Wall Adapter Power Supply - 5.1V DC 2.5A (USB Micro-B)

This is a high-quality switching 'wall wart' AC to DC 5.1V 2,500mA USB Micro-B wall power supply manufactured specifically for projects that require a higher level of power. This compact USB AC charger is UL and CSA listed and incorporates a highly regulated output switching power design to assure a constant, accurate DC power delivery.

These wall adapters are perfect for supplying power to the Raspberry Pi 3's power requirements. Each adapter features a no-load voltage regulation within 3 percent of the rated output and works with 100-240VAC inputs.

  • Input voltage: 100~240VAC
  • Load regulation +/- 3%
  • Output voltage/capacity: 5.1V; 2.5A
  • Output cord length: 4'
  • Output cord connector: Micro-B USB type
  • UL and CSA compliant

Wall Adapter Power Supply - 5.1V DC 2.5A (USB Micro-B) Product Help and Resources

How to Power a Project

February 7, 2013

A tutorial to help figure out the power requirements of your project.

Pi AVR Programmer HAT Hookup Guide

July 26, 2018

In this tutorial, we will use a Raspberry Pi 3 and the Pi AVR Programmer HAT to program an ATMega328P target. We are going to first program the Arduino bootloader over SPI, and then upload an Arduino sketch over a USB serial COM port.

Core Skill: Electrical Prototyping

If it requires power, you need to know how much, what all the pins do, and how to hook it up. You may need to reference datasheets, schematics, and know the ins and outs of electronics.

2 Electrical Prototyping

Skill Level: Rookie - You may be required to know a bit more about the component, such as orientation, or how to hook it up, in addition to power requirements. You will need to understand polarized components.
See all skill levels


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.

  • craigjw / about 7 years ago / 1

    I checked the datasheet but could not find the dimensions of the micro usb plugable end. If possible, could someone measure and post the following dimensions: 1: Length of the micro usb plug (from the usb tip to the start of the molded plastic) 2: Height and width of the molded plastic Thanks

  • Member #100380 / about 8 years ago / 1

    This is bundled with the Sparkfun Raspberry Pi 3 Starter kit: https://www.sparkfun.com/products/13826

    But at the official FAQ for the Raspberry Pi 3, they say it should have a 2.5 A power supply, while this is only 2.4 A. https://www.raspberrypi.org/help/faqs/#powerReqs

    So far it has worked fine for me, even with a camera module plugged in, but I guess it depends on what you're doing. So beware.

  • Arbiag / about 8 years ago / 1

    I'm confused, the description says "USB Micro-B", the features say "Micro USB A" - am I missing something?

    • l0gikG8 / about 8 years ago / 1

      The fourth photo shows a USB Micro-B. Also, the Micro-B fits the Raspberry Pi 3 but the Micro-A will not. The feature line is probably incorrect or else there are a lot more problems with this listing.

  • ic / about 8 years ago / 1

    It would be nice if you could source a similar high quality power supply which has interchangeable power socket pins (like you see with some phone chargers) for us poor international folk.... Sure we can get them on ebay from China, but I would be more comfortable with a unit supplied and endorsed by SparkFun.

  • Member #360077 / about 8 years ago / 1

    These switching power supplies can create a lot of RF noise, and sometimes include a ferrite core imbedded in the cord to quiet the noise. I do not see an imbedded core here. Is there a core internally? If not, I would recommend to people that they attach a core to the cord to avoid electrical interference to other electronic devices:


  • Aristarco / about 8 years ago / 1

    The 5V/2A version with barrel plug (TOL-12889) says it only gives 4.5 @ 2A. Does this one compensates with the slight overvoltage (0.25) so it is 5V @ full 2.4A? Could you SF guys or commentators clarify this? Thanks in advance.

    • CF / about 8 years ago * / 2

      Hi and thanks for asking! I just tested one of these and with a 2.4 amp load, the voltage comes out to 5.03 volts. The reason for the difference between this supply and the older one is this supply has thicker wires that have a lower resistance allowing you to use have a 5 volt output at full load.

