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 Lenovo Alias ID: AC-ADAPTERS, Document ID: PD014168, Last Updated :02 Sep 2016. (Was IBM Doc MIGR-4tcmcu.)

6.3 mm outer, 3.0 mm inner diameter

Help needed
Will someone with an actual unit in-hand, please confirm the size?

Some models use 15 V, 2.0 A Power.

  • ThinkPad 350, 350C (Type 2618) rated 15 V ⎓ 1.9 A 28.5 W.
  • ThinkPad 510CS
  • ThinkPad 500 (MTM 2603-08N) rated 10.8 V ⎓ 1.7 A, 18.36 W. Seems to work with FRU 59G7991 16.3v/1.84a.
  • ThinkPad 700T (MTM 2521-002) rated 15V ⎓ 1.7A, 25W.
  • 730T, 730TE rated 15 VDC, 1.3 A, part 66G9523, FRU 99G0505, reference on ps-2.kev0009.com; another FRU seems to be 84G0505 made in Japan by Panasonic. In twbook.pdf, "AC Adapter 20 watts 84G0480".

6.3 mm outer, 3.6 mm inner diameter

power barrel plug for ThinkPad 340

The connector is inner 3,6 mm. outer 6,3 mm.

AC Adapter

  • P/N 84G6612; FRU P/N 84G6679; rated output 18V 0.83A; UL file number E133304 NAGANO JAPAN RADIO CO LTD.
  • P/N 84G6754, FRU 39H2425, rated 18V, 0.83A.

4-Pin hexagon

This information is incomplete and not entirely correct.
add pinout

The information found in this page is mostly correct. But the four-pin connector, in particular, is not thoroughly understood. This connector is discussed on forum.thinkpads.com, "Correct type of power supply for 360Cs".

4 pin power connector

A makeshift replacement connector

As these 4-pin PSUs are getting more rare and more expensive, a cheap solution if you don't have one is to adapt a universal 19-20V laptop PSU with a barrel connector. This isn't ideal if you're relying on the Thinkpad for some critical old business application, but it's fine if you're just a tinkerer playing with an old one off eBay for example.

Only the "+" and "-" connections (top-right and bottom-right looking into the connector on the back of the laptop from the back of the laptop) are required for basic operation, so that's all you need to adapt. Get an extension lead for your barrel connector - e.g. 2.1mm - and cut it in half. Discard the plug half. Get a "Mini JST" plug with flying leads, commonly used to power model helicopters etc. This is the plug that I've found will fit over the + and - pins. Wire the two together so that the red wire on the Mini JST is soldered to the centre contact wire on the barrel connector extension (socket half).

ALWAYS double check the polarity when plugging in your custom modded connector, since it's possible to get it the wrong way round.--Cloudane

plug converter for universal power adapter

convertor from barrel to 4pin hexagon plug

An aftermarket plug converter is available, alone and in a set, which fits IBM's hexagonal inlet. It is meant to be used with an Universal AC Adapter (of cheap China Special variety). It is not safe to use. In this converter, both G and - are wired to the outer shell of the barrel connector, and both S and + are wired to the centre pin of the barrel connector. In some ThinkPads (specifically 760E), S and - pins are connected to each other. This plug will make a short circuit in such a ThinkPad.

kishy wrote on forum.thinkpads.com:
Internal to the ebay DC port adapter, the (G) and (-) terminals have continuity, and the (S) and (+) terminals have continuity. Therefore, if you connect the ebay port adapter to the laptop, you are shorting positive to negative.

Tested by kishy on forum.thinkpads.com.

Models using this connector

20 volt

  • ThinkPad 360P (MTM 2620-50D rated 20V ⎓ 2.50A on machine label, 30 watts in twbook.pdf)
  • ThinkPad 360PE (MTM 2620-B0G rated 20V ⎓ 2.50A on machine label, 35 watts in twbook.pdf)
  • ThinkPad 750P (MTM 9545-40E rated 20V ⎓ 2.50A on machine label)
  • ThinkPad 755CD (MTM 9545-FBX rated 20V ⎓ 2.50A on machine label, 35 watts in twbook.pdf)
  • ThinkPad 760ED (MTM 9546-U3A and 9546-U9A rated 20V ⎓ 2.50A on machine label, 35 watts in twbook.pdf)
  • ThinkPad 760XL (MTM 9547-U9C rated 20V ⎓ 2.50A on machine label, 35 watts in twbook.pdf)
  • Power Series 800 (MTM 6020-960 rated 20V ⎓ 2.50A on machine label)
  • Power Series ThinkPad 850 (MTM 7249 rated 20V ⎓ 2.50A on machine label)

