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Black rectangular adapter with square slim-tip male plug and three USB ports

BONAEVER

BONAEVER USB-C to Square Slim-Tip Adapter 100W Black

SKU CH-R4P4-3C452

Converts legacy Square Slim-Tip chargers to USB-C with 100 W maximum output, three ports and USB-IF certified Power Delivery

  • Product typeAdapter
  • Product colorBlack
  • Reuse legacy Square Slim-Tip chargers with new USB-C devices up to 100W
  • Three output ports deliver USB-A 12W, USB-C 15W and 100W Type-C male simultaneously
  • USB-IF certified with Power Delivery auto-negotiation for safe voltage and current adaptation
  • Broad compatibility covers ThinkPad X1 Carbon, T440, T480, T490, Yoga 900 plus MacBook Pro, Dell XPS, Chromebook and more
  • Input power scales output: 60W source gives 60W max, 90W source gives 90W max

Legacy Square Tip to USB-C Bridge

This adapter lets owners of legacy Lenovo square slim-tip chargers power modern USB-C laptops, tablets and phones. It accepts the rectangular tip from older ThinkPad bricks and presents a USB-C male plug plus two additional USB-A ports and a USB-C female port for simultaneous charging.

Sustained Output Matches Brick Rating

The converter passes through whatever the connected legacy supply can deliver, up to a ceiling of 100 W. A 60 W brick therefore tops out at 60 W, a 90 W brick at 90 W, and only a 100 W or higher source reaches the rated maximum. The two USB-A ports share 12 W and the extra USB-C female port supplies 15 W, so multi-device loads stay within the brick's continuous capability rather than spiking above it.

Replaces Dedicated USB-C Chargers for ThinkPad Users

It removes the need to buy new USB-C power supplies when migrating from ThinkPad X1 Carbon, T440, T480, T490 or Yoga 900 models to newer USB-C hardware. The jump is worthwhile when the existing square-tip brick is still functional and its wattage meets the new device's requirement; it is not suited for users who have already discarded their legacy adapters or who need more power than their old brick can provide.

How it compares

Measured against everything we stock in Charging Stations & Cables, at today’s prices. Recalculated every night.

Price $14.99
Cheaper than about 70% of the 9,983 comparable items (median $18.99).

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Specifications

Product
Product typeAdapter
Product colorBlack

Questions about this item

Does the adapter itself generate noticeable heat or noise when passing 100W continuously?

The adapter has no fan or moving parts, so it runs silently; any warmth will depend on the charger you connect and the load drawn by your device.

Which legacy charger must I already own for this converter to function?

You need a Lenovo Square Slim-Tip charger — 60W or 90W models work, and the adapter will pass through up to that charger's rated output.

Will my older 60W or 90W Square Slim-Tip power brick still charge a modern USB-C laptop through this adapter?

Yes, the adapter negotiates USB-PD with the laptop and delivers up to the brick's original 60W or 90W limit, so older ThinkPad chargers remain useful.

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