The IC 7404 is a hex inverter chip with a huge operating voltage range and wide operating conditions. It features six different inverter gates, and there are an input and an output for each gate. When an input signal is transmitted to one of the gates, it becomes inverted when it leaves through the corresponding output gate.

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For instance, if the input signal is low as it goes into the input gate, then it will come out as a high output signal from the output gate. The opposite is true, as well. If the input signal is high, the output signal is low. That is the purpose of an inverter chip, but especially the IC 7404.

There are 14 pins found on the IC 7404 chip. You’ll see most of the pins make up various input gates and output gates. Only two pins are not input or output gates: the positive supply pin and the ground pin.

Take a look at the gates below:

  • Pin 1 – A Input Gate 1
  • Pin 2 – Y Output Gate 1
  • Pin 3 – A Input Gate 2
  • Pin 4 – Y Output Gate 2
  • Pin 5 – A Input Gate 3
  • Pin 6 – Y Output Gate 3
  • Pin 7 – Ground
  • Pin 8, – Y Output Gate 4
  • Pin 9 – A Input Gate 4
  • Pin 10 – Y Output Gate 5
  • Pin 11 – A Input Gate 5
  • Pin 12 – Y Output Gate 6
  • Pin 13 – A Input Gate 6
  • Pin 14 – Positive Supply

All digital electronics have an inverter chip in them. The IC 7404 is constructed with either a PMOS transistor and a resistor or just an NMOS transistor. The output gates interface to TTL, CMOS, and NMOS.

Only an experienced electrician should replace an IC 7404 chip. It costs between $1 to $2 at a typical electrical parts store.

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