Unknown specifics

30 watts in twbook.pdf

35 watts in twbook.pdf

AC Adapter PN 76H0119

40 watts in twbook.pdf

56 watts in twbook.pdf



AC Adapter

  • P/N 02K7014; FRU P/N 02K7015; OUTPUT 16V ⎓ 2.2A
  • P/N 49G2192; FRU P/N 49G2196; INPUT 100-240V ⏦ 0.95-0.5A 50/60Hz; OUTPUT 20-10V ⎓ 2.00-3.38A
    • UL File Number E123155 : (LABEL? ASM?) P/N 49G2194
    • UL File Number E133304 : (LABEL? ASM?) P/N 53G7806
  • P/N 85G6704; FRU P/N 85G6705; OUTPUT 16V ⎓ 2.2A
  • P/N 85G6733; FRU P/N 85G6735; INPUT 100-240V ⏦ 1.0A-0.55A 50-60Hz; OUTPUT 16V ⎓ 2.2A; no S pin
  • P/N 09J4298; FRU P/N 09J4303; 20V ⎓ 3A
  • In twbook.pdf "56 watt AC Adapter (4 pin; 3 prong) 12J2456".
  • In twbook.pdf "Options for ThinkPad Power Series: AC Adapter 50 watts 30H1403".
  • AC Adapter-30 : LABEL P/N 84G2128; P/N 84G2098; FRU P/N 84G2277; INPUT 100-120V ⏦ 0.85-0.75A 50/60Hz; OUTPUT 20-10V ⎓ 1.5-3.0A

4-pin circle

This connector resembles, but is slightly larger, than Mini-Din. This connector resembles "snap and lock" DC power 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

5.5 mm outer, 2.5 mm inner diameter

16V coax connector

This is a 2.5/5.5mm barrel coax connector, delivering 16 volts. Four AC adapters are commonly available: 35W (16V 2.2 Amps), 54W (16V 3.36 Amps), 56W (16V 3.5 Amps), 72W (16V 4.5 Amps). Some of the 3.36A adapters have been recalled: see the page Damage in 56W AC-Adapter, plastic housing melted.

  • ThinkPad 560, 560E (rated 1.9A)
  • ThinkPad 560X, 560Z (rated 35W 2.2 Amps)
  • ThinkPad 570, 570E (rated 54W 3.36 Amps)

  • ThinkPad 600 (rated 2.6A), ThinkPad 600E (rated 2.6A)
  • ThinkPad 600X (rated 3.0A)

  • ThinkPad iSeries S30 (rated 54W 3.36 amp)

56W 3.5 Amps

Help needed
not entirely correct, needs confirmation

barrel connector, slim

19 Volt Coax connector
IBM called it "barrel connector, slim". 19 V, 45 W 2.4 A. 5.5 mm outer, 2.1 mm inner diameter. Option Marketing number 11J8702. See AC adapter matrix (Doc PD012162) as a source of information.

big barrel "advanced" connector

20V coax connector

20 Volt Coax. 7.5mm OD, 5.55mm ID, 0.8mm diameter central pin.

Signal Pin

Power controller subsystem senses when power is connected, and measures resistance between central signal pin and ground. Firmware policy might reduce performance (battery charges slowly, processors throttle to low speed) if an insufficient supply is detected. This issue is discussed at forum.thinkpads.com, "W520 requires 170W AC adapter".

power rating resistance
65 W 10 kΩ
90 W not connected
135 W 0 Ω
170 W 1.5 kΩ

Models using this connector

65W 3.25 Amps

AC Adapter Output 3.25A, 20V

90W 4.5 Amps

135W 6.75 Amps

AC Adapter PN 55Y9317

W520 W530 variant

170W 8.5 Amps

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

The size of this connector is same as on usual 20V AC adapters, but inner detail is different. Inside this connector is not round any more: it has two symmetric plastic knobs. A user can only plug it in two particular orientations. The extra knobs prevent one from using the AC adapter with any other Thinkpads.

How to use 170W powersupplies with other Models

jcvjcvjcvjcv wrote on forum.thinkpads.com:
I stripped the unwanted plastic from the power connector of a 170W adapter using a security Torx #30 bit. That size fits perfectly and just takes out the plastic you don't need and leaves everything else (including the center pin) untouched.

Tip by jcvjcvjcvjcv on forum.thinkpads.com.

slim plug

This connector is used in power accessories, not in any Think system. It is found in 90W Slim AC/DC Combo Adapter (which won a Good Design Award ) and later 90W Ultraslim AC/DC Combo Adapter.

slim power tips

W700 Coax connector

⌀ 6.3 mm outer, ~4 mm inner diameter. 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. This coaxial (barrel) connector does not have a discrete signal contact.

170W 8.5 Amps for W700

AC Adapter PN 41R4421

230W 11.5 Amps

AC Adapter PN 55Y9333

slim tip

20V coax rectangle and barrel connectors
Lenovo wrote on store product description:
New rectangular fixed “slim tip” plug to support thin and light hardware designs

Lenovo introduced a new power connector in 2012. This connector is standard in all new models since late 2013 product line. It is rectangular, close in size to USB A connector, and it has a signal pin in centre. For fondleslabs, slimtangle plug delivers at 12 volts. Notebook-laptop ThinkPads use 20 volt power still since 2005.

Signal Pin

power rating resistance
36 W 7,3 kΩ
45 W 120 Ω
65 W 280 Ω
90 W 550 Ω
135 W 1 kΩ
170 W 1.9 kΩ
230 W 4.6 kΩ

Models using this connector

  • A conversion cable for 20V barrel plugs exists: ThinkPad Slim Power Conversion Cable; Model L01DC001-NB-R; Option Marketing number 0B47046; ASM 0A36037; FRU 03X6261; UPC 887263167790; EAN 0887263167790; JAN 4560421046101. Amazon.com ASIN B00BOVO5GY.

36W 12 V ⎓ 3 A

45W 2.25 Amps

65W 3.25 Amps

90W 4.5 Amps

135W 6.75 Amps

170W 8.5 Amps


10.5 V, 1.0 A Power