(Topic ID: 57376)

Difference in IC's ?

By BillinIndiana

6 years ago

Topic Stats

  • 9 posts
  • 4 Pinsiders participating
  • Latest reply 6 years ago by HHaase
  • Topic is favorited by 1 Pinsider


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    #1 6 years ago

    What's the difference between a HD74LS02P and a SN74F02N ?I've tried Google and it gets a little to technical for me. Are the two interchangeable ?

    #3 6 years ago

    Here is some information that may help you.


    74 - the "standard TTL" logic family had no letters between the "74" and the specific part number.
    74L - Low power (compared to the original TTL logic family), very slow
    H - High speed (still produced but generally superseded by the S-series, used in 1970s era computers)
    S - Schottky (obsolete)
    LS - Low Power Schottky
    AS - Advanced Schottky
    ALS - Advanced Low Power Schottky
    F - Fast (faster than normal Schottky, similar to AS)

    The "P" on the HD74LS02p is for the package type

    The "N" on the SN74F02N is for the package type

    The two (or sometimes three letter prefix) indicates the manufacturer of the device (e.g. SN for Texas Instruments)

    Hope this helps you out

    #4 6 years ago


    In a lot of cases they are interchangeable, but not always. On a system 6 driver board use 74f02 and 74f08. On the System 6 MPU use 74LS02 (74f02 may work here too, but i know ls does for sure).

    #5 6 years ago

    How do you tell from the schematics which to use? In the schematic it just has 7402 and I can't find where it says any specifics on if it should be a Low Power Schottky or a Fast or any of that? Am I not looking in the right place?

    Edit: I guess I should add without just looking at the one that is on the board.

    #6 6 years ago

    Most CPU board stuff an LS or HCT is a good choice, where for driver boards I use F series.
    But it does help to know which board and location we're talking about.


    #7 6 years ago

    Most CPU board stuff an LS or HCT is a good choice, where for driver boards I use F series.
    But it does help to know which board and location we're talking about.

    Sys 11A CPU.. I had a Special Solenoid locked on and have replaced the trans associated with them. When testing the IC's with a logic probe I don't get a reading at Pin 10 of U50, it's dead.. I back up and check the 7406 inverter U56 and have Low signal going into Pin 5 but it doesn't invert to a High it stays Low at Pin 6 of U56..
    Here is a part of the schematic I'm talking about


    #8 6 years ago

    Oh and the reason I asked is because I have replacements for U50 which is a 7402.. I have some that are the HD74LS02P where as the one on the board is a SN74F02N.. And it's on a socket so I'm not sure if it is the original or what?

    #9 6 years ago

    I've never seen an F series as original, so it's likely a replacement. Both should work fine in this application.


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