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Black rectangular 135W 20V AC adapter with 7.9 by 5.5mm connector and power cord

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E-buy 135W 20V AC Adapter 45N0057 laptop charger

SKU CH-6NR2-NKYFT

A 135 W, 20 V AC adapter with 7.9 mm × 5.5 mm connector for ThinkPad T520, W510 and Series 3 docks

  • AC Adapter Voltage20V 135w
  • AC Adapter Current6.75A
  • Delivers 135 W at 20 V for demanding ThinkPad workloads
  • 75 A output current supports full performance on compatible models
  • 100–240 V 50/60 Hz input works worldwide without a voltage converter
  • 9 × 5.5 mm barrel connector matches listed ThinkPad and dock part numbers
  • Genuine Lenovo part 45N0057 replaces 945315659 for T520, W510 and Series 3 docks

Replacement 135 W 20 V adapter for ThinkPad docks

This genuine Lenovo AC adapter delivers 20 V at 6.75 A for 135 W total output. It matches part number 45N0057 and ships with a standard power cord. The barrel connector measures 7.9 mm by 5.5 mm and the housing is black. Input range covers 100 V to 240 V at 50 Hz to 60 Hz.

Upgrade from 90 W units when using Mini Dock

The 135 W rating replaces the 90 W adapter supplied with Mini Dock Series 3 (type 433710U) and is required for Mini Dock Plus Series 3 (type 433810U). It also powers ThinkPad T520 and W510 systems through their dock connectors. The jump is worth it when the dock or laptop draws more than 90 W under load.

Verify part number 45N0057 on the IBM website

ThinkPad W520 requires the 170 W adapter instead and will not operate correctly with this unit. Confirm the barrel dimensions 7.9 mm by 5.5 mm match the port on your dock or laptop. Ensure the device you are powering is listed among the compatible models: T520, W510, Port Replicator Series 3 (type 433610U), Mini Dock Series 3 or Mini Dock Plus Series 3.

Highlights

  • Delivers 135 W at 20 V for demanding ThinkPad workloads
  • 75 A output current supports full performance on compatible models
  • 100–240 V 50/60 Hz input works worldwide without a voltage converter
  • 9 × 5.5 mm barrel connector matches listed ThinkPad and dock part numbers
  • Genuine Lenovo part 45N0057 replaces 945315659 for T520, W510 and Series 3 docks

Specifications

AC Adapter Voltage20V 135w
AC Adapter Current6.75A

Questions about this item

Does the 7.9 mm by 5.5 mm barrel connector fit my ThinkPad T520 or W510?

The adapter uses a 7.9 * 5.5 mm barrel connector that matches the DC-in jack on all ThinkPad T520 and W510 models listed for part number 45N0057.

What is the correct order to connect the 100-240 V input cable and the 20 V output plug?

Plug the supplied AC power cord into the adapter brick first, then into the wall outlet, and finally insert the 20 V barrel tip into the laptop.

Will the 135 W unit also power a ThinkPad Mini Dock Plus Series 3 rated for 135 W?

Yes, the 135 W 20 V 6.75 A output meets the power requirement for the ThinkPad Mini Dock Plus Series 3 (type 433810U) listed in the compatibility table.

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