Wall Adapter Power Supply - 5V DC 2A (USB Micro-B)

This is a high quality switching 'wall wart' AC to DC 5V 2000mA USB Micro-B wall power supply manufactured specifically for SparkFun Electronics. These are switch mode power supplies which mean the output is regulated to 5V and the capable output current is much higher (2000mA).

These wall adapters are perfect for supplying power to many single-board computers like the pcDuino or the Raspberry Pi but NOT the Raspberry Pi 3, you will need a higher grade wall adapter for that. Please note, this specific supply (5V/2A) is also FCC/CE certified and works with 100-240VAC inputs.

Note: These wall adapter power supplies may only output 4.5V when pulling a full 2A. Please keep this in mind when making your purchase.


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  • kosme / about 6 years ago / 1

    I would really love the schematics for these. I took one apart and used the circuit to power a prototype. Now I would like to integrate it inside my project for building a 200 batch without having to tear apart 200 power supplies.

  • stevenvh17 / about 9 years ago / 1

    This wall adapter doesn't seem to be the "high quality" which it promises in the datasheet: the only review reports failure after one use, and the only comment on it (the other comments are questions) reports that it crashed the board it powered.

    This shouldn't surprise us: 6 dollar for a device which is produced in low quantities (it was custom made for SF) is just too low to get good quality. It rings the question why it was custom made. Devices like this are made by the millions (though they usually have a DC-plug instead of the USB). Anyway, I would be prepared to pay a couple dollars extra for a really reliable power supply.

    Another peeve: apparently only available with a US power plug, so for the 230V ability I would have to pay extra for a power plug adapter anyway.

    Despite the 230V capability I can't

    • M-Short / about 9 years ago / 1

      Don't always just go buy reviews. Especially for something this simple people rarely take the time to write a review saying "It works". We've sold thousands of these and I see 2 complaints, that's actually a pretty good record. As for the US plug, remember we are a US company and a large percentage of our customers are in the US. Every time we try carrying something with a different connector we end up discontinuing it because it doesn't sell. These are so common now a days that people aren't going to pay the international shipping fees to get a power supply when they can find one at their local store much easier.

  • Member #549175 / about 9 years ago / 1

    Hi, This Wall adapter work with Raspberry Pi model B+? --- Do you have heatsink for Raspberry Pi model B+?

  • Member #504692 / about 9 years ago / 1

    I purchased this to use with a pcDuino Lite Wifi. It worked great for about 24 hours, and then crashed the board. I don't think it does enough power filtering for the pcDuino's which require a more stable power source than most.

  • Member #334613 / about 10 years ago / 1

    Will it work for Raspberry Pi - Model B+ which requires 2Amps & datasheet of this adapter shows 2.2Amps Max. output?

  • Circuitsoft / about 10 years ago / 1

    Does this do the secret handshake to charge phones and tablets quickly?

  • Member #549175 / about 9 years ago / 0

    Hi, This Wall adapter work with Arduino Yun?

    • Kamiquasi / about 9 years ago / 1

      yes :) 5V, micro USB connector, >= 500mA (the Yun has a PTC fuse to prevent overdrawing on standard computer ports)

Customer Reviews

3.2 out of 5

Based on 16 ratings:

Currently viewing all customer reviews.

1 of 1 found this helpful:

So far, no infant mortality!

I've been running this supply for about 48 hours now, and the only issue I've found is that it is emitting a high-pitched whine. I'm assuming this is just some switcher noise, and won't be an issue. I'll update if the supply flames out, but so far it's doing great!

1 of 1 found this helpful:

It is so loud you should not use it inside your home.

I bought 4 or 5 of these - they all emit so much high pitch noise that you wont be able to sleep in the room with this power supply plugged in.


Have you contacted our technical support department @ techsupport@sparkfun.com ? They may be able to help resolve the issues you're having with these wall warts.

Works fine

This product exactly matches the description. Works just fine.

great power supply.

Simple and easy to use. Compact, has enough capacity to power my board and its accessories.

just what I needed

Just what I needed and not a nothing more for a very good price. Lots of package deals out there but all I needed was the power supply (wall wart). They got it to me very quickly. Very good deal. I will be ordering a camera and a couple other goodies here too.

Solid power

This power block is powering a Pi just fine. It appears to keep the Pi stable and continuously operational.

Just the right adapter for a Raspberry Pi

The 2A powers my Model 2 Pi with enough margin to power the Wifi, mouse, and keyboard.

Does its job, powers a Raspberry Pi

Works as advertised, powers my Raspberry Pi without any issues.

Poor quality

The first one made an annoying high pitch whine. Sparkfun sent me a new one and the second one did not work.

I'd rather pay more to get a power supply that doesn't drive everybody in my house nuts.

Great with RPi2

Bought two of these for my two Raspberry Pi 2s. They work well with no issues. One of these powers both my Raspberry Pi 2 and the 7" touchscreen for the Raspberry Pi A touchscren I also purchased here on Sparkfun.

Danger! Black is Positive / Red negative

Some of these have the polarity/color of the cables reversed! If you cut the cable to use them directly as 5V power source without USB plug, be very careful!! I just burned quite some charge controllers until I found this out (remote place, no multimeter). Why on earth would someone have red negative and black positive??

5V Regulation is terrible

Bought this to power a Pro Mini based project that used a combination 3x 8-pak Lumenatis, analog and digital inputs. Even with LEDs low power, using the wall adapter caused erratic behavior. Oscilloscope showed significant oscillation around 5V. If I use a 9W, 1.5A USB wall adapter (borrowed from my Echo Dot) there are no issues.

I think you may have a defective unit. Please contact our tech support department at techsupport (at) sparkfun (dot) com for assistance with this.

0 of 1 found this helpful:

Failed after one use

I plugged this into a Raspberry Pi B+ soon after I received it, and it worked fine.

A couple weeks later, I plugged it in again. No light, no power. Tried several outlets that I know work. Still no light, no power.

I tried a Belkin 5v 2.1A USB power supply with a micro USB cable. That is working great.

So I'm puzzled as to why the supply isn't working, when it worked out of the box.

Loud high pitch noise

Avoid this one it makes a really annoying high pitch noise on the two units I got.

Just Right

Worked first time with my Raspberry Pi 2B John