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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

  • ColorBlack
  • TypeUSB Type C
  • CompatibilityLaptop
  • AC Adapter Voltage20 volts
  • AC Adapter Output Power100 watts
  • Weight0.01 kilograms
  • 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.

Highlights

  • 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

Specifications

BrandSinLoon
Model7.9 x 0.9mm
ColorBlack
TypeUSB Type C
CompatibilityLaptop
AC Adapter Voltage20 volts
AC Adapter Output Power100 watts
Weight0.01 kilograms

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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