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Home » Electronic Components » 12V 5 Amp Fixed Voltage Regulator IC 78H12A Datasheet

12V 5 Amp Fixed Voltage Regulator IC 78H12A Datasheet

Last Updated on January 1, 2020 by Swagatam 66 Comments

The post explains the technical specifications, datasheet, and application notes of the IC 78H12A which is a voltage regulator IC capable of providing a fixed regulated 12V output at maximum 5 amp current.

5 Amp Regulator Specifications

We are familiar with the popular 78XX ICs such as the 7812 IC which can produce 12V fixed voltage at its output with input supplies anywhere from 15V to 24V.

However the above device is capable of handling at the most 1 Amp of current which may be not sufficient for many standard applications.

For circuit applications which require currents as high as 5 amps, a higher rated alternative may be selected in the form of the IC 78H12A which is quite similar to its younger brother 7812 but is capable of handling up to 5 amps of current.

The main technical specifications or datasheet of this IC 78H12A may be studied with the following explanation:

The 78H12A is a three terminal  linear, positive fixed voltage regulator IC rated for continuously delivering around 5 amps of current with typical fixed 12 volts at its output.

The IC is internally fully protected a against short circuits or over loads at its output which makes it highly rugged and versatile.

In an event of a short circuit or over load across its output terminals, the device instantly shuts down the supply of power across its output leads, thus inhibiting any possibility of electrical hazards. The situation also protects the IC from getting damaged.

The above feature ensures safe operations of the connected electronics and also avoids the inclusion of external safety circuits reducing the cost and the component count of the over all configuration.

The device is available in a hermetically sealed TO-3 metal package, and facilitates easy fitting of an heatsink for better efficiency and working of the device.

Main Technical Features of the IC

The main features of the IC may be summarized as follows:

  1. Output Voltage: 12V, fixed, regulated
  2. Output Current: Maximum 5 Amps
  3. Protections: In-built short circuit and over load protected.
  4. Power Dissipation: 12 x 5 = 50 to 60 Amp Approximately
  5. Package: TO-3 metal body

Pin Outs of IC 78H12A

The figure below shows the pinout details of the IC 78H12A, if the device is held with the pins toward us and with the larger plain section of the area upwards, the right pin is the input, the left pin is the output while the body becomes the ground of the IC.

Application Notes

The IC 78H12A is fundamentally suited for all electronic circuit application where a fixed 12V is imperative and with requirements upto 5 amp, example for driving 12V DC motors, for driving high watt white LeDs for flood lighting, and also for charging lead acid batteries (with some modifications).

The following diagrams illustrate a couple of main applications which may be implemented with this versatile 12V 5 amp fixed voltage regulator IC.

12V 50 AH Battery Charger Circuit

30 watt LED Driver Circuit

Using LM338

In case you are unable to get the above IC, you can create an equivalent 12V 5 amp fixed regulator using the following LM338 based configuration

12V 5Amp from IC 7812

In the above designs we learned how to get 12V fixed voltage at 5 amp current from specialized IC, however the same could be easily acquired from a simple 7812 IC, through a little modification as given below.

The diodes at the center lead of the IC 7812 allows us to alter the output to any desired value that may be higher than 12V.

For example for charging a 50 Ah battery you may require 14V 5 amp, which can quickly tweaked by adding the shown diodes.

So this design is actually is quite customizable for many different 12V 5 amp applications.

For adjusting the current output, simply alter the value of the lower 1 ohm 5 watt resistor, it's as simple as that!

The indicated TIP36 will allow upto 25 A, however if you are only interested to get 5 amps, you can easily replace it with a TIP32C transistor over a heatsink.

get 12V 5 amp from 7812 IC

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About Swagatam

I am an electronic engineer (dipIETE ), hobbyist, inventor, schematic/PCB designer, manufacturer. I am also the founder of the website: https://www.homemade-circuits.com/, where I love sharing my innovative circuit ideas and tutorials.
If you have any circuit related query, you may interact through comments, I'll be most happy to help!

