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Black rectangular 170W AC adapter with slim tip connector

Lenovo

Lenovo 4X20E50574 170W 20V AC Adapter Slim Tip

SKU CH-FH76-JSK6X MPN 4X20E50574

Delivers 170W at 20V with a slim tip connector for compatible ThinkPad laptops

  • Power adapter voltage20 V
  • Power adapter current2.5A
  • Power adapter wattage170 W
  • MeasurementsApproximate: 1.18 in × 2.99 in × 6.1 in
  • Product colorBlack
  • Product typeAC Adapter
  • Delivers 170W to run and charge simultaneously
  • 20V 2.5A output matches original adapter specs
  • Slim-tip rectangular plug fits compatible ThinkPad models
  • Compact 1.18 x 2.99 x 6.10 inch form
  • Weighs 1.32 lbs for easy portability

Compatible ThinkPad models

This 170W AC adapter fits ThinkPad notebooks that use the rectangular slim tip power plug. It delivers 20V at 2.5A and matches the specifications of the standard adapter shipped with supported systems. The unit is Energy Star V (ES 2.0) compliant and finished in black.

Replaces original or lost charger

Use it to replace a missing or damaged factory adapter for compatible ThinkPad W540 and other slim tip models. The jump is worth it when you need a spare for travel, a second unit for a docking setup, or a direct replacement that performs to the same 170W output specification.

Check your laptop power port

Before ordering, confirm that your ThinkPad uses the rectangular slim tip connector and not the round barrel type plug. This adapter is not compatible with barrel plug models. Verify the required 20V input and 170W rating match your device specifications.

How it compares

Measured against everything we stock in Laptop Chargers & Batteries, at today’s prices. Recalculated every night.

Price $98.99
Pricier than about 90% of the 27,790 comparable items (median $30.99).

Specifications

Product
Brand nameThinkPad
Model name4 × 20E50574
Product colorBlack
Product typeAC Adapter
Power
Power adapter voltage20 V
Power adapter current2.5A
Power adapter wattage170 W
Size & build
MeasurementsApproximate: 1.18 in × 2.99 in × 6.1 in
Product weight1.32 lb (0.6 kg)
Shipping weight1.36 kg
Package size257 × 157 × 81 mm

Questions about this item

What are the exact dimensions of the 4X20E50574 adapter so I can check if it fits my travel bag?

The adapter measures approximately 1.18 inches high, 2.99 inches wide and 6.10 inches deep, weighing 1.32 lbs.

How do I correctly connect the 170W 20V adapter to my ThinkPad W540, and what common mistake should I avoid?

Plug the rectangular slim tip firmly into the laptop's power port until it clicks; the common error is forcing a round barrel tip into the slim tip socket, which this adapter does not support.

When will the AC adapter or its detachable power cord typically need replacement?

The adapter is rated Energy Star V (ES 2.0) for efficiency; replace the unit if the slim tip becomes loose, the cable frays near the connector, or the brick no longer delivers 20V at 2.5A.

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