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Alternate ?? Pinout for early LM324

Discussion in 'Electronic Basics' started by bw, May 27, 2009.

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  1. bw

    bw Guest

    Found several of these, only marking is LM324
    14 pin DIP, black epoxy
    Pinout is not as shown in Nat. Semi. datasheet. V+ at pin 4, GND at pin 11.
    Also, seems to not be "conventional" GND at pin 7 and V+ at pin 14.
    Seem to recall reading of early DIP packages with different pinouts, but
    unable to locate that reference.

    Guess around 1970 mfg. but not marked with any codes.
    Google keywords for alternate, early, original, etc do not seem to be
    helpful.
     
  2. It's not an alternative pinout, you're assuming that all ICs have ground
    at pin 7 (or pin 8 if it's sixteen pins) and +V at pin 14 (or 16). But
    that's only certain for the 7400 series, and even then there were
    exceptions. The 7475 quad latch had the power supply pins in the middle
    for instance.

    Take a look at most op-amps, and they don't have the pinout you'd expect.
    The 555 timer doesn't match your expectations either, pin 1 is ground,
    pin 8 is +v.

    Right out of the 1978 National databook. Ground is pin 11, pin 4 is
    +v


    +in 3 5 10 12
    -in 2 6 9 13
    out 1 7 8 14

    A few years later. I can remember when I first read about it, which
    had to be after 1971, but I can't remember exactly when.

    Michael
     
  3. Phil Allison

    Phil Allison Guest

    ** That is the same pinout that has always been used.


    ** First released in 1974.

    ** No suprise there - since it simply does not exist.


    .... Phil
     
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