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Black rectangular AC adapter with 5.5 mm barrel tip and three-prong power cord

Kastar

Kastar 90W AC Adapter 20V 4.5A 5.5mm Tip

SKU CH-2MYK-7JZMA

Delivers 90W at 20V 4.5A via a 5.5mm tip and includes a three-prong power cord

  • 90 W output powers compatible ThinkPad models
  • 20 V 4.5 A DC delivery matches original charger specs
  • 100-240 V AC input works worldwide on 50/60 Hz mains
  • 5 mm barrel tip fits listed Lenovo laptops
  • OVP OCP SCP protection guards against voltage current and short-circuit faults

Kastar 90W AC Adapter for ThinkPad

This Kastar 90W AC Adapter supplies 20V at 4.5A for compatible IBM and Lenovo ThinkPad models including T60, T61, X60, Z60, Z61, X61, R61, R60, X200, T400, T23, T30, T40, T41, 3000 and IdeaPad U110. It replaces part numbers 40Y7659 and 92P1109. The unit accepts 100-240V AC input at 1.6A 50/60Hz for worldwide use.

Installation and common issues

The 5.5mm internal diameter and 7.9mm external diameter barrel connector must match the laptop's DC jack exactly; a loose or tight fit prevents charging. Built-in OVP, OCP and SCP protections guard against voltage spikes, over-current and short circuits. The package includes a 3-prong extended power cord for immediate connection to a mains outlet.

Practical limits of the 90W brick

This adapter delivers a fixed 90W maximum output; systems that demand more power under load will not charge or may throttle. The 20V 4.5A rating is not adjustable, so it cannot serve devices requiring different voltages. The barrel connector standard limits compatibility to the listed ThinkPad series only.

Highlights

  • 90 W output powers compatible ThinkPad models
  • 20 V 4.5 A DC delivery matches original charger specs
  • 100-240 V AC input works worldwide on 50/60 Hz mains
  • 5 mm barrel tip fits listed Lenovo laptops
  • OVP OCP SCP protection guards against voltage current and short-circuit faults

Specifications

No published specifications for this item yet.

Questions about this item

How do I confirm the adapter is delivering 20V 4.5A after plugging it in?

The adapter includes OVP, OCP and SCP protection circuits; when connected the laptop should show charging and the green LED on the tip will remain steady, indicating the 20V 4.5A output is active.

Does the box contain both the power brick and a mains lead, or must I buy a cord separately?

The package includes the Kastar AC adapter and a 3-prong extended power cord, so no separate mains lead is required.

Which connector size matches my ThinkPad — 5.5 mm or 7.9 mm?

The DC plug has a 5.5 mm internal diameter and 7.9 mm external diameter, the standard tip for the listed ThinkPad models.

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