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Description: 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

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Customer Comments

  • This is bundled with the Sparkfun Raspberry Pi 3 Starter kit:

    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.

    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.

  • I’m confused, the description says “USB Micro-B”, the features say “Micro USB A” - am I missing something?

    • 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.

      • Yeah, typo. Just and FYI they have a typo on their box as well (just in case someone gets confused). Thanks!

  • 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.

  • 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:

  • 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 a year ago * / 1

      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.

  • 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..

    • “and incorporates a highly regulated output” You should be fine. It is odd though that they included a link to their “Unregulated Power Supply Tutorial.” Does send a mixed message there, doesn’t it?

Customer Reviews

5 out of 5

Based on 6 ratings:

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Works fine with Raspberry 3

Powers up the Raspberry Pi 3!

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.