Chopmate 140W GaN USB-C AC adapter with 6.6ft cable

140W GaN USB-C adapter for Apple laptops

This 140W GaN power adapter ships with a 6.6ft USB-C to USB-C cable and targets owners of MacBook Pro 14-inch and 16-inch models from 2021 onward, plus MacBook Air 13-inch and 15-inch models from 2018 to 2023 and iPad Pro 11-inch and 12.9-inch tablets. The single USB-C port delivers up to 140W where the host device negotiates that level, while a built-in smart chip handles over-current, over-voltage, overload, temperature and short-circuit protection with auto-recovery.

Sustained 140W output with 99% efficiency

The adapter maintains a stable output current at its rated 140W, achieving a charging efficiency of up to 99% during continuous operation rather than only in short bursts. Thermal protection and the GaN topology keep temperatures in check so the unit can sustain high power through a full laptop charge cycle without throttling, and the 6.6ft cable adds placement flexibility on a desk or bedside table.

USB-C PD limits at 100W for most MacBooks

Although the brick is rated at 140W, the USB-C ports on MacBook Pro 14-inch and 16-inch models accept a maximum of 100W, while MacBook Air 13-inch and 15-inch models cap at 70W, so the extra headroom is only usable with devices that explicitly negotiate 140W over USB-C PD 3.1. Buyers who need the full 140W rate must use a Magnetic 3 cable and a compatible host; otherwise the adapter will fall back to the lower negotiated power level.