7805 PDF Datasheet – 5V, Voltage Regulator

Part Number: 7805

Function: 5V, Voltage Regulator

Package: TO-220, TO-3 Can type

Manufacturer: National Semiconductor


7805 regulator



7805 is 5V, Voltage Regulator. A voltage regulator is an electronic circuit that maintains a constant voltage level. It is designed to provide a stable output voltage that is independent of the changes in input voltage, load current, temperature, and other environmental conditions.

Voltage regulators are used in a variety of applications, including power supplies for electronic devices, battery charging systems, and voltage stabilizationization for sensitive equipment. They help protect the devices from damage due to voltage fluctuations or overloading, and ensure that the devices receive a consistent, reliable power source.

The LM78XX series of three terminal regulators is available with several fixed output voltages making them useful in a wide range of applications. One of these is local on card regulation, eliminating the distribution problems associated with single point regulation. The voltages available allow these regulators to be used in logic systems, instrumentation, HiFi, and other solid state electronic equipment. Although designed primarily as fixed voltage regulators these devices can be used with external components to obtain adjustable voltages and currents. The LM78XX series is available in an aluminum TO-3 package which will allow over 1.0A load current if adequate heat sinking is provided. Current limiting is included to limit the peak output current to a safe value.

7805 pinout datasheet

Safe area protection for the output transistor is provided to limit internal power dissipation. If internal power dissipation becomes too high for the heat sinking provided, the thermal shutdown circuit takes over preventing the IC from overheating. Considerable effort was expanded to make the LM78XX series of regulators easy to use and minimize the number of external components. It is not necessary to bypass the out- put, although this does improve transient response. Input bypassing is needed only if the regulator is located far from the filter capacitor of the power supply. For output voltage other than 5V, 12V and 15V the LM117 series provides an output voltage range from 1.2V to 57V.

7805 block diagram


1. Output current in excess of 1A

2. Internal thermal overload protection

3. No external components required

4. Output transistor safe area protection

5. Internal short circuit current limit

7805 PDF Datasheet