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  1. Rajagilse says

    sir` please give me the name of 12 volt 10 amps fixed voltage regulator. if it exists. and the price in india

    Reply
    • Swagatam says

      Hi Raja,

      Please refer to this article, it's not a fixed regulator but will do the job:

      https://www.homemade-circuits.com/2013/04/15v-10-amp-adjustable-voltage-regulator.html

      Reply
    • Subodh Singh says

      u can use lm198 ic for this purpose

      Reply
    • King Saeed says

      hello dear my self King saeed from Pakistan.Dear i want to make a DC powersupply from 12v,1amp to 12v,5amp dc so please help me for finding ic or regulater……

      Reply
    • Swagatam says

      You can try the following power supply circuit

      https://www.homemade-circuits.com/2012/01/how-to-make-versatile-variable-voltage.html

      Reply
  2. Srinivas says

    Hi Swagatam,

    I am having 50 watt solar panel and 12 volts 15 watt DC table fan. I want to run DC fan with solar panel in day time.

    Can I use this IC 78H12A to regulate 12 volts output from solar panel and run all the day?
    why I am asking is my solar wattage is more (50watt) then the table fan (15watt). Is there any damage to table fan with higher wattage solar panel?

    Thanks,
    Srinivas

    Reply
    • Swagatam says

      Hi Srinivas,

      You can use the above IC safely for the required application. There won't be any problem as long as the solar voltage stays within 24V

      Reply
    • Srinivas says

      Thank you very much

      Reply
  3. Subodh Singh says

    hello sir,
    i wanted to make a 24 volt, 5ampere dc to 12 volt 5 ampere dc converter for heavy duty industrial vehicle as my project. so can u help me by giving circuit expalinaton and name of required components, please sir……..
    my name is subodh singh, live in kolkata.

    Reply
    • Swagatam says

      Hello Subodh, I think you can try the above IC for your application.

      The IC is rated to produce a guaranteed 5amp current (max) and the input range is upto 35V (max).

      Use a large heatsink for getting an optimum response from the device.

      Reply
    • Subodh Singh says

      sir, heat sink means, using a transistor with resistance?

      Reply
    • Swagatam says

      no it means the transistors should be fitted with large aluminum plates for sinking its heat.

      Reply
  4. Subodh Singh says

    hello sir, my self subodh singh , live in kolkata, sir i m making a 24 volt, 5 ampere dc to 12 volt ,5 ampere dc converter. so i wanted to know is ic78h12 is suitable for this project. and can u help me by explaining the required circuit and also name the required components… please

    Reply
    • Swagatam says

      yes it is suitable, you can make the last circuit shown in the above article.

      Reply
  5. Subodh Singh says

    hello sir, my self subodh singh , live in kolkata, sir i m making a 24 volt, 20 ampere dc to 24 volt ,5 ampere dc converter. so i wanted to know which ic is suitable for this project. and can u help me by explaining the required circuit and also name the required components… please

    Reply
    • Swagatam says

      hello subodh,

      you can try the first diagram given in the following link:

      https://www.homemade-circuits.com/2013/06/universal-high-watt-led-current-limiter.html

      Use LM196 or LM396 instead of the LM117 and calculate R1 as per the given formula

      Reply
    • Subodh Singh says

      sir can u give me the ckt diagram of current satblizer, is there any IC stablizewhich can be used as a curent stablizer or it can only done by using transistor. Can u give me the name of replacement of transistor IRF9540.

      Reply
    • Swagatam says

      Subodh, you can try the circuit shown in the following link:

      https://www.homemade-circuits.com/2011/12/make-hundred-watt-led-floodlight.html

      what is amp and voltage rating of IRF9540?

      Reply
  6. Subodh Singh says

    sir, IRF9540 is a Pchannel enhancement mode mosfet and has a voltage rating is 100V and current rating is 19A.

