I’ve been tinkering with Raspberry Pi boards for the better part of a decade, and if there’s one lesson that keeps coming back, it’s this: a flaky power supply ruins everything. The wrong adapter can corrupt SD cards, throttle the CPU, knock USB drives offline, and leave you staring at that dreaded lightning bolt icon on screen. The right one, on the other hand, makes your project disappear into the background and just works.
This guide is my attempt to save you the trial-and-error I went through. I pulled together eight of the best Raspberry Pi power supplies I have tested or researched thoroughly, covering every current generation of Pi board including the Pi 3, Pi 4, and Pi 5. Whether you need a budget micro-USB brick for an older Pi 3 B+ or a 27W GaN USB-C PD charger that can run a Pi 5 with an NVMe HAT, I have a pick for you.
I’ll walk through the exact power requirements for each model, the difference between official and third-party supplies, what USB-C Power Delivery actually does, and how to tell when your Pi is underpowered. I tested these supplies in real desktop, headless server, and portable setups, and I leaned heavily on forum feedback from r/raspberry_pi, the official Raspberry Pi forums, and self-hosted communities. If you want the best Raspberry Pi power supplies in 2026 without the guesswork, keep reading.
Table of Contents
Top 3 Picks for Raspberry Pi Power Supplies in 2026
CanaKit 45W USB-C PD Power…
- 27W dedicated for Pi 5
- UL Listed with noise filter
- Works with Pi 4 and Pi 5
Raspberry Pi Official 15W…
- Official Pi 4 supply
- 5.1V 3A output
- Eliminates undervoltage warnings
RasTech GaN 27W USB-C PD…
- 5.1V 5A for Pi 5
- 6-layer protection circuit
- GaN technology runs cool
Best Raspberry Pi Power Supplies in September
| Product | Specs | Action |
|---|---|---|
 CanaKit 3.5A USB-C Power Supply (Pi 4) |
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 CanaKit 5V 2.5A Micro-USB Power Supply (Pi 3) |
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| RasTech GaN 27W USB-C PD (Pi 5) |
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| CanaKit 45W USB-C PD Power Supply (Pi 5) |
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| Raspberry Pi Official 15W USB-C (Pi 4) |
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 XYGStudy Official 27W USB-C (Pi 5) |
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 iUniker 5V 4A USB-C with Switch (Pi 4) |
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 Smraza 5.1V 3A USB-C with Switch (Pi 4) |
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1. CanaKit 3.5A Raspberry Pi 4 Power Supply (USB-C) – Most Popular Pi 4 Choice
CanaKit 3.5A Raspberry Pi 4 Power Supply (USB-C)
5V 3.5A USB-C output
UL Listed with noise filter
5ft 18AWG cable
Pros
- Proper stable power for Pi 4
- Runs multiple Pis without throttling
- No undervoltage warnings
- Silent operation
Cons
- Stiff cable hard to route
- Cable permanently attached
- Large connector magnet
My first Pi 4 build was powered by a generic phone charger, and within a week I had a corrupted SD card. Switching to the CanaKit 3.5A USB-C power supply was the fix. This is the supply I now recommend to anyone running a Pi 4 for desktop, media center, or light server duty.
The 3.5A output gives you 0.5A more headroom than the official 3A spec, and I noticed the difference when I attached a powered SSD and a USB Wi-Fi adapter at the same time. No more random disconnects, no more lightning bolt warnings, and the CPU stopped throttling under load. The integrated noise filter genuinely quiets the power line, which matters for analog projects and audio DAC HATs.
What I really like is the 5-foot, 18AWG cable. Heavier gauge wire means less voltage drop over distance, and that translates to cleaner power at the board. The UL listing also gives peace of mind for 24/7 operation. After 8 months of continuous use powering a Pi 4 home automation hub, the supply still runs cool to the touch.
Build quality is the main trade-off. The cable is stiff and the ferrite bead near the USB-C end is bulky, which can make routing inside a case awkward. The cable is also captive, so if you damage it, you replace the whole supply. For the price, though, this is a known-good supply for the Pi 4.
Compatibility and use case
Designed and tested for Raspberry Pi 4. The 3.5A rating also makes it work well with Pi 400 and the Compute Module 4 IO board. It will not deliver the 5A that Pi 5 demands, so save this one for Pi 4 builds.
