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LM7824 Voltage Regulator

LM7824 is a fixed-voltage integrated-circuit voltage regulator designed for a wide range of applications. The LM7824 voltage regulator provides 24V Positive voltage as output to provide a convenient power source for most TTL components. Although designed primarily as a fixed voltage regulator, but it can be used with external components to obtain adjustable voltage.


LM7824 Pinout Configuration

Pin Number

Pin Name



Input (V+)

Unregulated Input Voltage



Connected to Ground


Output (Vo)

Outputs Regulated +24V


LM7824 Regulator Features

  • 24V Positive Voltage Regulator
  • Minimum Input Voltage is 33V
  • Maximum Input Voltage is 40V
  • Output Current: 1.5 A
  • Internal Thermal Overload and Short circuit current limiting protections are available.
  • Junction Temperature maximum of 125 degree Celsius
  • Available in TO-220, TO-3 and KTE package


Note: Complete Technical details can be found in the 7824 datasheet given at the end of this page.


7824 Voltage Regulator Equivalent

LM7806, LM7809, LM7815, LM7812, LM317, LM7905, LM7912.


Brief Description of LM7824 Voltage Regulator IC

Voltage regulators are very common in electronic circuits. They provide a constant output voltage for a varied input voltage. The name 7824 signifies two meanings, “78” means that it is a positive voltage regulator and “24” means that it provides 24V as output. So our 7824 will provide a +24V output voltage.


The output current of this IC can go up to 1.5A. But the IC suffers from heavy heat loss hence a Heat Sink is recommended for projects that consume more current. For example, if the input voltage is 35V and you are consuming 1A, then (35-5) * 1 = 30W. This 30 Watts will be dissipated as heat.


 LM7824 as +24V Voltage Regulator

This is a typical application circuit of the 7824 IC. We just need two capacitors of value 0.33uf and 0.1uf to get this IC working. The input capacitor 0.33uF is a ceramic capacitor that deals with the input inductance problem and the output capacitor 0.1uF is also a ceramic capacitor that adds to the stability of the circuit. These capacitors should be placed close to the terminals for them to work effectively. Also, they should be of the ceramic type, since ceramic capacitors are faster than electrolytic.

 LM7824 Application Circuit


 LM7824 Applications

  • Constant +24V output regulator to power microcontrollers and sensors in most of the projects
  • Adjustable Output Regulator
  • Current Limiter for certain applications
  • Regulated Dual Supply
  • Output Polarity-Reversal-Protection Circuit


2D model of LM7824 Voltage Regulator

LM7824 Voltage Regulator 2D Model is given below:

 LM7824 Datasheet

Component Datasheet

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