Specifications

Overview

Full Specifications

Power Adapter

Brand	Lenovo (OEM) / Compatible Replacement
Output Voltage	20V DC
Output Current	4.5 Amps
Power Rating	90 Watts
Input Voltage	AC 100-240V, 50-60Hz (Worldwide)
Connector Size	7.9mm x 5.5mm (Big Pin)
Cable Length	Approx. 1.8m - 3.0m
Common PN	0B46994, 45N0237, ADLX90NDC3A, PA-1900-72
Warranty	1 Year Warranty

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Verified Info: High-power 90W delivery with yellow-tip barrel connector, optimized for ThinkPad series reliability.

Product Details

Product Overview

Lenovo 90W Adapter (20V, 4.5A) - Big Pin

Comprehensive Connector Identification & Compatibility Guide

LENOVO

The Lenovo 90W Adapter (20V, 4.5A) is a high-power power supply unit designed for larger and older Lenovo laptops that require more energy than the standard 65W charger can provide. Rated at 90 watts, it is essential for powering 15-inch and larger ThinkPads, mobile workstations, and some IdeaPad series without straining the adapter.

Connector Identification: "Big Pin" (7.9mm x 5.5mm)

The term "Big Pin" is critical for compatibility. Lenovo has historically used three main connector types for their 20V laptops. This adapter uses the largest of the three.

Lenovo Connector Comparison

Connector Type	Size	Tip Shape/Color	Typical Use
"Big Pin" (This Adapter)	7.9mm x 5.5mm	Rectangular / Yellow or Black Tip	Older ThinkPad T60/T61, R series, IdeaPad
"Slim Tip" (Round)	4.0mm x 1.7mm	Round / Yellow Tip	ThinkPad T440, T450, T540, X240, E series
"Slim Tip" (Square)	11mm x 4.5mm	Rectangular / USB-style	Newer ThinkPad (T460 and later)

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Important: The 7.9mm x 5.5mm "Big Pin" connector is physically larger and will NOT fit the smaller 4.0mm round "Slim Tip" port used on many newer Lenovo laptops. Always verify the physical connector size before purchasing.

Compatible Laptop Series

Series	Compatible Models
ThinkPad (T Series)	T60, T61, T500, T510, T520, R60, R61, R500, R510, R520
ThinkPad (W Series)	W500, W510, W520, W700, W701 (Mobile Workstations)
ThinkPad (Z Series)	Z60, Z61 Series
IdeaPad Series	Y510, Y530, Y550, Y560, Y570, Y580 (Gaming Series)
Lenovo 3000	N500, G530, G550, G560

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Buy Lenovo 20V 4.5A 90W Big Pin Adapter (7.9mm x 5.5mm rectangular connector) for ThinkPad T60/T61, IdeaPad Y series. Original and compatible replacements available.