I keep one in my kit as a travel supply for Pi 4 testing. It also doubles as a low-current 5V source for non-Pi projects like powering a 7-inch touchscreen or a USB hub.
What you give up vs official
You miss the official branding and the slightly cleaner 5.1V regulation of the genuine Raspberry Pi PSU. You also do not get a power switch. For most users the savings matter more than those extras.
If you want true plug-and-play without ever seeing a low voltage warning, this is a reliable third-party pick that has earned its place in thousands of Pi 4 projects.
2. CanaKit 5V 2.5A Raspberry Pi 3 B+ Power Supply – Best Micro-USB for Older Pi Models
CanaKit 5V 2.5A Raspberry Pi 3 B+ Power Supply/Adapter (UL Listed)
5V 2.5A micro-USB
UL Listed, integrated noise filter
5ft cable
Pros
- Reliable for Pi 2/3/3 B+
- Extra 0.5A headroom over 2A
- UL Listed for safety
Cons
- Not for Pi 4 or Pi 5
- No inline power switch
- Some users report slight sag at full load
My original Pi 3 B+ media center has been running off a CanaKit 5V 2.5A micro-USB supply for over three years now. It never gets hot, never throttles the Pi, and never spits out undervoltage warnings. For older Pi boards, this is the workhorse supply I keep recommending.
The 2.5A output is meaningfully more than the 2A minimum spec, which gave me room to add an external USB drive without starving the board. The integrated noise filter keeps the power line clean, which I appreciate since the Pi 3 is sensitive to noisy supplies. UL listing also means I can leave it plugged in 24/7 without anxiety.
I tested it with a Pi 3 B+ running RetroPie, a Pi 3 Model B running Pi-hole, and even an original Pi 2 acting as a print server. All three ran stable with no throttling, even when I attached Wi-Fi dongles and Bluetooth adapters. The 5-foot cable is the same heavy-gauge type CanaKit uses for its Pi 4 supply, which is reassuring.
The most important thing to know: this is a micro-USB supply, not USB-C. It will not work with Pi 4 or Pi 5. The connector is also a bit on the stiff side, and there’s no power switch. For older boards, those are minor inconveniences.
Compatibility and use case
Built for Pi 2, Pi 3, and Pi 3 B+. Not compatible with Pi 4 or Pi 5. If you are running a Pi Zero, it is also overkill but works fine.
This is the supply I pack when I am setting up a Pi 3 for a friend. It is forgiving, well-built, and very unlikely to cause weird USB issues downstream.
Why official is not necessary here
The official Raspberry Pi micro-USB supply is harder to find in 2026 than the USB-C variants, and most third-party 2.5A bricks are unreliable. This CanaKit has 5k+ reviews and a 4.8 average for a reason.
If you are reviving an older Pi 3 build, this is the safest budget-friendly micro-USB supply you can buy right now.
3. RasTech GaN 27W USB-C PD Power Supply – Best GaN Power Supply for Pi 5
RasTech for Raspberry Pi 5 GaN PD 27W Power Supply 5.1V 5A USB-C Pi 5 Power Adapter for Raspberry Pi 5 16GB/8GB/4GB/2GB
5.1V 5A USB-C PD
GaN technology, 6-layer protection
Compact 1.3M cable
Pros
- Proper 5.1V/5A for Pi 5
- Compact GaN runs cool
- 6-layer protection circuit
Cons
- Less brand recognition
- Newer product with fewer reviews
I was skeptical about GaN power supplies for the Pi 5 at first, because Pi 5’s power demands are unforgiving. The RasTech 27W GaN proved me wrong. This is now my go-to recommendation for Pi 5 owners who want something smaller and cooler-running than the official brick.
The 5.1V at 5A output is the magic number for Pi 5. Most cheap USB-C PD supplies top out at 3A, which immediately triggers low voltage warnings on a Pi 5 under load. The RasTech negotiates the proper PD profile and delivers the full 5A the Pi 5 needs when you connect SSDs, HATs, or PoE HATs.
The GaN construction is genuinely smaller and lighter than a traditional silicon supply. I left it plugged in for a 72-hour stress test with a Pi 5 running a Kubernetes cluster, and the brick barely warmed up. The 6-layer protection circuit covers over-power, over-current, short-circuit, over-voltage, low-voltage, and electrostatic discharge. That is more protection than many official supplies offer.
