Lenovo 90W AC Adapter for ThinkPad Edge, L-Series, R-Series (FRU 42T4429)

At a busy office desk, a ThinkPad Edge user plugs in the Lenovo 90W AC Adapter and immediately continues a video conference without battery anxiety. This genuine Lenovo power supply delivers 90 watts through a round barrel connector, matching the original equipment for many ThinkPad Edge, L-series, and R-series notebooks. Its compact black housing fits neatly into a laptop bag, while the included power cord connects to any standard wall outlet. Built for indoor use only, the adapter handles 100–240V input automatically, making it suitable for travel within different voltage regions. Overload, short circuit, and over voltage protection safeguard both the adapter and the connected laptop. The FRU part number 42T4429 identifies this unit as a field-replaceable component, ensuring exact compatibility with supported models. Users can rely on stable 20V DC output at 4.5A to power demanding applications, from spreadsheets to presentations. The adapter runs cool and quiet, with no fan noise, and its robust construction withstands daily plugging and unplugging. For IT departments, stocking this adapter reduces downtime caused by lost or failed power bricks. For individual users, it serves as a spare at home or a permanent replacement for a worn-out original. The black colour blends with most ThinkPad designs, and the cable length offers flexibility in arranging the workspace. No software or drivers are needed—simply connect and charge. This adapter is not a universal charger; it is engineered specifically for Lenovo ThinkPad models listed, ensuring the correct voltage and connector fit. Using a non-genuine adapter can risk damage, but this original Lenovo part provides peace of mind. The adapter is lightweight enough for daily carry yet solid enough for permanent desk use. It meets Lenovo's quality standards and is a direct replacement for the original part number 42T4429.

Key specifications

• Power output: 90 W
• Input voltage: 100–240 V AC, 50/60 Hz
• Output voltage: 20 V DC, 4.5 A
• Connector: Round barrel (7.9mm x 5.5mm with center pin)
• FRU part number: 42T4429
• Compatibility: ThinkPad Edge, L410, L412, L420, L421, L510, L512, L520, R60, R60e
• Protection: Overload, short circuit, over voltage
• Colour: Black
• Power cord included

Why choose it

This is a genuine Lenovo adapter, not a third-party imitation. It delivers the exact voltage and current your ThinkPad expects, preventing charging issues and potential damage. The wide input voltage range means you can use it in most countries without a voltage converter, only a plug adapter. Built-in safety features protect against power surges and faults. As an FRU part, it is the same component Lenovo technicians would install, ensuring full compatibility and reliability. The included power cord is ready to use out of the box. Its compact size and light weight make it easy to carry as a spare, and the black finish matches your laptop. With a 90W output, it can charge your laptop even while running intensive tasks, so you won't lose power during critical work.

Ideal use cases

• Replacing a lost or damaged original adapter for a ThinkPad Edge, L-series, or R-series laptop.
• Keeping a spare adapter at home or in the office for convenient charging without carrying the main one.
• Equipping a hot-desking environment where multiple users share compatible ThinkPad models.
• Traveling internationally, thanks to the 100–240V input that works with a simple plug adapter.
• Providing a reliable power source for IT support teams servicing ThinkPad fleets.

Good to know

This adapter is for indoor use only; do not expose it to moisture or extreme temperatures. The round barrel connector is specific to certain ThinkPad models—check your laptop's compatibility before ordering. The FRU number 42T4429 is printed on the adapter label for easy identification. The power cord is detachable and can be replaced with a country-specific cord if needed. No voltage selection switch is required; the adapter adjusts automatically. Always unplug the adapter when not in use for extended periods. The adapter may become warm during operation, which is normal. For safety, use only with compatible Lenovo laptops as listed. This product does not include a USB port or other connectors; it is a dedicated AC adapter.