Power Connector

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Over time, different ThinkPads have used different power connectors. You can use a higher Amperage rated power supply then your ThinkPad needs, as long as the physical connector is correct. But you should not use a lower Amperage power supply on a ThinkPad needing more Amperage. Doing so will overheat the power supply, and might cause issues such as screen flicker.

In case you cannot find your Model ThinkPad listed, or you wish to double check, you can find the required power information on a label on the bottom of your ThinkPad
The Amperage's listed below are the OUTPUT values for the AC adapter, which should be equal or greater then what your ThinkPad requires

All current Thinkpads require 20 Volt DC input. See also the official Lenovo page for power adapters.

10.5 V, 1.0 A Power

15 V, 2.0 A Power

6.3 mm outer, 3.0 mm inner diameter.
Help needed
Will someone with an actual unit in-hand, please confirm the size?

4-Pin connector

4 pin power connector

Unknown watts/amps


AC Adapter PN 76H0119



20 V 2.5 A


AC Adapter PN 12J2456

16 Volt 4-Pin Power Mini-Din connector

120W power plug

120W 7.5 Amps

ThinkPad 120W AC Adapter (Support Website)
AC Adapter FRU PN 92P1035
AC Adapter Ouput: 7.5A, 16V

16 Volt Coax connector

16V coax connector

This is a 2.5/5.5mm barrel connector

35W 2.2 Amps

54W 3.36 Amps

Some of them have been recalled: part 02K6549 (FRU 02K6550), with three hollow pins. (CPSC recall) (Lenovo document) See the page Damage in 56W AC-Adapter, plastic housing melted.

56W 3.5 Amps

AC Adapter FRU PN 02K6810, 02K6816

72W 4.5 Amps

AC Adapter FRU PN 02K6744, 08K8202

19 Volt Coax connector

IBM called it "barrel connector, slim". 45W 2.4 Amps. 5.5 mm outer, 2.1 mm inner diameter. Option Marketing number 11J8702. See AC adapter matrix (Doc PD012162) as a source of information.

20 Volt Coax connector

big barrel

20V coax connector

7.5mm OD, 0.8mm diameter central pin

65W 3.25 Amps

AC Adapter FRU PN 92P1211
AC Adapter Output 3.25A, 20V

90W 4.5 Amps

AC Adapter FRU PN 92P1107

135W 6.75 Amps

AC Adapter PN 55Y9317

170W 8.5 Amps

AC Adapter PN 0A36227 (US) and PN 0A36231 (EU)

This AC adapter has the same diameter as the usual 20V AC adapters, but there is an extra plastic knob on one side of the connector. It is not round any more, that is, you can only plug it in one particular orientation. The extra knob prevents one from using the AC adapter on any other Thinkpads.

W700 Coax connector

6.0 mm outer, 3.0 mm inner diameter.
Help needed
Will someone with an actual unit in-hand, please confirm the size?

The W700/W700ds AC adapter plug has a different diameter than all other 20 Volt AC adapters. You cannot plug in a different AC adapter into a W700-series Thinkpad nor can you use the W700 AC adapter on a non-W700 Thinkpad.

170W 8.5 Amps for W700

AC Adapter PN 41R4421

230W 11.5 Amps

AC Adapter PN 55Y9333

Lenovo Slim Power (rectangle connector)

To celebrate ThinkPad 20 year anniversary, Lenovo introduced a new power connector in 2012. It is rectangular, close in size to USB A connector, and it has a signal pin in centre. A conversion cable for 20V barrel plugs exists (ASM 0A36037; FRU 03X6261).

  • OneLink connector
  • ThinkPad Ultra Dock
  • T440s

45W 2.25 Amps

  • IdeaPad Yoga 11
  • ThinkPad Helix
  • ThinkPad T431s
  • ThinkPad X240s

65W 3.25 Amps

  • IdeaPad Yoga 13
  • ThinkPad Edge E531

90W 4.5 Amps

  • ThinkPad X1 Carbon

135W 6.75 Amps

170W 8.5 Amps


The information found in this page is mostly correct, but may contain mistakes concerning legacy models.