AMS1117 3.3V Step-Down Linear Voltage Regulator Power Supply Module

Step down higher DC supply voltages to a stable, low-noise $3.3 ext{V DC}$ output with the AMS1117 3.3V Power Supply Module. Built around the popular AMS1117-3.3 low-dropout (LDO) linear voltage regulator IC in a SOT-223 package, this compact breakout board accepts input voltages ranging from $4.5 ext{V}$ to $12 ext{V DC}$ and delivers up to $800 ext{mA}$ continuous output current. Featuring onboard filtering capacitors, a red power status LED indicator, and standard 2.54mm pitch header pins, it provides clean regulated power for 3.3V microcontrollers like ESP8266, ESP32, STM32, Raspberry Pi Pico, and sensitive wireless sensors.

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Tags AMS1117 3.3V Module 3.3V LDO Voltage Regulator Step Down Power Supply Module AMS1117 Breakout Board 5V to 3.3V Buck Regulator Linear Voltage Regulator 3.3V ESP8266 3.3V Power Supply

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Product Details :

The AMS1117 3.3V Power Supply Module is an essential power conditioning breakout board designed to down-convert higher DC voltages (such as $5 ext{V}$ from USB or $9 ext{V}-12 ext{V}$ from adapters) into a precise $3.3 ext{V DC}$ rail required by modern low-power microcontrollers and sensors.

The core of the module is the AMS1117-3.3 IC, a high-efficiency Low Dropout (LDO) linear regulator capable of providing up to $800 ext{mA}$ output current with a maximum dropout voltage of just $1.1 ext{V}$ at full load. The board includes onboard surface-mount tantalums and ceramic filtering capacitors on both the input ( $V_{IN}$ ) and output ( $V_{OUT}$ ) lines to minimize voltage ripples and ensure signal stability. An onboard red SMD power LED gives immediate visual confirmation when input power is applied. With its dual 2-pin male headers ( $V_{IN}/GND$ and $V_{OUT}/GND$ ), it plugs directly into standard solderless breadboards or PCB headers.

Key Features and Benefits

Precise 3.3V Regulation: Converts unregulated $4.5 ext{V}$ to $12 ext{V DC}$ inputs down to a stable $3.3 ext{V DC}$ output with $pm1%$ accuracy.
Up to 800mA Output Current: Provides sufficient current to power hungry Wi-Fi/Bluetooth modules like ESP8266 ESP-01, ESP32, and NRF24L01 radio transceivers.
Integrated Noise Filtering: Built-in SMD filtering capacitors smooth out line ripple and voltage spikes for sensitive digital logic circuits.
Power Indicator LED: Red SMD LED indicates active power supply status at a glance.
Breadboard Friendly Layout: Standard 2.54mm pitch male pin headers allow seamless mounting on breadboards and prototyping shields.

Technical Specifications

Feature Component	Specification Details
Regulator IC	AMS1117-3.3 (SOT-223 Package)
Input Voltage ( $V_{IN}$ )	$4.5 ext{V DC to } 12.0 ext{V DC}$ ( $5.0 ext{V DC}$ recommended)
Output Voltage ( $V_{OUT}$ )	$3.3 ext{V DC} pm 1.5%$
Max Output Current ( $I_{OUT}$ )	$800 ext{mA}$ (Subject to power dissipation $P_D$ )
Dropout Voltage ( $V_{DO}$ )	$1.1 ext{V}$ at $800 ext{mA}$
Line Regulation	$0.2%$ Max
Load Regulation	$0.4%$ Max
Pin Pitch	$2.54 ext{ mm}$ ( $0.1 ext{ inch}$ )
Operating Temperature	$-40^circ ext{C to } +125^circ ext{C}$

Pinout & Thermal Management Guide

Pin Configuration:

$V_{IN}$ ( $+$ ): Input positive voltage ( $4.5 ext{V} - 12 ext{V DC}$ )
$V_{IN}$ ( $-$ /GND): Input ground ( $0 ext{V}$ )
$V_{OUT}$ ( $+$ ): Regulated output positive ( $3.3 ext{V DC}$ )
$V_{OUT}$ ( $-$ /GND): Output ground ( $0 ext{V}$ , common with input ground)

THERMAL & DISSIPATION ADVISORY: Linear regulators convert excess voltage into heat according to $P_D = (V_{IN} - V_{OUT}) imes I_{OUT}$ . When stepping down from $12 ext{V}$ to $3.3 ext{V}$ , drawing high current ( $>200 ext{mA}$ ) will cause the IC to get hot rapidly. For input voltages above $5 ext{V}$ with currents exceeding $300 ext{mA}$ , ensure adequate ventilation or consider using a switching buck converter instead.

Applications

IoT & Wireless Modules: Supplying clean power to ESP8266, ESP32, NRF24L01, HC-05 Bluetooth, and LoRa radios.
Microcontroller Logic Power: Powering 3.3V boards like STM32 Blue Pill, Raspberry Pi Pico, and Arduino Due.
Sensor Arrays: Stepping down 5V power rails to drive 3.3V sensors (e.g., MPU6050, BME280, SD card modules).
DIY Prototyping: Providing dual power rails ( $5 ext{V}$ and $3.3 ext{V}$ ) on breadboards for mixed-voltage logic projects.