L7805 Voltage Regulator: Pinout, Datasheet, Features and Circuits

What is L7805 IC?

The L7805 is a voltage regulator IC (Integrated Circuit) that is widely used in electronic circuits to provide a stable and regulated 5-volt DC output voltage. It is part of the L78xx series of voltage regulators, with each member of the series having a specific output voltage.

The L7805 is a member of the L78xx series of three-terminal positive voltage regulators. These regulators are available in various packages, including TO-220, TO-220FP, TO3, D²PAK, and DPAK, and come in multiple fixed output voltages, making them versatile for a wide range of applications.

These regulators excel at providing localized on-card voltage regulation, which eliminates the issues associated with centralized single-point regulation. Each type of L78xx regulator incorporates features such as internal current limiting, thermal shut-down, and safe area protection, making them highly robust and effectively indestructible under normal operating conditions.

When appropriately heat-sinked, these regulators can deliver a stable output current of over 1 ampere, making them suitable for powering various electronic components and devices. While primarily designed as fixed voltage regulators, these devices can also be configured with external components to achieve adjustable output voltages and currents, providing additional flexibility for specific application requirements.

L7805 Pinout Configuration

L7805 2D Model and 3D Model

2D Model

3D Model

L7805 Specifications

Features of L7805 IC

• Supports an output current of up to 1.5 amperes.
• Offers a range of fixed output voltages, including 5V, 6V, 8V, 8.5V, 9V, 12V, 15V, 18V, and 24V.
• Includes thermal overload protection to prevent overheating.
• Provides short circuit protection to safeguard against electrical faults.
• Incorporates output transition SOA (Safe Operating Area) protection.
• Maintains a 2% output voltage tolerance (A version).
• Guaranteed performance in an extended temperature range (A version).

L7805 Alternative IC Recommended

MC7805、UA7805、NCP7805、AP7805、AMS1117、XC6206

Application (How to Use)

The L7805 voltage regulator is widely used in various electronic applications where a stable and regulated 5V power supply is required. 

Powering Microcontrollers and ICs: Many microcontrollers and integrated circuits (ICs) require a 5V power supply to operate. The L7805 is often used to provide a reliable and regulated voltage source for these components.

Arduino Projects: The L7805 is frequently used in Arduino projects to power the microcontroller and other peripherals. It ensures consistent voltage levels for proper operation.

Breadboard Power Supply: DIY electronics enthusiasts often build breadboard power supplies using the L7805 to conveniently power their experimental circuits.

Voltage Conversion: The L7805 can be used to convert higher input voltages (e.g., 9V, 12V) from batteries or power adapters to a 5V output, suitable for various digital and analog circuits.

Mobile Phone Chargers: Some older mobile phone chargers used the L7805 to provide a 5V output to charge the phone's battery.

Battery-Powered Devices: The L7805 can be used in battery-powered devices that require a stable 5V power source, such as portable radios, audio amplifiers, and small lighting systems.

LED Drivers: It can be used to power LEDs and LED displays that require a constant voltage source, ensuring uniform brightness and longevity.

Audio Amplifiers: The L7805 can provide a stable power supply for low-power audio amplifier circuits, preamplifiers, and audio effects units.

Regulating Sensor Power: It's commonly used to provide a regulated voltage to various sensors in electronic projects and systems.

Prototyping and Educational Circuits: In electronics laboratories and educational settings, the L7805 is used for teaching purposes and in various prototype circuits.

Remote Control Systems: It can be used in remote control systems to provide a stable voltage for microcontrollers and RF transmitters.

Low-Power Devices: The L7805 is suitable for low-power devices, such as small motors, fans, and simple control systems.

Block Diagram

Schematic Diagram

L7805 Related Application Circuits

This is a standard application circuit for the 7805 IC. It requires two capacitors with values of 33uF and 0.1uF to ensure proper IC operation.

The 0.33uF input capacitor is a ceramic capacitor designed to address input inductance issues, while the 0.1uF output capacitor, also ceramic, enhances circuit stability. To maximize their effectiveness, it is crucial to place these capacitors in close proximity to the IC's terminals. Additionally, it is recommended to use ceramic capacitors for this application since they offer faster performance compared to electrolytic capacitors.

Test Circuits

DC parameter

Load regulation

Ripple rejection

Datasheet PDF

Learn and download Ripple L7805 datasheet PDF here>>

Manufacturer

STMicroelectronics, often referred to as ST, is one of the well-known manufacturers of the L7805 voltage regulator. STMicroelectronics is a global semiconductor manufacturer headquartered in Geneva, Switzerland. With a rich history of innovation, they produce a wide range of high-quality semiconductor products, including microcontrollers, sensors, analog and digital integrated circuits, and power management devices, serving diverse industries such as automotive, industrial, and consumer electronics. Known for their commitment to research and environmentally responsible practices, STMicroelectronics is a trusted supplier of semiconductor solutions to a global customer base.