    Reply
    • Swagatam says

      Subodh, just type 100V p-channel mosfet and Google it online you will find plenty of choices.

      Reply
  7. arbind kumar says

    Hi
    I have 12 volt 150 amp battery.
    I want to convert 12 volt dc 5 amp For rgb led strip.
    My email address is arbinddimond.2009@gmail.com

    Thanks

    Reply
    • Swagatam says

      You can use the circuit suggested above, or use a LM338 IC circuit for the same by adjusting its output at 12V

      Reply
    • King Saeed says

      Mr.arbind kumar can u send me circuit diagram of 12v ,5amp dc powersupply.my email address is kingsaeed126@yahoo.com

      Reply
  8. victory says

    Sir can i use the 6a10diode as rectifier and also can i use this circuit to charge my 12v 36amp battery.the four 1n4007 will increase the voltage to 14v right?

    Reply
    • Swagatam says

      Victory, yes, you are right, you can go ahead with it….

      Reply
  9. Tushar says

    Hey Can I get his IC online in India? I checked local store but they don't have. Even when I search this on Google I am not able to find any Datasheet. Why so?

    Thanks in advance

    Reply
    • Swagatam says

      You can try LM338 instead, and wire it to produce the required 12V

      Reply
  10. Haider ali khan says

    Yes its true sir!

    Reply
  11. Swagatam says

    yes you can, but if the LEDs are rated at 3.3V then the ideal way should be to make series of 4 LEDs in one string, and then connect 6 such strings in parallel and use with the above SMPS driver.

    Reply
  12. Licenio Liatona says

    can i use this to supply strip LED lights…thanks

    Reply
    • Swagatam says

      yes surely you can….

      Reply
  13. sameer pitale says

    hello, i want output of 20v and 4 amp from input of 22v and 6amp
    which ic can do it please answer.

    Reply
    • Swagatam says

      Hello, you can use an LM338 circuit and adjust its voltage regulation pot to set the required voltage

      Reply
  14. Aman Pathak says

    How can i get 12V, 3-4A output from 5V, 8A power bank batteries? Do giude me for that ASAP

    Reply
    • Swagatam says

      you can get it through a buck converter circuit….search for buck converter in this website for more info…

      Reply
  15. Bubu says

    Hello sir,
    My 3 wheel head lamp have 1w x 6 leds. Using PT 4115. It dmaged by maginto current. So I want 12v about 5 amp dc circuit. How I modififate above circuit for my requirement.

    Reply
    • Swagatam says

      Bubu, in that case you try the second circuit from the following article

      https://www.homemade-circuits.com/2013/07/making-led-halogen-lamp-for-motorbike.html

      Reply
  16. Bubu says

    Tks lot sir..

    Reply
  17. Bubu says

    Sir,
    LM 338k or LM 338t…. Which one is the best to that circuit sir ?

    Reply
    • Swagatam says

      Both are identical, both will work equally well, you can use any one of them

      Reply
  18. Bubu says

    Tks lot again sir…

    Reply
  19. Amardeep says

    Hello sir, I want to convert 30V 5A to 18v 5A which circuit will fulfill my requirements.

    Reply
    • Swagatam says

      Amardeep, you can try the following circuit

      https://www.homemade-circuits.com/5v-pwm-solar-battery-charger-circuit/

      adjust the R8/R8 to get 18V

      Reply
      • Amardeep says

        Thanks sir, I’ll try.

        Reply
    • Amardeep says

      R8/R8 what does it means.

      Reply
      • Swagatam says

        sorry, I meant R8/R9

        Reply
  20. christ says

    hello, r1 and r2 how many watts would it be, with the IC LM 338, I want to power a 40W thermal printer.
    Thank you

    Reply
    • Swagatam says

      Hi, both are 1/4 watt

      Reply
  21. Ruturaj Desai says

    Hello sir, Your website is amazing and full of information. Sir I want to design an circuit to charge 20v,5amp
    and 48v,30amp. Can you help please?. Thank you

    Reply
    • Swagatam says

      Thank you Ruturaj, I appreciate your question, however, sorry, I do not have an SMPS circuit with 20V and 48V specifications at this moment.

