Adafruit
5V 4A (4000mA) switching power supply - UL Listed
$29.17
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This UL-listed switching power supply delivers a clean, regulated 5V DC output at up to 4A (4,000mA / 20W) via a standard 5.5×2.1mm centre-positive DC barrel...
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This UL-listed switching power supply delivers a clean, regulated 5V DC output at up to 4A (4,000mA / 20W) via a standard 5.5×2.1mm centre-positive DC barrel jack. It accepts 110–240V AC input and is ideal for powering LED matrices, NeoPixel strips, and other high-current 5V projects.
Key Features
- Output – 5V DC at up to 4A (20W)
- Connector – 5.5mm OD / 2.1mm ID centre-positive DC barrel jack
- Input – 110–240V AC (universal)
- Certifications – FCC, CE, UL listed
- Stable Output – Minimal voltage droop at high currents
Compatible Accessories
- 2.1mm Barrel Jack Extension Cable (1.5m)
- Breadboard-Friendly 2.1mm DC Barrel Jack
- 2.1mm DC Barrel Jack to Alligator Clips
- 4-Way 2.1mm DC Barrel Jack Splitter
Ideal For
- RGB LED matrices and NeoPixel projects
- Addressable LED strips (WS2812B, LPD8806, etc.)
- High-current 5V devices and multi-motor setups
Package Contents
- 1× 5V 4A Switching Power Supply (US plug, 5.5×2.1mm DC barrel jack)
Important: This supply ships with a US 2-prong plug. A plug adapter or replacement figure-8 (IEC C7) cable is required for use in Australia.
Note: This supply is not suitable for powering an Arduino via its DC jack, as the Arduino's onboard regulator requires at least 7.5V input.
Jargon buster
Plain-language definitions for the technical terms used above.
- DC barrel jack
- A round power connector commonly used for low-voltage DC power supplies, often described by its outer and inner diameters such as 5.5 x 2.1 mm. Matching the barrel size and polarity is important so the plug physically fits and powers the device correctly.
- LED
- A light-emitting diode is a small electronic component that lights up when current flows through it in the correct direction. In this kit, LEDs create the flashing effect, so polarity and correct soldering matter for the project to work.
- NeoPixel
- A type of addressable LED system where colour data is sent along a single digital data line from one LED or controller to the next. Compatibility matters because the timing and signal format must match for the lights or driver board to respond correctly.
- RGB
- Short for red, green and blue, usually referring to an LED that can mix those three colours. It matters because controlling an RGB LED teaches how separate outputs combine to create different colours.
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