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Your cart is empty.4.3 out of 5 stars
- #96,844 in Tools & Home Improvement (See Top 100 in Tools & Home Improvement)
- #339 in Power Converters
10PCS/Lot AMS1117-3.3 DC-DC Step-Down Power Module AMS1117-3.3V Buck Module LDO 800MA
Description:
Size:
approx. 8.6mm x 12.33mm
Input voltage: DC 4.2 V-10 V
Output: 3.3 V, 800 mA
Phillip
Reviewed in the United States on June 7, 2025
Worked as it should
D. Hall
Reviewed in the United States on May 30, 2025
The first three of these out of the packaging all were defective. They were passing the full input voltage (12v) through the "output" pin, instead of the specified three volts. Yes, I read the datasheet and verified that the pinout marked on the circuit board was both correct and correctly wired.Fortunately I was testing them on the bench before hooking them up to anything sensitive--the 3v circuit I planned to power with these would have been instantly fried. With this rate of failure, I'm not going to bother opening the other handful... even if they worked at first, I don't think I'd be willing to trust they'd last or not catastrophically fail because of the obviously poor quality control.
Bill
Reviewed in the United States on May 16, 2025
This is described in the ad as a buck regulator. Looking at the mfg. data sheet, this is untrue. This is a linear 3-pin regulator, not a buck regulator. If you look at the picture you will not see a coil, needed for a buck regulator.That being said, these little guys work great. I have a project using an Esp32S3 , display and an I2S DAC amplifier. The 3.3v regulator was not up to the challenge. Audio output would sometimes cause a reset. I put the regulator between the dev boards 5v line and the audio boards 3.3v input. Problem solved.
stvrdl
Reviewed in the United States on June 2, 2024
They work as expected.
Dean Koepke
Reviewed in the United States on April 6, 2024
These work.
Julie W.
Reviewed in Australia on April 25, 2024
Nice little step down modules for USB 5v to 3.3v DC
Sparky
Reviewed in Canada on April 27, 2023
Good product
ATX
Reviewed in the United States on February 22, 2021
This is the same linear voltage regulator that is used on the NodeMCU board to power the ESP8266 with 3.3V from Vin. I use this little board to power electronics that need to communicate with the ESP8266 at 3.3V if they are placed in another enclosure far apart or if the current requirements are too high. The PCB construction is sturdy and the form factor is small enough. The on-board LED gives good feedback so you know when the unit is on, but you may want to remove it if you're running off a battery and want to save power.
Peter
Reviewed in the United States on December 21, 2020
These worked perfectly to drop 5v to 3.3v. I suspect the negative reviewer did not hook it up properly. The pinout is different from a standard 78xx TO-220 package LDO. Left to right on the side with the LED and pins, the pinout is Vin, Vout, Gnd.
natataka
Reviewed in the United States on October 9, 2020
used this to covert 5v-3.3v for my weather radio than ran on AAA batteries. used a spare usb cut ends attach this step down and connected to radio terminals. was able to fit the module inside the battery case.
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