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AMS1117 DC 3.3V Regulator Module


The AMS1117-3.3 Module is a voltage-regulated power supply circuit board, which can convert an input voltage range of 4.3V to 12V DC to a fixed positive 3.3V DC output at 1A of current.

This module comes with overheat and short circuit protection functions.

It can serve as an additional power supply for various electronic components such as Arduino boards, sensors, high efficiency linear regulators, and charging modules. It can also be used to power LEDs (up to a maximum of 3 watts).

These module price typically ranged from $0.25 to $2.5, depending on the supplier and quantity purchased. It's always a good idea to compare prices from different suppliers to find the best deal.

This article will provide detailed information about linear regulator AMS1117-3.3 module, including specifications, circuit diagrams, working explanation, applications, and more. Let's get started!

Specifications of AMS1117-3.3 Module

The quick specifications of the 3.3V regulator module is given below,

  • Type: Voltage Regulator
  • Model: AMS1117-DC-3V3
  • Input Voltage Type: DC
  • Input Voltage Range: 4.3-15V
  • Input Current: 1A
  • Output Voltage Type: DC
  • Output Voltage: Fixed +3.3V
  • Line Regulation: 0.2% to 0.4%
  • Output Current: 1A
  • Temperature Range: –40°C to +125°C
  • Dimentsions: 6 x 3 x 1 CM
  • Wight: 6gm

AMS1117-3.3 Module Circuit Diagram

Schematic of the ams1117 dc 3.3v regulator module circuit is shown below.


Components are used - U1: IC AMS1117-3.3, C1 & C3: 10uF Ceramic Capacitor, C2 & C4: 1uF Ceramic Capacitor, R1: 1kΩ Resistor, and D1: SMD LED.

Working Principle of AMS1117-3.3 Module

The main component of this regulated power supply module circuit is the AMS1117-3.3, which is a positive voltage regulator IC. This specific variant of the AMS1117 series is designed to provide a fixed output voltage of 3.3V. Its working principle involves regulating the input voltage and maintaining a constant output voltage.

When the circuit receives an input voltage that is higher than the desired output voltage (such as 5V or 12V at 1A DC), ceramic capacitors (C1 & C2) connected between the Vin pin and the GND (ground) pin of the IC (U1) help stabilize the input voltage and filter out any noise or voltage fluctuations.

The voltage regulator IC (U1) then takes the input voltage and regulates it to a constant +3.3V DC output. If there is any excess voltage beyond 3.3V, it is dissipated as heat through the circuit board.

To ensure a stable and clean DC 3.3V output, ceramic capacitors (C3 & C4) are used to further filter any remaining noise from the output voltage.

Additionally, a power-on indicator LED (D1) is connected between the Vout pin and ground through a series resistor (R1). This arrangement allows the LED to be powered by the regulated output voltage, serving as a visual indicator that the power supply is operational.

Application of AMS1117-3.3 Module

  • 5V to 3.3V Linear Regulator,
  • Battery-powered instrumentation,
  • High Efficiency Linear Regulators,
  • Power Management for Notebook,
  • Post Regulators for Switching Supplies,
  • Battery Chargers,
  • Active SCSI Terminators,
  • Motor control circuits.

Frequently Asked Question (FAQs)

After reading this article, you may have some questions, which will be discussed below.

What is the input voltage range for this Regulator Module? The input voltage range typically supported by the AMS1117-3.3 module is around 4.3V to 12V. It is important to ensure that the input voltage stays within this range to ensure proper functionality.
What is the output voltage of this Regulator Module? The AMS1117-3.3 voltage regulator module is specifically designed to provide a regulated output voltage of 3.3V.
What is the maximum input current that the Module can handle? The maximum input current that the AMS1117-3.3 module can handle up to 1 Amp.
Does this module require external components for operation? Yes, the AMS1117-3.3 module typically requires input and output capacitors to ensure stable and noise-free operation. These capacitors (such as ceramic capacitors) are commonly connected between the Vin and GND pins, as well as the Vout and GND pins of the module.
Can It handle input voltages higher than 12V? While the typical recommended maximum input voltage for the AMS1117-3.3 module is 12V, but it can handle higher input voltages up to 18V at 1A.
Does this Regulator Module have built-in protection features?

Yes, the AMS1117-3.3 module typically includes built-in protection features such as overcurrent and thermal shutdown. These features help protect the module from excessive current or temperature conditions, enhancing its reliability.

Can I use this module to power other voltage-dependent components? This AMS1117-3.3 module is specifically designed to provide a regulated 3.3V output. It is best suited for powering components that require a 3.3V power supply. If you need to power components requiring different voltage levels, you may need separate voltage regulator modules or voltage conversion techniques.

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