LM7805 Voltage Regulator: A Perfect Regulator in a Circuit



The LM7805 voltage regulator is a widely used integrated circuit (IC) designed to provide a regulated and stable output voltage of +5 volts. It has gained immense popularity in various electronic circuits and systems due to its simplicity, reliability, and ease of use.

LM7805 Voltage Regulator: Features, Applications & Datasheet

In this guide, we will delve into the functionality, features, and applications of the LM7805 voltage regulator, providing you with a comprehensive understanding of this essential component.

Overview of LM7805 Voltage Regulator:

The LM7805 is part of the LM78xx series of voltage regulators, with each number representing a different output voltage. The “05” in LM7805 indicates the regulated output voltage of +5 volts. This series is based on the linear voltage regulator concept, which utilizes a series pass transistor and negative feedback to maintain a constant output voltage regardless of input voltage variations.

Functionality and Features:

The LM7805 voltage regulator operates by comparing the output voltage with an internal reference voltage and adjusting the pass transistor accordingly. Its primary function is to regulate the voltage supplied to electronic devices, ensuring they receive a stable and constant +5V DC power source. Here are some key features of the LM7805:

Input and Output Voltage Range: The LM7805 can accept an input voltage range from 7 volts to 35 volts, making it compatible with various power sources.

Regulated Output Voltage: It provides a constant +5 volts DC output voltage with a tolerance of ±5%.

Current Handling Capacity: The LM7805 is capable of delivering a maximum output current of 1 ampere, making it suitable for powering a wide range of low to moderate power applications.

Thermal Protection: It includes built-in thermal shutdown and current limiting features to protect the regulator from excessive heat and overcurrent conditions.

Easy-to-Use Package: The LM7805 is available in a standard TO-220 package, which offers convenient mounting and heat dissipation capabilities.

Applications of LM7805 Voltage Regulator

Due to its versatility and robust design, the LM7805 finds applications in numerous electronic circuits and systems. Some common use cases include:

Power Supply for Digital Electronics: The LM7805 is widely employed in microcontroller-based systems, digital logic circuits, and other digital electronics where a stable +5V power source is required.

Arduino Projects: Hobbyists and makers often use the LM7805 to power Arduino boards and other microcontroller projects.

Battery Charging Circuits: It is utilized in charging circuits to maintain a constant voltage during battery charging processes.

Instrumentation and Measurement Systems: The LM7805 is an integral part of precision measurement systems, providing stable reference voltages for accurate readings.

Automotive Electronics: The voltage regulator is also used in automotive applications to ensure a steady power supply for various components.

Equivalent of lm7805 voltage regulator

There are several equivalent voltage regulators available in the market that can serve as alternatives to the LM7805. Some commonly used equivalents include:

L78M05: The L78M05 is a positive voltage regulator with a fixed output voltage of +5 volts. It shares similar electrical characteristics and pin configuration with the LM7805, making it a suitable replacement.

UA7805: The UA7805 is another popular voltage regulator that provides a regulated +5 volts output. It is designed to have compatible specifications and pin assignments, making it a viable substitute for the LM7805.

KA7805: The KA7805 is a three-terminal voltage regulator that also delivers a regulated output voltage of +5 volts. It exhibits comparable performance characteristics to the LM7805 and can be used interchangeably in many applications.

MC7805: The MC7805 is a series of positive voltage regulators, with the MC7805CT being the equivalent to the LM7805. It offers a regulated +5 volts output and can replace the LM7805 in most circuits requiring a 5-volt power supply.

AMS1117-5.0: The AMS1117-5.0 is a low dropout voltage regulator that provides a fixed output voltage of +5 volts. It is a suitable alternative to the LM7805, particularly in applications where low dropout voltage and compact size are desired.

These equivalent voltage regulators are widely available and can serve as direct replacements for the LM7805 in various electronic projects and applications. However, it is essential to review the datasheets and specifications of the specific regulator to ensure compatibility and suitability for your specific requirements.


The LM7805 voltage regulator is a reliable and widely adopted solution for achieving stable and regulated +5V DC output voltage. Its simplicity, broad input voltage range, and high current handling capacity make it an ideal choice for a multitude of electronic applications. Whether you are working on a hobby project or a commercial system, the LM7805 provides the necessary voltage regulation to power your devices effectively.

By understanding the functionalities, features, and applications of the LM7805 voltage regulator, you can leverage its capabilities to optimize the performance and reliability of your electronic circuits and systems.

Subscribe to our Newsletter “Electrical Insights Daily” to get the latest updates in Electrical Engineering. You can also Follow us LinkedIn to see our latest posts.

Sharing is Caring

Similar Posts

Leave a Reply

Your email address will not be published. Required fields are marked *