About 7818 Voltage regulator

7818 Voltage regulator is a type of self-contained fixed linear voltage regulator integrated circuit. The IC belongs to 78xx voltage regulator family which is commonly used as the regulated power supply in electronic circuits. The 7818 voltage regulator IC is ease-of-use and available in very low cost. The last two digits of 7818 indicates the output voltage that is voltage.

78xx voltage regulator ic

The 7818 regulator line is a positive voltage regulator that is the 7818 voltage regulator ic generate the voltage which is positive with respect to the common ground. In case if both the positive and negative voltage supply is needed in the same circuit. The voltage regulator 7818 is combined with its corresponding 79XX family IC. The voltage regulator 7818 is available most commonly in TO-220 package, more over the IC is also available in TO-3, TO-92 and surface mount Packages.

The 7818 Voltage regulators do operate at their optimal capability if the input voltage is at least 2.5 volt greater than the output voltage and the current is 1 or 1.5 Amperes more. Though the voltage and current different is different for other IC Packages.

How to use IC 7818

78xx voltage regulator circuit

The 7818 ic have 3 pins, Pin 1 is a positive input, Pin 3 is a positive output and pin 2 is negative common ground between both input as well as output voltage. When using the voltage regulator setup, you need to take care of the current through the voltage regulator ic do not exceed beyond the capacity which is mentioned in the datasheet or else it may blow off. You also have to be careful with the connection you are making with the voltage supply. Reverse polarity does get the ic heat up really quickly, you can also use a pn junction diode in order to prevent such a condition.

You can use the capacitors in order to minimize the voltage fluctuations in the circuit and maintains the constant voltage across the input as well as output of the circuit.


  • 7818 voltage regulator ic does not require any component to balance or saturate their output voltage.
  • The 7818 ic has a built-in protection from the high current. There is a heat-sink with the common ground connected with which is helpful in order to prevent our regulator ic from overheating and short-circuits making it uncompromising in the most application.



This article has 2 comments

  1. Robbie Ohana Reply

    can i use 7818 voltage regulator in a rectifier to charge my laptop ?

    • Farhan Ahmad Reply

      I would not suggest you to do so since the output voltage of a full wave rectifier is unregulated dc voltage. If you want to charge your laptop then i would rather suggest you to go for SMPS as they do have a constant as well as regulated DC voltage instead.

      But if you are using the Switched Mode Power Supply then i do not think that there is a need of 7818 IC.

Leave a Comment

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