Power Port

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The power port is strictly used for charging and powering ThinkPads. Most newer ThinkPads do not use a dedicated power port, however. Instead, they use a USB Type-C port (24-pin) compliant with Power Delivery specifications for charging purposes.

Please note that not all power ports featured on ThinkPads are the same. Some of them are of the 'special' variety, which are not common and may be rare. For example, most IBM ThinkPads utilized the common 5.5 x 2.5 mm coaxial power connector. However, a few of them did not. One such example is the G40 and the G41, which used a Singatron 2MJ-3432-007 Mini-DIN-4 connector. In some cases, an adapter can be used to work-around with an incompatible power port.

Most importantly, not all power ports featured on ThinkPads use the same voltage as well. There are some models which employ odd voltages, due to their circuitry and/or design differences. Also, this voltage difference cannot be worked around with an adapter, as most adapters are generally passive which do not modify the output voltage to match the voltage required by the ThinkPad. It is highly recommended to either use the original AC adapter meant for the said ThinkPad, or use an AC adapter with the correct output voltage. Using an AC adapter with a higher output voltage may damage the ThinkPad's charging circuit or blow a fuse and render the entire machine unusable. On the other hand, using an AC adapter with a lower output voltage may cause instability.

As for amperage, this would be the least important. However, it is still recommended to use an AC adapter with an amperage that matches the ThinkPad's amperage. Otherwise, the AC adapter may overheat (due to its circuitry being overloaded) and/or cause the ThinkPad to charge slowly (due to insufficient power). If the said ThinkPad is solely running off the AC adapter as its main power source, it will become unstable and potentially unusable. Sometimes, the symptoms could be very severe to the point that the internal display panel would flicker, or the operating system would crash (due to incorrect calculations or unstable components).

Connectors and AC Adapters

Due to the potential crowding of connector sizes and AC adapter power ratings, the arrangement will be done in this format: [connector outer diameter] x [connector inner diameter] [measurement], [connector type]

Assume that the connector has no signal pin, unless noted.

11.0 x 4.5 mm, rectangle with signal pin

20v-rectangle.jpg
Remark: This connector is common. Some NEC AC adapters make use of them, mostly the modern NEC AC adapters. Dimensions are unconfirmed.

AC Adapters featuring this connector

Signal Pin Definitions

Wattage Resistance
230 W 4,600 Ω
170 W 1,900 Ω
135 W 1,000 Ω
90 W 550 Ω
65 W 280 Ω
45 W 120 Ω
36 W 7,300 Ω

5.5 x 2.1 mm, semi-hexagon 4-pin

4pin-power-plug.JPG
Remark: This connector is uncommon, but adapters do exist for this connector. Dimensions are unconfirmed.

AC Adapters featuring this connector

Singatron 2MJ-3432-007, Mini-DIN-4

120w-plug.jpg
Remark: This connector is uncommon, but adapters do exist for this connector.

AC Adapters featuring this connector

7.5 x 5.55 mm, coaxial with 0.8 mm signal pin

20v-barrel.jpg 20v-barrel-hd.jpg
Remark: This connector is very common. Adapters are easy to locate, although their tips may be colored differently.
Be careful of this connector's 2nd variant (right image), which has two plastic tabs that disallows insertion in models that are not rated for 170 W. You could dremel or pry the plastic tabs off using a flathead screwdriver, however.

AC Adapters featuring this connector

Signal Pin Definitions

Wattage Resistance
170 W 1,500 Ω
135 W 0 Ω
90 W Not Connected
65 W 10,000 Ω

6.3 x 4.0 mm, coaxial

W70x-barrel.jpg
Remark: This connector is uncommon, but adapters do exist for this connector.

AC Adapters featuring this connector

6.3 x 3.6 mm, coaxial

18V-barrel.jpg
Remark: This connector is uncommon, so adapters may be difficult to locate.

AC Adapters featuring this connector

6.3 x 3.0 mm, coaxial

15V-barrel.jpg
Remark: This connector is common. Some Toshiba AC adapters make use of them, most particularly the Toshiba 15 VDC AC adapters.

AC Adapters featuring this connector

5.5 x 2.5 mm, coaxial

16v-barrel.jpg
Remark: This connector is very common. Adapters are easy to locate, although their tips may be colored differently.

AC Adapters featuring this connector

5.5 x 2.1 mm, coaxial

19v-barrel.png
Remark: This connector is uncommon, but adapters do exist for this connector.

