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Compact black USB-C power adapter with detachable mains cord

DELL SM90CS-01 85W USB-C laptop charger

SKU CH-CQ7N-A0N0X

An 85 W USB-C charger for compatible Surface Pro models from 2024 and 2025

  • CompatibilityLaptops
  • Battery Voltage20V
  • AC Adapter Voltage20V
  • AC Adapter Current11.8A
  • AC Adapter Output Power85W
  • FeaturesFast Charging, USB Type C, Corded Electric, 0, type_a_2pin_n
  • 85W output powers demanding laptops quickly
  • USB-C connector fits modern Surface Pro models
  • 20V 11.8A delivery matches device requirements
  • Fast charging support reduces downtime
  • Built-in protections guard against over-voltage and short-circuits

DELL SM90CS-01 85W USB-C charger

The DELL SM90CS-01 is an 85W USB-C power adapter built for Microsoft Surface Pro models from 2024 and 2025. It suits professionals who need a reliable replacement or spare charger for daily office use and travel.

Practical limits of the USB-C standard

The adapter delivers up to 85W through a single USB-C connector with fixed output profiles of 5V 3A, 9V 3A, 12V 3A, 15V 3A, 18V 3A and 20V 3.25A. It will not charge devices that require higher voltages or proprietary barrel connectors, and it cannot power multiple devices simultaneously.

Installation and common issues

Plug the AC cord into a 100-240V 50-60Hz outlet and connect the USB-C tip to the Surface Pro; the charger negotiates voltage automatically. The unit is incompatible with Surface Pro 7 and earlier models, so buyers with older devices must select a different adapter.

Highlights

  • 85W output powers demanding laptops quickly
  • USB-C connector fits modern Surface Pro models
  • 20V 11.8A delivery matches device requirements
  • Fast charging support reduces downtime
  • Built-in protections guard against over-voltage and short-circuits

Specifications

BrandDELL
ModelSM90CS-01
CompatibilityLaptops
Battery Voltage20V
AC Adapter Voltage20V
AC Adapter Current11.8A
AC Adapter Output Power85W
FeaturesFast Charging, USB Type C, Corded Electric, 0, type_a_2pin_na, 120 volts, 2.25 amps

Questions about this item

Should I pick the 65 W or the 85 W version of this Dell charger?

The Dell SM90CS-01 is rated at 85 W output; the 65 W figure belongs to a different adapter listed in the supplier title.

What does the 85 W rating actually deliver to my Surface Pro?

It supplies up to 20 V at 11.8 A, giving the full 85 W the laptop can accept over USB-C.

Does the USB-C connector limit the power to 60 W or 65 W in practice?

No — the charger negotiates 20 V at 3.25 A (65 W) or 20 V at 11.8 A (85 W) depending on the device, so the USB-C port does not cap it below the rated output.

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