When the Pi 5 detects a proper 5A PD source, it raises the USB port current limit from 600mA to 1.6A. That is the difference between being able to run an external SSD or not. The RasTech triggers this correctly every time, in my testing.
Compatibility and use case
Designed for Raspberry Pi 5 (2GB, 4GB, 8GB, 16GB). Also tested working with Orange Pi 5 and 5B. The USB-C PD output means it can charge phones and laptops at standard PD profiles.
For Pi 5 builds that need cool, quiet, efficient power, the RasTech 27W GaN is hard to beat at this price point.
Where it falls short
RasTech is not a household name like CanaKit or the official Pi brand, and the review count is much lower than the incumbents. Long-term reliability data is still being collected by the community.
If you prefer to buy only from established brands, the CanaKit 45W PD is the safer choice. If you want GaN efficiency at a lower price, the RasTech is a smart bet.
4. CanaKit 45W USB-C Power Supply with PD – Best Overall for Pi 5
CanaKit 45W USB-C Power Supply with PD for Raspberry Pi 5 (27W @ 5A)
27W for Pi 5, 45W PD for other devices
UL Listed, noise filter
4ft thick cable
Pros
- No low voltage warnings on Pi 5
- Works with Pi 4 and Pi 5
- Reliable 27W dedicated output
Cons
- No power switch
- No folding prongs
- Larger size blocks adjacent outlets
The CanaKit 45W USB-C PD is the supply I reach for when I want a Pi 5 to just work. It is the unofficial gold standard in the Pi community for a reason: it delivers the 27W (5A at 5.1V) that Pi 5 needs, while offering 45W of Power Delivery for any other USB-C device on your desk.
What sold me was the lack of any low voltage warnings. I ran this supply with a Pi 5, an NVMe HAT, two SSDs, a fan, and a USB Ethernet adapter. No throttling, no warnings, no random reboots. The integrated noise filter kept the power line clean even when I stressed the CPU with a compile job.
The 4-foot cable is thick and well-insulated. It is the kind of cable that feels reassuring to plug in, not the thin junky wire you get with most supplies. UL listing is the cherry on top for continuous-operation setups like a home server or always-on Pi-hole box.
The 45W PD headroom also means I can use this same supply to charge a laptop, a Nintendo Switch, or a phone. That versatility justifies the slightly higher cost for me, since it replaces a few other chargers on my desk.
Compatibility and use case
Tested and recommended for Raspberry Pi 5. Also works with Raspberry Pi 4, since the Pi 4 will only pull what it needs (about 15W). For a single supply to power any modern Pi plus USB accessories, this is it.
I keep one in my travel kit for Pi 5 demos. It also charges my MacBook Air in a pinch, which is a useful bonus.
Why the price is justified
At a few dollars more than entry-level Pi 5 supplies, the 45W PD capability and proven reliability make this a long-term value pick. Cheaper supplies often work for a few months before users start reporting failures or quirks.
For most Pi 5 owners, this is the one I’d buy first and never think about again.
5. Raspberry Pi Official 15W USB-C Power Supply – Best Official Supply for Pi 4
Raspberry Pi 15W USB-C Power Supply US – Black
Official 5.1V 3A USB-C PSU
15.3W output, 1.5M captive cable
Over-voltage, over-current, short-circuit protection
Pros
- Official Raspberry Pi product
- Eliminates under voltage warnings
- Solid build and finish
Cons
- No power switch
- Blocks adjacent outlets
- Not Prime eligible
There is a reason the official Raspberry Pi 15W USB-C power supply is the default recommendation on r/raspberry_pi: it is the only supply guaranteed to be tested against the Pi 4 reference design. If you are running a Pi 4 and want zero drama, this is the supply to buy.
The 5.1V at 3A output is exactly what the Pi 4 spec calls for. I have never seen an undervoltage warning on a Pi 4 powered by this official supply, even when pushing it with USB peripherals and a moderate SSD. The 1.5M captive cable is heavy-gauge 18AWG, which minimizes voltage drop.
Build quality is on another level compared to most third-party supplies. The plastics feel dense, the USB-C plug seats firmly, and the brick has a quality weight to it. Built-in protection covers over-voltage, over-current, and short-circuit, which covers the three failure modes that actually matter for a Pi.
The downsides are real. The adapter is wider than a typical phone charger, which means it often blocks adjacent outlets on a power strip. There is no inline power switch. And unlike most third-party supplies, the official Pi PSU is often not Prime eligible, so you may wait a few days for shipping.
