AMS1117 3.3V DIP Module

AMS1117 3.3V Voltage Step-Down Power Supply Module

3 Pin DIP Socket Structure

     The AMS1117 Module DIP 3.3V is a small linear (LDO) regulator board that steps a 4.5V - 12V DC input down to a fixed 3.3V output. The blue board of about 12mm x 9mm carries the AMS1117-3.3 regulator, the input and output capacitors and a red power LED; it needs no external components. At 5V input it delivers up to 800mA output current.

     Connection is made through the 3-pin right angle (90 degree) pin header on the edge of the board: VIN (input), OUT (3.3V output) and GND. The pins come soldered; the module can be plugged upright into a breadboard or soldered onto a circuit board. It is used to power 3.3V sensors, wireless modules, SD cards and displays from a 5V USB or 5V adapter supply.

     Because it is a linear regulator, the voltage difference between input and output turns into heat. As the input voltage rises, the current it can supply decreases: it works most efficiently at 5V input, while at 9V and 12V input it suits only low current loads.

Key features:

     Fixed 3.3V output: The AMS1117-3.3 regulator keeps the output fixed at 3.3V; line regulation is at most 0.2% and load regulation at most 0.4%. No adjustment is needed.

     Ready board, no external parts: The input and output capacitors are mounted on the board; it is ready to use as soon as VIN, OUT and GND are connected.

     Very small size: The board of about 12mm x 9mm with its right angle header takes very little space on a breadboard and in narrow enclosures.

     Power LED: The red LED lights when the board is powered, so the supply status is visible at a glance.

     Built-in protection: The AMS1117 has current limiting and over-temperature protection; under overload the regulator shuts itself down and restarts when it cools.

Features:

• Product type: AMS1117-3.3 linear (LDO) voltage step-down regulator module
• Model: AMS1117 Module DIP 3.3V
• Input voltage: 4.5V - 12V DC (5V recommended)
• Output voltage: 3.3V fixed
• Output current: up to 800mA (at 5V input); about 500mA recommended for continuous use
• Current at higher input: about 200mA at 9V input, about 75mA at 12V input
• Dropout voltage: typical 1.1V, at most 1.3V at 800mA; full current may not be available at 4.5V input, use a 5V supply for full current
• Line regulation: at most 0.2%
• Load regulation: at most 0.4%
• Protection: Current limiting and over-temperature protection (inside the AMS1117)
• On-board parts: Input and output capacitors mounted; no external components needed
• Indicator: Red power LED
• Connection: 3-pin right angle (90 degree) pin header: VIN, OUT, GND; pins soldered
• Use: Can be plugged into a breadboard or soldered onto a circuit board
• Color: Blue board
• Dimensions: about 12mm x 9mm (excluding pins)

Usage information:

• Connect the VIN pin to the positive of a 4.5V - 12V DC supply (5V is best) and the GND pin to the negative. Take the 3.3V output from the OUT pin; connect the GND of the load to the GND pin of the module.
• Choose the load current according to the input voltage: up to about 500mA continuous at 5V input; about 200mA at 9V and about 75mA at 12V input. At higher current the regulator heats up and the thermal protection cuts the output.
• At high current, voltage drops on thin jumper wires; use short and thick wires, especially on the output side.

Application areas:

•  Powering 3.3V sensor modules
•  3.3V supply for Bluetooth modules (such as HC-05, HM-10)
•  Wireless communication modules (such as nRF24L01, LoRa)
•  RFID reader modules (such as RC522)
•  SD card modules
•  3.3V OLED and TFT displays
•  GPS modules
•  Powering 3.3V microcontroller boards and circuits
•  Creating a separate 3.3V rail next to the 5V rail on a breadboard
•  3.3V need in 5V USB powered circuits

Things to consider:

•  It is a linear regulator; the difference between input and output turns into heat. At 5V input and 500mA the regulator heats to about 95°C, and at 800mA the thermal protection steps in after a few minutes. Limit the continuous load to about 500mA; do not touch the hot regulator.
•  The input must be at least 4.5V. With a single 3.7V lithium cell or a source close to 3.3V the module cannot supply 3.3V; this module does not step voltage up.
•  Do not apply more than 12V input. Do not connect VIN and GND in reverse; reverse connection damages the module.
•  With loads that draw high peak current, such as wireless modules and motors, the total current must not exceed 800mA; for larger loads use a switching (buck) step-down converter.

Package contents:

•  1 Piece AMS1117 3.3V DIP Module
•  1 Piece 3-pin right angle pin header ( Assembled )
•  Note: Breadboard, jumper wires and power adapter are not included in the package.