Apple 67W USB-C Power Adapter on a MacBook Air: Measured

Apple's 67W USB-C adapter measured on a MacBook Air: a 65.4 W contract at 3.27 A, requiring a 5A cable to deliver its full power.

Apple 67W USB-C Power Adapter, model A2518, with folding prongs.

Apple’s 67W USB-C power adapter, tested against a MacBook Air with a low battery, per the methodology .

67.0W 45.0W 27.0W 15.6W. Input 100-240V~ 1.65A 50-60Hz. EMC 3956. USB PD Output 20.3V at 3.3A, or 15.0V at 3.0A, or 9.0V at 3.0A, or 5.2V at 3.0A. Liteon Tech Corp. E132068.

The numbers

Rated67 W
Negotiated65.4 W (20 V up to 3.27 A)
Live draw62.5 W (19.7 V at 3.17 A)
ProtocolUSB PD 3.0

Profile menu: 15 W (5 V up to 3 A), 27 W (9 V up to 3 A), 45 W (15 V up to 3 A), 65.4 W (20 V up to 3.27 A).

A 5A cable requirement

The top 65.4 W profile negotiates at 3.27 A. Standard non-e-marked USB-C cables are hard-capped at exactly 3 A (which equals 60 W at 20 V).

Because this adapter’s top profile pushes just slightly past that limit at 3.27 A, it strictly requires a 5A (100W+) e-marked cable to negotiate its full advertised power. If you plug it in using a standard 3A cable, the charger will only advertise up to 60 W, and that’s all you’ll get.

Which cable: every test here uses the Anker 240W USB-C cable , 5A and EPR, so the cable is never the limit (on Amazon ). Apple’s own 240W Woven Charge Cable (2 m) does the same job.

67W USB-C Power Adapter. Designed by Apple in California, Assembled in China. Model A2518. TM and copyright 2021 Apple Inc.

Buying one

Apple has replaced the 67W adapter with the 70W. The Apple 70W USB-C Power Adapter negotiated 68 W on the same MacBook Air in our test , and it needs a 5A cable for the same reason.

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