USB to 5.5x2.1mm Barrel Jack Power Cable (5V, 75 cm)
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Prices updated: 13 Oct 2026
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About this product
A 75 cm cable that connects a USB Type-A port to a 5.5 x 2.1 mm barrel connector with center-positive polarity. It lets you power 5 V development boards such as Arduino from a computer, laptop or USB power adapter. The USB specification limits current to 500 mA, which is enough for simple boards.
Specifications
- Connector A
- USB Type-A
- Connector B
- 5.5 x 2.1 mm barrel, center positive
- Output voltage
- 5 V
- Max current
- 500 mA (USB limit)
- Cable length
- 75 cm
- Suitable for
- Arduino boards
Frequently asked questions
What is the polarity of the barrel plug?
The center pin is positive (+5 V) and the outer sleeve is ground. Confirm the board's polarity marking before connecting.
Can I power an Arduino Uno with this cable?
This cable delivers 5 V from USB. Many boards, including the Arduino Uno, are designed for 7-12 V on the barrel jack, so 5 V may not regulate correctly there. Check your board's manual, or use its 5 V pin if it has one.
