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Infrared Glossary of Terms

Definitions

Term Definition
Aperture Width Width of the built-in openings in front of the emitter and photosensor that define the size of the beam.
BVCEO> Collector-Emitter Breakdown Voltage with the base open.
Emission Angle @ 1/2 Power Angle of the cone where the light intensity is half that on the optical axis.
ICC Supply Current Current drawn from the supply at a given voltage.
ICEO Collector-Emitter current for radiant sensitive devices when the base is open and without radiant incidence.
IF Current flowing through a diode from anode to cathode.
IF+ Diode forward current (IF) required to cause the output to turn on.
IF- Diode forward current (IF) required to cause the output to turn off.
IR Current flowing through a diode from cathode to anode.
IR(D) Reverse dark current for a given supply voltage.
Lead Spacing Distance between the leads from the emitter side of the package to the photosensor side.
Light Current Current which flows through a device due to radiant incidence.
Negative Threshold Amount of incident light at which the device turns off.
On-State Collector Current Collector current at a specified radiant incidence and a specified collector voltage.
Operating Supply Voltage Voltage under which the device operates.
Output Configuration Output circuit and function.
Output Power The radiant intensity of emitted light measured in mW/sr.
Positive Threshold Amount of incident light required to turn the device on.
Reception Angle @ 1/2 Power Angle of the cone where the sensitivity is half that on the optical axis.
VF Voltage between anode and cathode at a specified forward current.
VR Voltage between cathode and anode at a specified reverse current.
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Space Last updated May 17, 2007