AC Adapters featuring this connector

Compatibility

Models Voltage Amperage Connector Compatible
AC Adapter(s)
Recommended
AC Adapter(s)
Notes/Exceptions
130 16 V, DC 3.36 A, DC 5.5 x 2.5 mm, coaxial IBM 16V 35W AC Adapter IBM 16V 72W AC Adapter
IBM 16V 56W AC Adapter
IBM 16V 54W AC Adapter
N/A
220 10.5 V, DC 1 A, DC 5.5 x 2.1 mm, coaxial IBM 10.5V 11W AC Adapter IBM 10.5V 11W AC Adapter N/A
230CS 16.5 V, DC 1.4 A, DC 5.5 x 2.1 mm, semi-hexagon 4-pin IBM 16.5V 23W AC Adapter IBM 16.5V 23W AC Adapter N/A
235, 240, 240X
240Z, i Series 1124
16 V, DC 3.36 A, DC 5.5 x 2.5 mm, coaxial IBM 16V 35W AC Adapter IBM 16V 72W AC Adapter
IBM 16V 56W AC Adapter
IBM 16V 54W AC Adapter
N/A
i Series 1200, i Series 1210
i Series 1230, i Series 1250
i Series 1260, i Series 1300
i Series 1330, i Series 1370
i Series 1400, i Series 1410
i Series 1411, i Series 1412
i Series 1420, i Series 1421
i Series 1422, i Series 1441
i Series 1442, i Series 1450
i Series 1451, i Series 1452
i Series 1460, i Series 1472
i Series 1480, i Series 1482
i Series 1483, i Series 1492
i Series 1500, i Series 1512
i Series 1540, i Series 1541
i Series 1542, i Series 1552
i Series 1560, i Series 1562
i Series 1592
16 V, DC 3.5 A, DC 5.5 x 2.5 mm, coaxial IBM 16V 54W AC Adapter
IBM 16V 35W AC Adapter
IBM 16V 72W AC Adapter
IBM 16V 56W AC Adapter
N/A
Template:P70, Template:P71
Template:P72, Template:P73
Template:P50, Template:P51
Template:P52, Template:P53
20 V, DC 11.5 A, DC 11.0 x 4.5 mm, rectangle with signal pin Lenovo 20V 170W AC Adapter
Lenovo 20V 135W AC Adapter
Lenovo 20V 90W AC Adapter
Lenovo 20V 65W AC Adapter
Lenovo 20V 45W AC Adapter
Lenovo 20V 230W AC Adapter High-end configs require 230 W.
W510 20 V, DC 6.75 A, DC 7.5 x 5.55 mm, coaxial with 0.8 mm signal pin Lenovo 20V 90W AC Adapter
Lenovo 20V 65W AC Adapter
Lenovo 20V 170W AC Adapter
Lenovo 20V 135W AC Adapter
N/A
W520, W530 20 V, DC 8.5 A, DC 7.5 x 5.55 mm, coaxial with 0.8 mm signal pin Lenovo 20V 135W AC Adapter
Lenovo 20V 90W AC Adapter
Lenovo 20V 65W AC Adapter
Lenovo 20V 170W AC Adapter N/A
W540, W541 20 V, DC 8.5 A, DC 11.0 x 4.5 mm, rectangle with signal pin Lenovo 20V 135W AC Adapter
Lenovo 20V 90W AC Adapter
Lenovo 20V 65W AC Adapter
Lenovo 20V 45W AC Adapter
Lenovo 20V 230W AC Adapter
Lenovo 20V 170W AC Adapter
N/A
W700, W700ds
W701, W701ds
20 V, DC 11.5 A, DC 6.3 x 4.0 mm, coaxial Lenovo 20V 170W AC Adapter Lenovo 20V 230W AC Adapter High-end configs require 230 W.
A20m, A20p, A21e
A21m, A21p, A22e
A22m, A22p, A30
A30p, A31, A31p
i Series 1800
16 V, DC 4.5 A, DC 5.5 x 2.5 mm, coaxial IBM 16V 56W AC Adapter
IBM 16V 54W AC Adapter
IBM 16V 35W AC Adapter
IBM 16V 72W AC Adapter N/A
T20, T21, T22
T23, T30, T40
T40p, T41, T41p
T42, T42p, T43
T43p
16 V, DC 4.5 A, DC 5.5 x 2.5 mm, coaxial IBM 16V 56W AC Adapter
IBM 16V 54W AC Adapter
IBM 16V 35W AC Adapter
IBM 16V 72W AC Adapter N/A
T60, T60p, T61
T61p, T400, T400s
T410, T410i, T410s
T410si, T420, T420i
T420s, T420si, T430
T430i, T430s, T430si
T430u, T500, T510
T510i, T520, T520i
T530, T530i
20 V, DC 6.75 A, DC 7.5 x 5.55 mm, coaxial with 0.8 mm signal pin Lenovo 20V 90W AC Adapter
Lenovo 20V 65W AC Adapter
Lenovo 20V 170W AC Adapter
Lenovo 20V 135W AC Adapter
Intel GPU configs require 65 W.
ATI/AMD/NVIDIA GPU configs require 90 W.
Quad-core CPU configs require 135 W.
W550s, Template:P50s
Template:P51s
A275, A475
T431s, T440, T440s
T440p, T450, T450s
