LM7805CT: Overview,Specifications,Main uses,Features,application fields,working principle and alternative models

LM7805CT Overview:

The LM7805CT is a widely used linear voltage regulator IC that provides a fixed output voltage of +5 volts. Below is an overview, specifications, main uses, features, application fields, working principle, and alternative models of the LM7805CT:



  • Manufacturer: Texas Instruments, ON Semiconductor, STMicroelectronics, etc.
  • IC Type: Positive Voltage Regulator
  • Package: TO-220, TO-220FP, TO-220-3
  • Output Voltage: +5 volts
  • Input Voltage Range: Typically up to 35 volts
  • Output Current: Up to 1A
  • Dropout Voltage: Typically 2 volts
  • Thermal Shutdown: Yes
  • Short Circuit Protection: Yes
  • DataSheet LM7805CT PDF

Main Uses:

  • Power Supply Regulation: Commonly used to provide a stable +5V output for powering digital ICs, microcontrollers, sensors, and other components.
  • Voltage Regulation: Acts as a post-regulator to provide a stable voltage from a higher unregulated supply.
  • Battery Charging Circuits: Utilized for charging circuits that require a stable voltage source.
  • Voltage Reference: Offers a fixed +5V reference voltage for various applications.


  • Fixed Output Voltage: Provides a stable +5V output regardless of variations in the input voltage or load current.
  • Thermal Shutdown: Protects the IC from overheating by shutting down if the temperature exceeds safe limits.
  • Short Circuit Protection: Safeguards the regulator and the load from damage in case of a short circuit.
  • Low Dropout Voltage: Operates efficiently even when there is a small voltage difference between the input and the output.

Application Fields:

  • Embedded Systems: Used to power microcontrollers, sensors, and other digital components in embedded systems.
  • Consumer Electronics: Found in various consumer electronic devices as a power regulator.
  • Automotive Electronics: Utilized in automotive circuits for regulating voltages in various systems.
  • DIY Electronics: Popular in hobbyist projects due to its ease of use and reliability.

Working Principle:

  • The LM7805CT operates by comparing a portion of the output voltage to a reference voltage and using feedback to keep the output stable at +5V.
  • When the input voltage is within the proper range, the regulator adjusts its internal components to maintain the output voltage at the desired level.
  • It dissipates excess power as heat when the input voltage is higher than the output voltage to provide a regulated output.

Alternative Models:

  • LM7806: Provides a fixed +6V output.
  • LM7812: Offers a fixed +12V output.
  • LM317: Adjustable voltage regulator capable of providing variable output voltages.


  • The LM7805CT is a fundamental component in electronics for providing stable and regulated power supplies.
  • Heat sinking may be necessary when using the LM7805CT in high-current or high-power applications to ensure proper heat dissipation.

Always refer to the datasheet for the specific model of the LM7805CT for detailed information on operating conditions, thermal considerations, and application guidelines when incorporating it into your electronic circuits.

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