
Up to 240 W	48 V / 5 A (EPR)	EPR build + E-Marker reporting 5 A

All USB-C cables look the same; the connector shape tells you nothing about 240 W.

Frequently asked questions

What makes a USB-C cable 240 W capable?

A USB PD 3.1 EPR build (48 V at 5 A) plus an E-Marker rated for 5 A.

About the author

Tonetron Engineering Team· Dongguan Taitron Electronic Limited

Tonetron is the export brand of Dongguan Taitron Electronic Limited, a cable and connectivity manufacturer in Dongguan, Guangdong, China. Our engineering and QA teams write these guides from our own production and test experience — including HDMI Forum ATC confirmations (certificates 5QSIMQP4DLG, 2JCHSF3SL1X, MG3CQ3Z4BAG) and USB-IF USB4 certification testing passed under TID 6801. Our USB-IF membership has since lapsed, so that entry is no longer in the public USB-IF product search; the certificate itself is published on our credentials page. The credential you can verify yourself right now: we have been a licensed HDMI™ Adopter since June 2005 — searchable under “Dongguan Taitron” in the official HDMI™ Adopter directory.

What makes a USB-C cable 240 W capable?

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What makes a USB-C cable 240 W capable?

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