AMS1117-3.3V DC-DC Step-Down Power Module, LDO 800MA Buck Converter

Need a dependable 3.3V rail for your next microelectronics project without the hassle of designing a custom power circuit? The AMS1117-3.3V LDO Step-Down Power Module provides a rock-solid, low-noise voltage supply in an ultra-small footprint.

Unlike bare regulator chips that require manual calculation and soldering of external decoupling capacitors to prevent voltage ripple, this breakout board comes completely pre-assembled. It features dual-stage filtering capacitors pre-soldered directly to the PCB, ensuring your sensitive microcontrollers receive smooth, spike-free power right out of the box.

Designed for Rapid Prototyping

With standard 2.54mm (0.1") pitch pin headers, this buck-style module slots effortlessly into standard breadboards, stripboards, or female jumper wires. It also includes an integrated red LED power indicator, giving you instant visual confirmation that your circuit is active and receiving juice. It is an indispensable tool for powering modern IoT hardware that demands a clean 3.3V environment.

Key Features & Benefits

• Plug-and-Play Breakout: Skips the breadboard clutter. Includes onboard filtering capacitors for maximum voltage stabilization without extra components.
• 800mA Current Capacity: Delivers up to 800mA of output current—more than enough to handle the peak transmission spikes of power-hungry Wi-Fi and Bluetooth modules.
• Onboard Power LED: Features a bright, integrated red LED indicator for effortless power-state diagnostics.
• Breadboard Friendly: Pre-soldered with standard 4-pin row headers ($2.54\text{mm}$ pitch) for instant integration into prototyping environments.
• Safe & Stable: The underlying AMS1117 architecture includes built-in thermal shutdown and short-circuit current limiting protection circuitry.

Specifications

Pinout Configuration

The module features a simple, clearly labeled 4-pin interface (2 inputs, 2 outputs):

1. VOUT (+): Regulated 3.3V DC Output

2. GND (-): Common Ground / Negative Terminal

3. VIN (+): Unregulated Input Voltage (4.5V – 7V)

What's in the box?

1 x AMS1117-3.3V DC-DC Step-Down Power Module

Resources

Pro-Tips & Usage Notes for Makers

• Mind the Heat: Because this is a linear LDO regulator (not a switching buck converter), it drops excess voltage by converting it into heat. For continuous high-current applications (above 400mA) or when feeding it a maximum 7V input, ensure the module has decent airflow to prevent thermal throttling.
• Ideal Application: This is the gold standard companion module for dropping standard 5V USB power down to 3.3V to safely run an ESP8266 (NodeMCU), ESP32, Raspberry Pi Pico, or standard 3.3V I2C display panels.