AMS1117 Voltage Regulator Module (3.3V / 5V)

AMS1117 Voltage Regulator Module (3.3V / 5V) – Overview

The AMS1117 Voltage Regulator Module is a compact, reliable power solution built around the AMS1117 linear regulator IC. Available in fixed 3.3V or fixed 5V versions, this module steps down higher DC voltages to a clean, regulated output suitable for microcontrollers, sensors, and small electronic modules. Its LDO (low dropout) design and onboard capacitors provide stable performance for prototyping and embedded systems.

Key Features

• Selectable versions: 3.3V or 5V fixed output
• Low dropout regulator (LDO) delivers steady voltage with minimal input-output differential
• Input voltage range: typically 4.5V to 12V DC (varies by load and module version)
• Output current: up to 800mA depending on heat dissipation and ambient cooling
• Compact, breadboard-friendly PCB footprint for easy prototyping
• Built-in input and output capacitors to reduce ripple and improve transient response

Specifications

• Regulator IC: AMS1117 (linear LDO)
• Output voltage: 3.3V or 5V (fixed, depending on module version)
• Input voltage: typically 4.5V to 12V DC; ensure input is higher than output plus dropout voltage
• Maximum output current: up to 800mA (recommend lower continuous currents unless heat-sinked)
• Onboard capacitors: yes (input and output capacitors for stability)
• PCB: compact and breadboard-compatible

Applications

• Power supply for Arduino, ESP8266, ESP32, and Raspberry Pi modules and add-ons
• Regulated supply for sensors, wireless modules, and small motors
• DIY electronics, prototyping, and embedded system projects
• Robotics, battery-powered circuits, and single-board computer peripherals

How to Use

1. Confirm the module version (3.3V or 5V) before connecting to your device.
2. Supply a DC input voltage that is higher than the chosen output plus the AMS1117 dropout (typically ensure at least 1V margin).
3. Connect input + and ground to your power source, and take regulated output from the module’s output pins.
4. For higher continuous currents, provide adequate cooling or a heatsink to avoid thermal shutdown.
5. Double-check polarity and voltage to protect sensitive microcontrollers and sensors.

Thermal and Safety Tips

• The AMS1117 is a linear regulator; power dissipation increases with input-output voltage difference and current. Minimize excess input voltage when drawing higher currents.
• At currents approaching 800mA the module can become hot. Use a heatsink or ensure airflow for sustained loads.
• Avoid connecting the wrong voltage version to boards that expect a specific rail voltage; verify 3.3V vs 5V before powering sensitive devices.

Compatibility and Prototyping Tips

• Breadboard-friendly pin spacing makes this module ideal for rapid prototyping.
• Works seamlessly with Arduino, ESP8266, ESP32, Raspberry Pi HATs and small sensor modules when correct voltage is selected.
• Use decoupling capacitors close to the powered module or sensor for best transient performance.

Note: Images are for illustration purposes only. Verify module version and connections before use.