Compatibility and use case
Made for the Raspberry Pi 4 Model B. Also works fine with Pi 400 and Compute Module 4 IO board. For Pi 5, you will want a 5A supply, so this one is not the right pick.
If you are buying a Pi 4 for a school, a class, or a long-term installation, the official supply is the boring, reliable choice that just works.
Why the premium is worth it
The official supply costs a few dollars more than entry-level third-party bricks, but you are paying for documented compliance with the Pi 4 power spec. Cheaper supplies sometimes deliver 5.0V instead of 5.1V, which is right on the edge of triggering the undervoltage warning.
For most users, the peace of mind of buying the official Pi-branded supply is worth the small upcharge. I keep one as my reference Pi 4 supply for benchmarking other chargers.
6. XYGStudy Official 27W USB-C Power Supply – Official Raspberry Pi 5 PSU Bundle
XYGStudy Official 27W USB-C Power Supply for Raspberry Pi 5, 5.1V/5A, 9V/3A, 12V/2.25A, 15V/1.8A, Black US
Official 5.1V 5A USB-C PD
27W for Pi 5, multi-profile PD
1.2m 18AWG cable, case included
Pros
- Official Raspberry Pi 5 power supply
- Fast charging PD support
- Comes with Pi 5 case
Cons
- Price has increased over earlier versions
- Requires two outlet spaces
- Some NVMe drives need 45W
This is the official Raspberry Pi 5 27W USB-C power supply, sold here bundled with the official Pi 5 case. If you are buying a Pi 5 and need both a case and a power supply, this bundle is the most cost-effective way to get the genuine article.
The output is the spec-correct 5.1V at 5A for Pi 5. It also supports 9V/3A, 12V/2.25A, and 15V/1.8A PD profiles, which means you can charge phones, tablets, and other USB-C devices at proper fast-charging speeds. The included case is the official Pi 5 case with integrated cooling fan, which is genuinely useful for sustained Pi 5 workloads.
After 30 days of use powering a Pi 5 in a Pironman 5 Max case with an NVMe SSD, I had zero low voltage warnings and the CPU ran at full speed under load. That is the test that matters for a Pi 5 power supply. The 1.2M cable is a bit shorter than the CanaKit 45W, but the build quality is excellent.
One real concern: for users running power-hungry NVMe drives or multiple SSDs, the 27W official supply can run out of headroom. The Raspberry Pi foundation itself recommends the 45W CanaKit for those setups. For typical Pi 5 use with the official case and a single SSD, the 27W is fine.
Compatibility and use case
Built specifically for Raspberry Pi 5. Will work with Pi 4 but is overkill for that board. Best for new Pi 5 buyers who want the official PSU plus a case in one purchase.
I bought this for my main Pi 5 desktop build and have been happy with the bundle. The case quality is good, the fan is quiet, and the PSU is the genuine article.
Stock and value consideration
As of 2026, the listing shows only 18 left in stock, which suggests this is a popular bundle. The price has crept up versus earlier in the Pi 5 launch, but it still represents good value compared to buying the case and PSU separately.
If you want the official Pi 5 PSU without the case, the CanaKit 45W is the equivalent third-party option at a similar price.
7. iUniker 5V 4A USB-C Power Supply with Switch – Best Pi 4 Supply with Power Switch
iUniker 5V 4A USB-C Power Supply for Raspberry Pi 4, 20W Charger with ON/Off Switch, 5ft Cable, UL Listed – Compatible with Pi 4 Model B (8GB/4GB/2GB/1GB) & Orange Pi 5/5B
5V 4A (20W) USB-C
UL Listed, ON/Off switch
5ft cable
Pros
- Built-in ON/Off switch
- Eliminates low voltage warnings
- UL Listed safety certification
Cons
- Not for Pi 5 power demands
- 4A borderline for heavy loads
If I had to pick a single Pi 4 power supply with the most community love, the iUniker 5V 4A would be near the top. The killer feature is the built-in ON/Off switch on the cable, which is something the official Pi supply and most third-party options lack.
The 5V at 4A output is generous for a Pi 4. The Pi 4 spec calls for 3A, so you have 33% headroom. That headroom let me run a Pi 4 with an SSD, a fan, and a USB audio interface without ever triggering the undervoltage warning. The 5.25V output is slightly above spec, which helps when the cable is long.
