Item specifics
Description
AMS1117 3.3V Power Supply Module Product Overview
The AMS1117 3.3V power supply module is a compact step‑down linear regulator based on the AMS1117 chip, converting a 4.5V‑7V DC input to a stable 3.3V output with up to 800mA current. The double‑sided PCB includes a red power LED, 2‑pin input/output headers, and mounting holes, measuring only 2.5×1.1cm. It is ideal for supplying 3.3V to Arduino, STM32, ESP8266, ESP32, sensors, and other low‑power devices.
AMS1117 3.3V Power Supply Module Core Features
Linear Regulated Output： AMS1117‑3.3 chip, 3.3V output, 800mA max.
Wide Input Voltage： DC 4.5V‑7V (must be at least 1V higher than output).
Compact Size： Double‑sided PCB, 2.5×1.1cm.
Mounting Holes： Two holes for fixing on breadboards or prototype boards.
Power LED： Red indicator lights when powered.
Simple Interface： 2‑pin single row headers for input and output.
AMS1117 3.3V Power Supply Module Applications
MCU Power Supply： Provide 3.3V for ESP8266, STM32, sensors, etc.
Arduino Expansion： Step down 5V/6V to 3.3V for peripheral circuits.
Breadboard Experiments： Compact size fits into breadboards or test boards.
DIY Projects： Supply 3.3V to logic circuits, sensors, wireless modules.
AMS1117 3.3V Power Supply Module Key Advantages
The AMS1117 3.3V module delivers stable 3.3V at very low cost, making it one of the most commonly used power solutions in electronics. Linear regulators offer low output ripple and simple circuitry, ideal for noise‑sensitive applications. Onboard mounting holes and standard headers allow plug‑and‑play use. Its small footprint fits into compact projects, and the red LED provides clear power status. Input voltage range covers common 5V USB and two‑cell Li‑ion (6V), making it an essential power accessory for Arduino and IoT beginners.
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FAQ:
What is the AMS1117 3.3V power supply module and what does it do?
The AMS1117 3.3V module is a compact step‑down linear voltage regulator board built around the AMS1117-3.3 IC. It converts an input voltage between 4.5V and 7V down to a stable 3.3V output, with a maximum current of 800 mA. It is commonly used to power 3.3V microcontrollers, sensors, and logic circuits from a 5V USB supply or a 2‑cell Li‑ion battery.
What is the maximum input voltage I can apply to this AMS1117 module?
The AMS1117 itself can withstand up to 15V, but this specific module is specified for an input range of 4.5V to 7V. Exceeding 7V may cause the regulator to overheat and shut down at high output currents. For reliable operation and to keep the power dissipation within safe limits, stick to a 5V or 6V input.
How much current can the AMS1117 3.3V module really deliver, and why does it get so hot?
The chip is rated for 800 mA of output current, but actual thermal performance depends heavily on the input voltage and heatsinking. Since it is a linear regulator, the excess voltage is burned off as heat: P = (VIN – VOUT) × I. With a 5V input and a 500 mA load, about 0.85W is dissipated, making the module warm. At 800 mA with a 7V input, it will be very hot and may trigger thermal protection. Adding a small heatsink helps, but for high currents consider a switching converter instead.
Is the AMS1117 3.3V module suitable for battery‑powered projects? How efficient is it?
Efficiency of a linear regulator equals VOUT/VIN, so at 5V input it is roughly 66%, meaning 34% of the power is wasted as heat. For battery‑powered designs, this is usually not a good choice because it drains the battery faster. A switching (buck) converter with 85‑95% efficiency is preferred for extended runtime. The AMS1117 is better suited for mains‑powered or USB‑powered projects where heat can be managed and noise must be minimal.
How do I use the AMS1117 3.3V module? What external capacitors are needed?
The module usually includes the required input and output capacitors—typically a 10 µF tantalum or electrolytic on the input and a 22 µF on the output for stability. You only need to connect your power source to IN+ / IN‑ and your load to OUT+ / OUT‑. The built‑in protection diodes and current limiting make it very beginner‑friendly.
What are the advantages of using the AMS1117 over a switching regulator for a 3.3V rail?
The AMS1117 produces extremely low output noise and ripple (typically a few tens of millivolts), making it ideal for sensitive analog circuits, audio amplifiers, and precision ADC references. It also requires only two external capacitors and occupies minimal board space. Unlike switching regulators, it generates no high‑frequency EMI, so it is preferred in radio‑frequency and measurement applications.
Can I power the AMS1117 3.3V module directly from a Li‑ion battery (3.7‑4.2V)?
No, because the regulator requires a minimum input voltage of about 4.5V (the dropout voltage of the AMS1117 is typically 1.1‑1.3V). A fully charged Li‑ion cell (4.2V) cannot maintain the 3.3V output under load. You would need a boost converter or a low‑dropout (LDO) regulator with a smaller dropout voltage.
Why does my AMS1117 module output a voltage slightly different from 3.3V when no load is connected?
A small voltage fluctuation (e.g., 3.27–3.33V) under no‑load conditions is normal and within the ±1%‑±2% tolerance. The output voltage is internally fixed and cannot be adjusted. If the voltage drops significantly under load, check that the input voltage stays above 4.5V and that the wires are thick enough to handle the current.
Does the AMS1117 module have over‑current or thermal protection?
The AMS1117 chip incorporates internal current limiting and thermal overload protection. If the junction temperature exceeds about 150°C, the regulator will reduce its output current or shut down completely until it cools. This prevents permanent damage, but it should not be relied upon for continuous operation; adequate heatsinking should always be provided.
What are the most common uses for the AMS1117 3.3V linear regulator module?
It is widely used to power 3.3V Arduino boards, ESP8266/ESP32 modules, Raspberry Pi Pico, nRF24L01 radio modules, and simple sensor circuits from a 5V USB wall adapter or a regulated 5V bench supply. Its low noise, small size, and ease of use make it a staple in breadboard prototyping and low‑current embedded systems.