4047 Datasheet

The CD4047B is capable of operating in either the monostable or astable mode. It requires an external capacitor (between pins 1 and 3) and an external resistor (between pins 2 and 3) to determine the output pulse width in the monostable mode, and the output frequency in the astable mode.

4047 IC Applications

  • Frequency discriminators
  • Timing circuits
  • Time-delay applications
  • Envelope detection
  • Frequency multiplication
  • Frequency division


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  • Dear

    What max frequency can 4047 attain on pin 10 & 11, and for the formula f=1/(8.8*rc) should r be considered in ohms and capacitance in microfarad or farad. For eg. if r=1k and c=0.1 mfd. Plz……

  • Vasile

    Schema este interesanta.
    Te rog sa-mi spui daca exista calculator pentru acest 4047 cum exista pentru 555 ? Calculand dupa formula nu reusesc sa-l fac sa-mi scoata frecventele dorite.Cred ca are niste limite care nu-mi permit sa jonglez cu R si C in asa fel incat sa obtin 32 KHz si respectiv 42 KHz pe 10 si pe 11.Stiu ca R nu trebuie sa fie mai mica de 10k.
    Daca imi poti trimite un link cu Calculatorul ti-as fi indatorat.
    Multumesc anticipat.

  • Rjtech

    A huge and a broader schematic for say, 20KW to 30KW enough to power a house with 4 a/cs and a swimming pool schematic diagram will surely make a big impact here in this site and a considerable fee to order of such is a viable outlook not only for this site but to the readers and friends of electroschematics. A true, working and cost efficient diagram or 20KW to 30KW for solar power of 12, 24 or 48v will be a bread and butter. It will be great gift for everybody.

    • Popescu Marian

      You should have written your request in the Q&A section.
      The problem would be that the cost of this DIY project will be pretty high when there are so many cheap DC/DC converters.

  • charlappiah

    Just saw the site . I will try a few of the projects and will let you the results. Thanks

  • Adelusi Tosin

    Is there any way to steady squarewave to sinewave with ic 4047:

  • ben kofi

    i want a circuit that uses a relay to turn on my inverter set up when the grid goes off

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