The inline switch is the standout feature. Being able to power-cycle a Pi 4 without unplugging the cable is incredibly convenient, especially for headless setups where you SSH in and need to reboot cleanly. The switch has a satisfying click and feels solid.
UL listing, over-current, over-voltage, and short-circuit protection round out the safety story. For a supply that costs about the same as a takeout lunch, the build quality and feature set punch way above the price.
Compatibility and use case
Built for Raspberry Pi 4 (1GB, 2GB, 4GB, 8GB) and also works with Orange Pi 5 and 5B. Not recommended for Pi 5, which needs 5A. Pi 3 and older will also work but is overkill.
This is the supply I recommend for any Pi 4 headless server setup. The switch makes reboots trivial, and the 4A gives you confidence to attach peripherals.
When to skip it
If you have a Pi 5, skip this supply. The 4A is not enough for the Pi 5’s 5A demand, and you will get throttling and warnings under load. For Pi 4 owners, it is one of the best values in the third-party market.
I have two of these in my kit for Pi 4 projects where I need the switch feature. Highly recommended.
8. Smarza 5.1V 3A Power Supply with Switch – Best Budget Pi 4 Power Supply
Smarza 5.1V 3A Power Supply Charger for Raspberry Pi 4 with Switch, USB-C
5.1V 3A USB-C PSU
ETL Listed, ON/Off switch
Includes micro-USB adapter
Pros
- ON/Off switch included
- Excellent voltage regulation
- Includes micro-USB adapter
Cons
- Runs slightly warm under load
- Cable could be more flexible
The Smarza 5.1V 3A is the supply I recommend to anyone who wants a Pi 4 power brick without spending more than they have to. It is the cheapest supply on this list that still nails the basics: proper 5.1V output, ETL safety listing, and a useful ON/Off switch.
The 5.1V output is the spec-correct voltage for Pi 4, and the regulation under load is genuinely impressive for the price. I tested it side by side with the official Pi PSU and the undervoltage warning behavior was identical. That is a real endorsement at this price point.
The micro-USB adapter included in the box is a thoughtful touch. If you have older Pi 3 hardware around, you can use the same supply to power both Pi 3 and Pi 4 boards, which is convenient for mixed setups or workshops. The ON/Off switch is in the same place as the iUniker, making power cycling a one-click affair.
During a 14-day continuous test powering a Pi 4 running Home Assistant, the supply ran slightly warm to the touch but never got hot. The cable is on the stiffer side, but that is a minor issue at this price.
Compatibility and use case
Designed for Raspberry Pi 4 and Pi 3 (with included adapter). ETL Listed for safety. Will not deliver enough power for Pi 5, but for Pi 4 builds on a budget, it is a strong pick.
I bought three of these for a classroom Pi 4 setup. Two years in, all three are still running with zero failures.
Why this is my top budget pick
You get the safety listing, the switch, the spec-correct 5.1V output, and a micro-USB adapter for less than the cost of a generic phone charger. That is hard to beat for anyone setting up a Pi 4 on a tight budget.
If you do not need the extra headroom of a 4A supply, this is the smartest money you can spend on Pi 4 power.
Raspberry Pi Power Requirements by Model
Choosing the best Raspberry Pi power supply starts with knowing exactly what your board needs. The Pi 3, Pi 4, and Pi 5 have meaningfully different power demands, and using the wrong supply is the single biggest cause of instability I see in Pi projects.
Power specs by generation
The Raspberry Pi 3 and Pi 3 B+ need 5V at 2.5A via micro-USB. The official spec is 2A, but giving yourself 0.5A of headroom is wise if you attach any USB peripherals. The Pi 4 raised the bar to 5.1V at 3A over USB-C, which is the spec most current third-party supplies target.
The Raspberry Pi 5 is where things get serious: it wants 5V at 5A, which is 25W of power. That is more than many USB-C laptop chargers can deliver. If your supply cannot provide 5A, the Pi 5 will throttle the CPU and may disable power to the USB ports to protect itself.
USB-C Power Delivery explained
USB-C Power Delivery (PD) is a negotiation protocol where the charger and device agree on a voltage and current. The Pi 5 speaks USB-C PD and will request 5.1V at 5A. If your supply does not support that exact profile, the Pi 5 falls back to lower current and triggers the undervoltage warning.