      Reply
      • Ruturaj Desai says

        Thank you for your reply sir, can u at least help me with charging circuit for 24V,14amp battery?

        Reply
        • Swagatam says

          Ruturaj, you can try the following schematic, and reduce the secondary side winding turns by 50% to get 24V

          https://www.homemade-circuits.com/smps-2-x-50v-350w-circuit-for-audio/

          Reply
  22. Najieh Sadra says

    Hello dear swagatam
    thank you so much for your very useful and informative site.
    I have a question regarding series of IC 78.. for example 7812.
    Would please tell if we need to provide an aluminum heater dissipating for IC7812 after the output current of it in an power supply circuit exceeds than 200mA? when we need to mount it on this IC ?
    sincerely yours
    Najieh

    Reply
    • Swagatam says

      Hello Najieh, you can check that practically by touching. If you find it heating up too much, then a heatsink would help!

      Reply
  23. Pedro says

    Hello Swagatam,

    I’m looking for a replacement for Solitron BN4001 12VDC, I’would like to know if there is any similar component, specially for the voltage input form 16 to 37V.

    Thanks you in advance for sharing your knowledge and experience with us.

    Reply
    • Swagatam says

      Hello Pedro, can you please specify what is this part BN4001, is it a zener diode, rectifier diode or a transistor?

      Reply
  24. John says

    12V 50 AH Battery Charger Circuit
    Is this charger capable of”constant current charging, constant voltage charging, floating charge.” or will I have to have more components to achieve this

    Reply
    • Swagatam says

      Yes it will give slightly less than 5 amp constant current, and also a constant voltage depending on the number of diodes at its GND pin

      Reply
  25. Suresh says

    Thanks for the information,

    Reply
  26. George says

    1) How to select smoothing or filter capacitor in a practical linear power supply design
    2) In a 12v power supply, the load voltage is 12v/1amp and after rectification the voltage become 16.9v more than the load voltage does it mean am to select a 9v transformer in other to have the right out put voltage. Kindly explain

    Reply
    • Swagatam says

      1) You can refer to the following article for calculating the smoothing capacitor:

      Calculating Filter Capacitor for Smoothing Ripple

      2) Yes that’s correct, but you can easily step down the 16V to 12V by using a 7812 regulator IC.

      Reply
  27. Anjum Rashid says

    Hello Dear. My problem is my 12 volt 1.5Amp DC brushless fan attached with a solar panel with 12 volt battery. The fan start and stop when the voltage goes over 12 volt. For example, if the voltage are around 13 then this fan starts on & off. when the voltage are stable at 12 volt then fan runs smoothly.
    1 – What I presumes that I need a voltage regulator that regulates the volts to 12 all the time, even if the in put voltage may be 13 volts. Is it right?? if yes then which circuit / regulator should I use???
    2 – Should I change the hall effect circuit of the brushless DC motor fan with a simple circuit?

    Reply
    • Swagatam says

      Hello, if your motor cannot handle above 12V then you an add a 12V voltage regulator, such as IC 7812.

      Hall effect sensor is a part of the BLDC circuit which cannot be modified easily.

      Reply
  28. Anjum Rashid says

    Dear Friend. Please share your WhatsApp number so that I send you some pics and videos for better understanding. Thanks

    Reply
  29. alain says

    hello sir for my hunting territory I have 2 300 watt panels which charge my batteries with a zantrex converter when the weather is nice everything works very well but if there are clouds the voltage drops drastically, I thought I would take a 12 volt brushless motor with its driver and power an alternator to charge my batteries what do you think of this idea thank you.

    Reply
    • Swagatam says

      Hello Alain, yes definitely you can do that. You can use an alternator to charge your batteries whenever the weather is not good, and your solar panels are not producing enough power.

      Reply

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