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Black square female to USB-C male adapter with slim tip input

BUCIER

BUCIER Square Female to USB-C Male PD 140W Adapter

SKU CH-QA4G-MN0KC

Converts a Lenovo square-tip power supply into a USB-C PD source delivering up to 140 W for phones, tablets and laptops

  • Thunderbolt 3 supportUSB
  • Units per package1
  • Product colorBlack
  • DetailsLenovo Thinkpad Laptop
  • Key featuresLaptop
  • Converts square-tip power bricks to USB-C charging
  • Supports Power Delivery up to 140 W output
  • Built-in PD chip auto-negotiates 5 V, 9 V or 20 V
  • Input 15 V–20.5 V matches Lenovo slim-tip adapters
  • Compact adapter replaces bulky charger for travel

Square female input for Lenovo ThinkPad power bricks

This adapter converts a Lenovo slim-tip square female connector into a USB-C male plug. It lets owners of compatible ThinkPad chargers power USB-C laptops, tablets or phones without carrying the original brick. The built-in PD identification chip negotiates the correct voltage automatically.

PD chip negotiates 5 V, 9 V or 20 V at up to 140 W

The adapter accepts 15 V to 20.5 V from the square-tip supply and delivers 5 V or 9 V at 2 A, or 20 V at 7 A. No 12 V or 15 V output is provided. Input power must exceed the connected device’s demand; a 90 W brick cannot run a 90 W or 100 W laptop through this unit.

Compact dongle replaces a bulky charger in a bag

The male USB-C tip plugs directly into the target device while the square female end mates with the existing ThinkPad power brick. One piece in the package keeps cable clutter low for office, studio or travel use. It does not add Thunderbolt or video signalling — only PD charging.

How it compares

Measured against everything we stock in USB Adapter Cables & Dongles, at today’s prices. Recalculated every night.

Price $14.99
Typical for this category: the median of 1,430 items is $14.99.

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Specifications

Product
Brand nameSinLoon
Product colorBlack
Ports & slots
Thunderbolt 3 supportUSB
In the box
Units per package1

Questions about this item

How do I connect the square female input to my power brick and what is the common mistake?

Plug the square female end onto the slim tip of your PD power brick, then insert the USB-C male end into your device; the brick must supply more than 140 W or the adapter will not work.

What component may need replacement after extended use?

The built-in PD automatic identification induction chip handles voltage negotiation; if it fails the adapter will stop delivering 5 V, 9 V or 20 V to the connected device.

What power limit appears first during continuous charging?

The adapter caps output at 140 W (20 V at 7 A) and provides no 12 V or 15 V steps, so sustained loads above that level will be rejected.

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