6ft USB to 5V DC Power Cable, 5.5 x 2.1 mm Barrel Plug, Power Only, Black

The CableLeader U2112-XXXX is a USB to DC power cable that takes 5V from any USB-A source and delivers it through a 5.5 x 2.1 mm barrel plug, in 3ft and 6ft in black. The point is to remove a wall wart: a device that would normally need its own 5V adapter can instead run from a USB charger, power bank, laptop port, car adapter or the USB socket on a television.

This is a power cable and nothing else. The manufacturing drawing shows USB pin 1 wired to the barrel centre conductor and USB pin 4 wired to the sleeve, with the D+ and D- lines terminating at the USB plug and going no further. No data of any kind crosses to the barrel end, which is exactly correct for the job but worth stating plainly because the USB connector leads some buyers to expect otherwise.

The barrel end is 5.5 x 2.1 mm on a 22.5 mm body with a tuning fork centre contact, wired centre positive and sleeve negative. Two checks matter before connecting anything. First, confirm the device actually runs on 5V — a great many barrel-jack devices expect 9V or 12V, and this cable cannot supply those. Second, confirm the device is centre positive, because reversed polarity damages equipment that lacks reverse-protection.

Barrel sizing is the other trap. The 5.5 x 2.1 mm plug shares its outer diameter with the 5.5 x 2.5 mm size and differs only in the 0.4 mm inner bore, so the wrong one appears to fit. A 2.1 mm plug in a 2.5 mm jack makes intermittent contact and causes random reboots; a 2.5 mm plug forced into a 2.1 mm jack permanently spreads the socket contacts.

How much current the cable delivers is set by the source, not the cable. A computer USB 2.0 port supplies up to 500 mA by specification and a USB 3.0 port up to 900 mA, while a dedicated USB charger commonly supplies more. This is a passive cable with no negotiation electronics, so it passes through whatever the port and the device settle on.

The black jacket provides a professional appearance and blends into standard office, rack, and enclosure installations.

Compatibility & Ordering Information — U2112-XXXX suits any 5V device with a centre-positive 5.5 x 2.1 mm DC jack, which commonly includes small routers and access points, security and IP cameras, LED strips, Bluetooth speakers, USB hubs, TV boxes and hobby electronics. The family ships in 3ft and 6ft, both black. If the device jack is the smaller 3.5 x 1.35 mm size, see the USB to DC 3.5 x 1.35 mm cable instead; devices requiring 9V or 12V need a mains adapter rather than a USB source.

Product Comparison: USB to DC 5.5 x 2.1 mm vs 3.5 x 1.35 mm Power Cable

Both cables take 5V from a USB port and deliver it through a barrel plug. The plug size is what decides which one your device needs, and the two are not interchangeable:

Rule of thumb: read the device label beside the jack, which prints the voltage, polarity and usually the plug size. Both cables supply only 5V, so any device asking for 9V or 12V needs a mains adapter regardless of which barrel size fits.

FAQ

What is the difference between a 5.5 x 2.1 mm and a 3.5 x 1.35 mm DC plug?

Both are barrel plugs but they are entirely different sizes and are not interchangeable. The 5.5 x 2.1 mm size is the larger standard used by routers, cameras and LED equipment, while 3.5 x 1.35 mm is the smaller size found on portable drives, small routers, speakers and card readers. Check the device label or measure the jack before ordering.

Will this cable power my router, camera or LED strip?

Yes, provided the device runs on 5V with a centre-positive 5.5 x 2.1 mm jack. That covers many small routers and access points, IP and security cameras, LED strips, Bluetooth speakers, USB hubs and TV boxes. Devices that require 9V or 12V cannot be powered from a USB source at all, since USB supplies only 5V.

How much current can this cable deliver?

That depends entirely on the USB source. A computer USB 2.0 port supplies up to 500 mA by specification and a USB 3.0 port up to 900 mA, while a dedicated USB wall charger typically supplies more. This is a passive cable with no negotiation electronics, so it passes through whatever the port and the device agree on.

Does this cable transfer data as well as power?

No. The manufacturing drawing confirms that only VBUS and ground are carried to the barrel plug; the D+ and D- data lines terminate at the USB connector. This is a power cable by design. If a device needs both data and power over USB, it requires a standard USB data cable with the matching device connector instead.

Which USB to DC cable should I buy if I am not sure of the plug size?

Check the device's original adapter or the label beside the jack, which normally prints the voltage, current and polarity along with the plug size. If the label shows 5V with a centre-positive symbol and a 5.5 x 2.1 mm plug, this is the correct cable. If it shows 9V or 12V, no USB-powered cable will work and a mains adapter is required.