LD1117S33TR STMicroelectronics IC REG LINEAR 3.3V 800MA SOT223

The LD1117S33TR from STMicroelectronics is a popular linear voltage regulator integrated circuit (IC) that provides a fixed output voltage of 3.3 volts and a maximum output current of 800mA. Here is an overview of the LD1117S33TR detailing its key features, application areas, and specifications:


LD1117S33TR Overview:

  • Manufacturer: STMicroelectronics
  • IC Type: Linear Voltage Regulator
  • Package: SOT-223 (Surface-Mounted Device Package with 3 pins)
  • Output Voltage: 3.3 volts
  • Output Current: Up to 800mA
  • Dropout Voltage: Typically around 1.2 volts
  • Thermal Shutdown: Yes
  • Short Circuit Protection: Yes
  • Adjustment: Fixed 3.3V output voltage
  • DataSheet LD1117S33TR PDF

Key Features:

  • Fixed Output Voltage: Provides a stable 3.3V output voltage irrespective of input voltage variations.
  • Output Current Capacity: Capable of supplying up to 800mA of current, suitable for powering various logic circuits, microcontrollers, sensors, and small peripheral devices.
  • Low Dropout Voltage: Works effectively even when there is a small voltage discrepancy between the input and output.
  • Thermal Shutdown: Protects the IC from overheating by shutting down when temperatures exceed safe limits.
  • Short Circuit Protection: Safeguards the regulator and connected load in case of a short circuit.

Application Areas:

  • Microcontroller Systems: Used for providing a stable power source to microcontrollers and associated peripherals.
  • Digital Logic Circuits: Ideal for powering digital components requiring a 3.3V supply voltage.
  • Sensor Interfaces: Provides a regulated voltage for sensor circuits in various applications.
  • Embedded Systems: Commonly employed in embedded systems and IoT devices for power regulation.

Working Principle:

  • The LD1117S33TR regulates the output voltage by comparing a reference voltage with the feedback signal.
  • It adjusts the internal components to maintain a stable output voltage of 3.3V.
  • Any excess power is dissipated as heat when the input voltage is higher than the output voltage to regulate the output voltage effectively.


  • The LD1117S33TR is a reliable and popular choice for applications requiring a fixed 3.3V power source with moderate current demands.
  • Heat dissipation may be necessary depending on the application and current requirements to ensure stable operation.

The LD1117S33TR from STMicroelectronics serves as a fundamental component in the realm of electronics, furnishing a consistent and regulated power source to various circuits and systems. It is prudent to refer to the official datasheet for detailed information on operating conditions, heat considerations, and recommendations for integrating the LD1117S33TR into your electronic projects.

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