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Glossary

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Term Description
Open Collector A logic device or sensor that provides an output transistor with an unconnected collector. When turned on, this transistor sinks current to ground, but it cannot source any current. An open-collector output usually serves as a switch to ground.
Optical Coupler See: Opto Coupler
Optical Isolation The use of a light path to transfer a signal from a transmitter, usually a light emitting diode (LED), to a receiver, usually a phototransistor. This technique provides electrical isolation as a signal passes from one circuit to another.
Optical Isolator See: Opto Coupler
Opto Coupler A device that uses light emissions to cause an isolated output stage to turn on. This device allows detection and sensing of potentially dangerous or high voltage signals, while providing isolation and protection to the circuitry sensing them.
Opto Isolator See: Opto Coupler
OR Gate A circuit that performs an OR operation based on the state of its inputs.
Overload Protection The capability to protect a circuit when current exceeds a predetermined value. Devices such as fuses or circuit breakers automatically disconnect a load when they sense an overcurrent.
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