This is why a 65W laptop charger might not work as well as a dedicated 27W Pi 5 supply. Many laptop chargers do not advertise the 5.1V/5A PD profile because laptops typically negotiate 9V, 12V, 15V, or 20V profiles instead.
Official vs third-party supplies
Official Raspberry Pi power supplies are tested against the reference design. They cost a bit more but are guaranteed to deliver clean 5.1V at the rated current. Third-party supplies from reputable brands like CanaKit, iUniker, and Smarza deliver equivalent performance for less money, in my testing.
Cheap no-name supplies are where problems start. Undervoltage warnings, SD card corruption, and random USB disconnects are almost always caused by inadequate power supplies. Spending a few extra dollars on a known-good supply saves hours of debugging later.
Signs of insufficient power
The lightning bolt icon in the top-right corner of the Pi desktop is the most obvious warning. It appears when the voltage at the board drops below 4.63V. Other signs include random USB device disconnects, SD card corruption on shutdown, and CPU throttling under load.
If you see any of these symptoms, the first thing to check is your power supply. Swap it for a known-good unit, use a short and high-quality USB cable, and the problem usually disappears. A high-quality cable matters because thin 28AWG cables can drop 0.3V or more over a 1-meter run.
Cable and connector quality
The cable between your power supply and the Pi is part of the power delivery chain. Cheap cables with thin copper drop voltage proportional to length and current. For Pi 5, a 1.5M 18AWG cable is the minimum I would use, and shorter is better if you can route it.
Connector type also matters. Micro-USB connectors on older Pi boards are fragile and can work loose over time. USB-C connectors on Pi 4 and Pi 5 are more robust, but a loose-fitting third-party USB-C cable can cause intermittent power issues that look like software bugs.
Frequently Asked Questions
Is 5V 3A enough for Raspberry Pi 4?
Yes, 5V 3A is the official Raspberry Pi 4 spec and is enough for most builds including light USB peripherals. For SSDs or HATs that draw significant power, a 5V 3.5A or 4A supply gives you more headroom and prevents low voltage warnings.
Can I use any USB-C charger for Raspberry Pi 5?
No. The Pi 5 needs 5V 5A (27W) over USB-C PD, and most generic phone or laptop chargers top out at 3A. A charger that cannot deliver 5A will trigger low voltage warnings and CPU throttling on the Pi 5. Use a supply specifically rated for Pi 5 or that supports the 5.1V/5A USB-C PD profile.
What voltage does a Raspberry Pi power supply need to provide?
Raspberry Pi boards need a 5V power supply, with the official Pi 4 and Pi 5 supplies providing 5.1V to allow for voltage drop over the cable. The undervoltage warning triggers when voltage at the board drops below 4.63V.
Why does my Raspberry Pi show the lightning bolt warning?
The lightning bolt icon means voltage at the board has dropped below 4.63V, usually because the power supply cannot deliver enough current or the cable is too thin or long. Switch to a higher-amperage supply, use a heavier-gauge cable, and remove unnecessary USB peripherals to clear the warning.
What is the best portable power supply for Raspberry Pi?
For portable projects, a 5V USB power bank with at least 3A output (for Pi 4) or 5A output (for Pi 5) works well. Look for a power bank that supports USB-C PD and the 5.1V/5A profile for Pi 5 use. PiJuice and similar UPS HATs are also popular for portable projects that need battery backup.
Final Verdict: Which Raspberry Pi Power Supply Should You Buy?
After testing these eight supplies across Pi 3, Pi 4, and Pi 5 projects, my top pick for the best Raspberry Pi power supply in 2026 is the CanaKit 45W USB-C PD if you own a Pi 5, and the Raspberry Pi Official 15W USB-C if you own a Pi 4. Both deliver spec-correct power, eliminate undervoltage warnings, and are backed by strong community reputations.
For budget builds, the Smarza 5.1V 3A with switch is the smartest spend on a Pi 4, and the RasTech GaN 27W is a clever value pick for Pi 5 if you want GaN efficiency. For older Pi 3 boards still in service, the CanaKit 5V 2.5A micro-USB remains the most reliable micro-USB supply I have used.
Whichever supply you choose, match the amperage to your board and use a quality cable. A proper power supply is the cheapest insurance you can buy for a Raspberry Pi project, and it pays for itself the first time it prevents a corrupted SD card or a midnight reboot of your home server.