Adapter extra digital USB Type-C to DC 5.5×2.1 mm — power conversion cable for devices requiring 5.5×2.1 mm barrel

USB Type-C to DC 5.5x2.1 mm Adapter by extra digital converts a USB Type-C PD output into a standard 5.5x2.1 mm DC plug, allowing devices with a barrel DC input to be powered from USB-C chargers that support Power Delivery. The adapter connects a USB Type-C female input to a 5.5x2.1 mm male barrel output and is intended for powering laptops and various portable electronics that accept the common barrel size.

Advantages

This adapter supports USB Type-C Power Delivery up to 100 W (19.5 V / 5 A), enabling higher-power devices to be powered from compatible USB-C chargers. It provides a simple, compact solution to reuse modern USB-C chargers with older devices that use a 5.5x2.1 mm DC input and does not require modifications to the original devices or chargers. The design is plug-and-play and fits standard 5.5x2.1 mm DC ports without a center pin.

Suitable for

• Powering laptops that accept a 5.5x2.1 mm DC barrel input and support ~19.5 V.
• Powering routers, monitors, LED lighting modules and other small appliances with 5.5x2.1 mm DC ports.
• Using modern USB-C PD chargers to supply power to legacy devices with a barrel connector.

When it may not be suitable

The adapter transmits power according to the capabilities of the USB-C charger and cable; if the charger or cable cannot provide sufficient voltage or current, the connected device may not operate or may charge slowly. It is not a universal solution for devices that require specific center-pin identification, communication protocols, or voltages other than those negotiated by USB-C PD. Do not assume compatibility with devices that require non-standard voltages or device-specific handshake signals.

Key specifications

• Input connector: USB Type-C (female)
• Output connector: DC barrel 5.5 x 2.1 mm (male)
• Supported voltage: up to 19.5 V (negotiated via USB-C PD)
• Maximum power: up to 100 W
• Maximum current: up to 5 A
• Standard: USB Type-C Power Delivery (PD)

How to use

Connect a USB-C PD compatible charger to the adapter’s USB Type-C female port using an appropriate USB-C cable, then insert the 5.5x2.1 mm barrel plug into the device’s DC input. Ensure the charger and cable support the required PD profile and sufficient current for the target device. Verify the device’s voltage requirements before connecting and monitor the first usage to confirm correct operation.

What to consider before purchase

• Check the device’s required input voltage and current to confirm compatibility with USB-C PD negotiation up to 19.5 V / 5 A.
• Ensure your USB-C charger and cable are rated for the needed power (up to 100 W) and support Power Delivery.
• Confirm the device’s barrel connector dimensions are 5.5 x 2.1 mm and that no centre-pin identification is required.

Usage recommendations

Use a high-quality USB-C PD charger and cable rated for the device’s power needs, and check device temperature and operation during initial connection. If the device does not power on or behaves unusually, stop use and verify voltage/current requirements and compatibility.