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Black compact adapter with DC 7.9 x 0.9 mm female input and USB-C male output

BUCIER

BUCIER DC 7.9 x 0.9 mm Female to USB-C Male PD Adapter 100 W

SKU CH-ZFNB-XFX99

Converts a 7.9 x 0.9 mm DC barrel jack to a USB-C male plug with built-in PD chip for 100 W laptop charging

  • Power adapter voltage20 V
  • Power adapter wattage100 W
  • Product colorBlack
  • Product typeUSB Type C
  • Compatible withLaptop
  • Product weight0.01 kg
  • Converts DC 7.9 x 0.9 mm input to USB-C PD output up to 100 W
  • Built-in PD automatic identification chip negotiates 5 V, 9 V and 20 V profiles
  • Input accepts 15 V–20.5 V DC so compatible with many laptop chargers
  • Weighs only 0.01 kg for pocket-portable travel convenience
  • Charger power must exceed laptop demand — 90 W charger runs 86 W or 65 W laptop

DC 7.9 x 0.9 mm to USB-C PD adapter

This adapter converts a DC 7.9 x 0.9 mm barrel jack into a USB-C male plug with Power Delivery support. It is designed for users who need to power or charge USB-C laptops, tablets or phones from an existing DC power source. The built-in PD identification chip negotiates 5 V, 9 V or 20 V output automatically. Input voltage must exceed the device's required power.

Thermals noise and power draw

The unit weighs 0.01 kg and operates without a fan, so it adds no audible noise to a workspace. It passes through up to 100 W of power with a 20 V output rail, while the input accepts 15 V to 20.5 V from the source adapter. No active cooling is required because the adapter itself does not generate significant heat during normal use.

Replaces a proprietary barrel charger

It replaces a dedicated barrel-tip charger when you want a single USB-C cable for multiple devices. The upgrade is worth it if your DC source delivers more watts than the target device draws — for example, a 90 W source for a 65 W or 86 W laptop. It will not work if the source and load are both rated at the same wattage or if the load exceeds 100 W.

How it compares

Measured against everything we stock in Laptop Chargers & Batteries, at today’s prices. Recalculated every night.

Price $14.99
Cheaper than about 83% of the 27,790 comparable items (median $30.99).

Specifications

Product
Brand nameSinLoon
Model name7.9 × 0.9 mm
Product colorBlack
Product typeUSB Type C
Power
Power adapter voltage20 V
Power adapter wattage100 W
Size & build
Product weight0.01 kg
Compatibility
Compatible withLaptop

Questions about this item

How do I connect the DC 7.9 x 0.9 mm female input to my laptop's USB-C port and what step is often missed?

Plug the adapter's DC 7.9 mm female jack into your charger's output tip, then insert the USB-C male end into the laptop. The step often missed is confirming the charger supplies 15 V–20.5 V and exceeds the laptop's draw — a 90 W charger cannot run a 90 W laptop.

What maintenance or replacement will this adapter need over time?

No scheduled maintenance is required. Replace the unit if the DC jack feels loose, the USB-C plug wobbles, or the built-in PD chip stops negotiating 5 V, 9 V or 20 V profiles.

What limit appears first when I run this adapter continuously at high load?

The 100 W output ceiling is the first limit. The adapter only delivers 20 V at 5 A and lacks 12 V or 15 V steps, so sustained loads above 100 W will not be supported.

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