Barrel Jack Adapter - USB to 5.5mm

This is a simple cable that adapts from a USB port to a 5.5x2.1mm barrel connector, center positive. This cable allows the user to use a USB port on a computer, laptop, or on our cigarette power supply to provide our development boards with 5V.

The USB specification limits current consumption to a max of 500mA from a USB port but this is more than enough to run a simple development board.

Cable length is 3 feet.

Barrel Jack Adapter - USB to 5.5mm Product Help and Resources

Connector Basics

January 18, 2013

Connectors are a major source of confusion for people just beginning electronics. The number of different options, terms, and names of connectors can make selecting one, or finding the one you need, daunting. This article will help you get a jump on the world of connectors.


Looking for answers to technical questions?

We welcome your comments and suggestions below. However, if you are looking for solutions to technical questions please see our Technical Assistance page.

  • Member #1504424 / about 5 years ago / 1

    Really good!

  • bobdabiulder / about 8 years ago / 1

    I'm so confused! The arduino has a 2.1mm jack and this is 5.5! What?!

    • waspinator / about 8 years ago / 1

      The sizes may refer to the outer (5.5mm) and inner (2.1mm) diameters.

  • PickledDog / about 10 years ago / 2

    These are handy! I use mine to power a Beaglebone from a USB battery pack. I'm using a pack that delivers 2A while maintaining regulation, so it's as good as any "proper" 5V supply :)

  • TonyW / about 16 years ago / 2

    This cable works great to power the BeagleBoard from a USB port. You need power on the barrel connector to run the BeagleBoard as a host.

    • TimZaman / about 13 years ago / 1

      Not really. You're really going to need a Y-splitter for that. When the beagleboard is fully operational (especially with a webcam and usb stick on it) it'll draw more than 500mA (more than 1 usb host can deliver).

  • Macduino / about 12 years ago / 1

    Really good!

  • willydlw / about 12 years ago / 1

    I am unsuccessfully trying to power the Olimex 40 pin AVR board with this adapter. The chip is an Atmega32. The adapter is not supplying enough power. Purchased several of these and have tried each cable individually with multiple usb ports on different computers (yes, different computer models and manufacturers).

    Has anyone successfully had these work with the Olimex 40 or 28 pin boards, 40 pin chip Atmega32, 28 pin chip Atmega 328?

  • Member #143562 / about 13 years ago / 1

    Will these be back in stock soon?

  • ninjataki / about 13 years ago / 1

    will this work the other way, power from a hand crank (that uses a usb outlet) through the cable and out the barrel jack? sorrf for noob question

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