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A black USB-C cable with a 5.5 by 2.1 mm barrel plug, one hundred centimetres long

Fervit

Fervit USB-C 5.1k Resistor to DC 5.5*2.1mm Cable 100cm

SKU CH-YMFD-M6ZQ6

A USB-C to 5.5×2.1 mm DC cable with a built-in 5.1 k resistor delivers fixed 5 V at up to 3 A for small devices such as dashcams and desk lamps

  • Fixed 5V 15W output protects 5V devices from high voltage
  • Built-in 5.1k resistor ensures correct PD handshake for 5V power
  • 100cm two-core cable delivers up to 3A for small DC electronics
  • Powers dashcams, LED strips, desk lamps and cooling fans via 5.5*2.1mm jack
  • Plug into any standard Type-C PD charger for simple DC barrel conversion

Fixed 5V 15W USB-C to DC Adapter

This cable converts a USB-C PD charger into a fixed 5V power source for small barrel-jack devices. It contains a built-in 5.1k resistor that limits output to 3A and 15W maximum. The 100cm two-core design carries power only and does not support data transfer or any fast-charging protocols. It is intended for users who need to run 5V accessories from a Type-C supply.

Barrel Plug Compatibility and Daily Use

The DC 5.5*2.1mm male connector fits many desk lamps, cooling fans, LED strips and dashcams that use the same barrel size. Because the cable delivers a constant 5V, it cannot power equipment that requires 9V, 12V, 15V or 20V. The fixed resistor means the source charger must support standard 5V PD negotiation; otherwise the cable will not activate. No data lines are present, so the cable cannot be used for firmware updates or device communication.

Verify Device Voltage and Jack Before Ordering

Check that your device operates on 5V and draws no more than 3A, as higher loads will exceed the cable limit. Confirm the barrel jack measures 5.5mm outer diameter and 2.1mm inner diameter; other sizes will not connect. Ensure your USB-C charger provides a 5V PDO, because the cable cannot request higher voltages. This adapter is not suitable for laptops, high-power peripherals or any device needing data connectivity.

How it compares

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

Price $15.99
Pricier than about 55% of the 15,227 comparable items (median $14.99).

Specifications

Product
Brand nameFervit

Questions about this item

Does the built-in 5.1k resistor limit the cable to 5V 3A output?

Yes, the 5.1k resistor fixes the output at 5V with a maximum of 3A and 15W, and it blocks any 9V, 12V, 15V or 20V negotiation.

Will the 5.5mm by 2.1mm barrel plug fit my device's DC jack?

The cable ends in a 5.5mm outer diameter, 2.1mm inner diameter male barrel connector; verify your device uses that exact jack size before connecting.

How do I power a dashcam with this cable from a Type-C PD charger?

Plug the Type-C male end into a standard PD charger, then insert the 5.5mm by 2.1mm barrel plug into the dashcam's DC port; the cable carries power only, no data.

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