T460, T460s, T460p
T470, T470s, T470p
T540p, T550, T560
T570, 25
20 V, DC 6.75 A, DC 11.0 x 4.5 mm, rectangle with signal pin Lenovo 20V 90W AC Adapter
Lenovo 20V 65W AC Adapter
Lenovo 20V 45W AC Adapter
Lenovo 20V 230W AC Adapter
Lenovo 20V 170W AC Adapter
Lenovo 20V 135W AC Adapter
Intel GPU configs require 45 W.
AMD/NVIDIA GPU configs require 65 W.
Quad-core CPU configs require 135 W.
X20, X21, X22
X23, X24, X30
X31, X32, X40
X41, X41 Tablet, i Series 1620
TransNote
16 V, DC 3.5 A, DC 5.5 x 2.5 mm, coaxial IBM 16V 54W AC Adapter
IBM 16V 35W AC Adapter
IBM 16V 72W AC Adapter
IBM 16V 56W AC Adapter
N/A
X60, X60s, X60 Tablet
X61, X61s, X61Ls
X61 Tablet, X100e, X120e
X121e, X130e, X131e
X140e, X200, X200s
X200 Tablet, X201, X201i
X201s, X201si, X201 Tablet
X201i Tablet, X220, X220i
X220 Tablet, X220i Tablet
X230, X230i, X230 Tablet
X230i Tablet, X300, X301
X1, X1 Hybrid, Template:Mini 10
20 V, DC 3.25 A, DC 7.5 x 5.55 mm, coaxial with 0.8 mm signal pin N/A Lenovo 20V 170W AC Adapter
Lenovo 20V 135W AC Adapter
Lenovo 20V 90W AC Adapter
Lenovo 20V 65W AC Adapter
N/A
L410, L412, L420
L421, L430, L510
L512, L520, L530
20 V, DC 4.5 A, DC 7.5 x 5.55 mm, coaxial with 0.8 mm signal pin Lenovo 20V 65W AC Adapter Lenovo 20V 170W AC Adapter
Lenovo 20V 135W AC Adapter
Lenovo 20V 90W AC Adapter
Intel GPU configs require 65 W.
ATI/AMD/NVIDIA GPU configs require 90 W.
SL300, SL400, SL400c
SL410, SL410k, SL500
SL500c, SL510, SL510k
20 V, DC 4.5 A, DC 7.5 x 5.55 mm, coaxial with 0.8 mm signal pin Lenovo 20V 65W AC Adapter Lenovo 20V 170W AC Adapter
Lenovo 20V 135W AC Adapter
Lenovo 20V 90W AC Adapter
Intel GPU configs require 65 W.
ATI/NVIDIA GPU configs require 90 W.
R30, R31, R32
R40, R40e, R50
R50e, R50p, R51
R51e, R52
16 V, DC 4.5 A, DC 5.5 x 2.5 mm, coaxial IBM 16V 56W AC Adapter
IBM 16V 54W AC Adapter
IBM 16V 35W AC Adapter
IBM 16V 72W AC Adapter N/A
R60, R60e, R60i
R61, R61e, R61i
R400, R500
20 V, DC 4.5 A, DC 7.5 x 5.55 mm, coaxial with 0.8 mm signal pin Lenovo 20V 65W AC Adapter Lenovo 20V 170W AC Adapter
Lenovo 20V 135W AC Adapter
Lenovo 20V 90W AC Adapter
Intel GPU configs require 65 W.
ATI/NVIDIA GPU configs require 90 W.
G40, G41 16 V, DC 7.5 A, DC Singatron 2MJ-3432-007, Mini-DIN-4 N/A IBM 16V 120W AC Adapter N/A
G50 20 V, DC 3.25 A, DC 7.5 x 5.55 mm, coaxial with 0.8 mm signal pin N/A Lenovo 20V 170W AC Adapter
Lenovo 20V 135W AC Adapter
Lenovo 20V 90W AC Adapter
Lenovo 20V 65W AC Adapter
N/A
Edge 11", Edge 13, Edge 14"
Edge 15", Edge L330, Edge S430
Edge E120, Edge E125, Edge E130
Edge E135, Edge E145, Edge E220s
Edge E320, Edge E325, Edge E330
Edge E335, Edge E420, Edge E420s
Edge E425, Edge E430, Edge E430c
Edge E435, Edge E520, Edge E525
Edge E530, Edge E530c, Edge E535
20 V, DC 4.5 A, DC 7.5 x 5.55 mm, coaxial with 0.8 mm signal pin Lenovo 20V 65W AC Adapter Lenovo 20V 170W AC Adapter
Lenovo 20V 135W AC Adapter
Lenovo 20V 90W AC Adapter
Intel GPU configs require 65 W.
ATI/AMD/NVIDIA GPU configs require 90 W.
S30, S31 16 V, DC 3.5 A, DC 5.5 x 2.5 mm, coaxial IBM 16V 54W AC Adapter
IBM 16V 35W AC Adapter
IBM 16V 72W AC Adapter
IBM 16V 56W AC Adapter
N/A
Z60m, Z60t, Z61e
Z61m, Z61p, Z61t
20 V, DC 4.5 A, DC 7.5 x 5.55 mm, coaxial with 0.8 mm signal pin Lenovo 20V 65W AC Adapter Lenovo 20V 170W AC Adapter
Lenovo 20V 135W AC Adapter
Lenovo 20V 90W AC Adapter
Intel GPU configs require 65 W.
ATI GPU configs require 90 W.