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Black rectangular Lenovo 90W laptop AC adapter with attached power cord

Lenovo

Lenovo 90W AC Adapter 20V 4.5A 42T4438 42T4426

SKU CH-ZFDH-WSY95

A 90 W replacement power supply delivering 20 V at 4.5 A for compatible ThinkPad models, bundled with a mains cord and built-in over-voltage, short-circuit and over-temperature protection

  • TypeCharger
  • Delivers 90 W output for fast charging
  • 20 V 4.5 A matches ThinkPad power requirements
  • 100-240 V 50/60 Hz input works worldwide
  • Overvoltage short-circuit and over-temperature protection safeguards hardware
  • Fireproof PCB and cover with low ripple noise

Lenovo 90W AC Adapter for ThinkPad

This 90W AC adapter supplies 20V at 4.5A to compatible Lenovo ThinkPad laptops. It replaces part numbers 42T4438 and 42T4426. The unit includes the power brick and detachable mains cord. It is intended for users who need a direct replacement charger for supported models.

Installation and common issues

Connect the DC plug to the laptop and the mains cord to a wall socket; the wide 100-240V input handles global voltages automatically. Built-in overvoltage, short-circuit and over-temperature protection reduce risk of damage. The fireproof PCB cover and low ripple design help maintain stable output. Ensure the connector seats fully to avoid intermittent charging.

Compatibility checklist

Verify that your ThinkPad requires a 20V 4.5A 90W supply and uses the same barrel connector as the original 42T4438 or 42T4426 unit. Check the laptop's service manual or original charger label for the exact voltage and current rating. Confirm the mains cord plug type matches your local socket standard before ordering.

Highlights

  • Delivers 90 W output for fast charging
  • 20 V 4.5 A matches ThinkPad power requirements
  • 100-240 V 50/60 Hz input works worldwide
  • Overvoltage short-circuit and over-temperature protection safeguards hardware
  • Fireproof PCB and cover with low ripple noise

Specifications

TypeCharger

Questions about this item

How do I confirm the 90W adapter is delivering 20V 4.5A after setup?

Measure the output with a multimeter set to DC volts; a reading near 20 V under load shows the unit is working as intended.

What comes in the box and what must I buy separately?

The package includes the 90W AC adapter and a detachable mains power cord; no extra cables are required for supported ThinkPad models.

Which part number should I choose between 42T4438 and 42T4426?

Both part numbers refer to the same 20 V 4.5 A 90 W adapter, so either one will suit compatible ThinkPad models.

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