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Open-Collector Output

The operation is simple...

  • The transistor is off in the LOW state.
  • The transistor is on in the HIGH state and the Open-Collector outout is connected to ground.

The open collector output can be operated at a voltage different from the supply voltage, eg, when controlling relays.

Illustration Open-Collector output.

The open-collector output is also often used where a large number of logic outputs need to be connected.

Components with Open-Collector Output

  • Timer 555
  • Comparator LM311

Open-Drain Output

For C-MOS integrated circuits, the comparable output is referred to as Open-Drain output.

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