  • 172pilot / about 8 years ago / 1

    Since this is "unregulated", is it not appropriate to use these to power the pi through the GPIO pins? I know it sounds stupid to cut off the connector and connect to the pins, when there's a perfectly good micro USB on here, but in my application, the physical box is just wide enough for the pi, so I can't have anything sticking out the side, so I've used the 2A regulated wall wart and powered through GPIO in the past, but I've read that it's not a good idea with unregulated power... I guess it's time to build a small regulator/fuse board that I can put on top of the pi for this..

Customer Reviews

4.5 out of 5

Based on 23 ratings:

Currently viewing all customer reviews.

1 of 1 found this helpful:

Okay for RPI + Camera. Not Okay for Matrix Voice.

I got a Matrix Voice board to go with my Raspberry Pi Zero. This adapter seemed not to provide enough current, because the Raspberry Pi kernel-segfaulted. That's a known failure mode if your adapter doesn't supply enough current. Other than that, it was fine running the Raspberry Pi Zero + camera + servo board + pan/tilt servos.

Power to the Pi

Purchased two of them for the two RPi3s I ordered. No complaints here. They can both be plugged in side-by-side and they run cool.

Does what it should

Powers the Raspberry Pi 3 with no issues

Performs as expected

The wall adapter supplies power to the respberry pi 3 and the ssd and the 8 relay module just fine

Yes. You need this for the Pi

I have a project that uses pi's with a small screen, an lcd, and a 64G thumb drive. Being new to the pi world, I assumed that that usb micro-b power socket meant I could use a phone charger power supply. I had measured the project current to be .8 amps with a usb current meter and since the charger power supply said it was rated 2.4 amps I figured i was good to go. wrong. The lcd flickered and the pi would hang and then get stuck in an fsck loop. Bought this supply and all problems disappeared. It's been running for a few weeks now without a glitch. I wish it had a usb socket instead of a cord because I wanted to use cables with 90 degree plugs. I had to buy an adapter. But that's my problem.

Great Quality

These power adapters are exactly as described. Very high quality.

Both items were what I needed

Both adapters are doing the job I expected -- they not only power the fan, they also power the usb ports -- from what I can gather since using them on my cooling assemblies.

Works exactly as advertised

I see myself buying a couple more of these, to go with the couple more Raspberry Pi's in my future.

Works as promised.

I was needing a higher amp output power supply for a Raspberry Pie project. It was at a good price and is working well.


Works As Intended.

The only thing I wish this power supply had was an On/Off switch. Besides that. Great!

Works well with my Raspberry Pi

How about adding an on-off switch?

Perfect For Raspberry Pi!

I was using another manufacturer's power supply and was getting a constant low power warning from my Pi. I bought this guy and my Pi is chugging along perfectly, no matter what peripherals I'm using!

Good Wall Adapter

The extra voltage (5.1) and good regulation allow for distance at 1 or 2 amps. Good plan.

Worked perfectly for my project

I used this power supply to power nightlight projects. It powers a circuit python microcontroller and a strip of dotstar leds.

A must-have to power the RPi3

Cuz' 1A just won't cut it.

Nothing like the original

I bought these to support a Raspberry Pi 3B+ with 'Official' Raspberry Pi Touchscreen. Which, in theory, it should have supported. Ended up getting the Low Power Lightning Bolt on the touchscreen.

I ended up using two of them, one for the Touch Screen and one for the RPi3B+.

Solid inexpensive power supply

I got this for a Raspberry Pi 3. It's powering the Pi, a thumbdrive,a usb cdrom reader, and various other bits. Absolutely solid - no power issues at all. Great product at a reasonable price.

Wall adpater works fine for RaspPi 3B+

Previous adapter must not have had enough voltage, this works fine.

Works fine with Raspberry 3

Powers up the Raspberry Pi 3!

Seems Solid

It's a power supply that I'm using to power a Raspberry Pi 3. Working so far and seems like a good supply at a good price.