7407 IC replacement

Discussion in 'The Projects Forum' started by jj_alukkas, Jun 5, 2010.

  1. jj_alukkas

    Thread Starter Well-Known Member

    Jan 8, 2009
    751
    5
    Hi,

    Im building a pic programmer based on a conquest circuit as there is not enough voltage to run a jdm on my serial port. But the hex buffers used for this programmer are 7407 chips and not available in my locality. When I looked up the datsheet it says 'Hex buffers\drivers with open collector high voltage outputs' Can anyone help me with a replacement chip which can easily be found but would work with the circuit? Thanks a lot in advance,,
     
  2. jj_alukkas

    Thread Starter Well-Known Member

    Jan 8, 2009
    751
    5
    Will a ULN2803 or 74LS06 work??
     
  3. bertus

    Administrator

    Apr 5, 2008
    15,645
    2,344
    Hello,

    The ULN2803 might work.
    The SN7406 is the inverting version of the SN7407.

    I have attached all datasheets.

    Bertus
     
  4. t06afre

    AAC Fanatic!

    May 11, 2009
    5,939
    1,222
    As I can see
    7417
    a 7404 followed by a 7405
    74ls641
     
  5. eblc1388

    Senior Member

    Nov 28, 2008
    1,542
    102
    Any inverter follows by a NPN transistor(with base resistor) or a MOSFET(2N700x) will give you the equivalent of an open-collector output.
     
  6. jj_alukkas

    Thread Starter Well-Known Member

    Jan 8, 2009
    751
    5
    Thanks a lot!!

    What about a 4069?? Will I be able to use it with an NPN?
     
  7. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    You would be better off to use a 4106, which is a hex Schmitt-trigger inverter.

    You could also use a couple of 4093 quad Schmitt-trigger NAND gates. If the two inputs to a NAND gate are wired together, you wind up with a Schmitt-trigger inverter.

    You could use a 3.9k resistor on the output of each gate to drive an NPN transistor, like a 2N3904, or a MOSFET like a 2N7002.
     
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