Series:	--
Packaging:	Bulk
Part Status:	Obsolete
Sensing Distance:	0.125" (3.18mm)
Sensing Method:	Transmissive
Output Configuration:	Phototransistor
Current - DC Forward (If) (Max):	50mA
Current - Collector (Ic) (Max):	30mA
Voltage - Collector Emitter Breakdown (Max):	30V
Response Time:	--
Operating Temperature:	-40°C ~ 85°C
Mounting Type:	Chassis Mount
Package / Case:	Module, Pre-Wired
Type:	Unamplified

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Optical Sensors - Photointerrupters - Slot Type - Transistor Output

OPB872N55 application field and working principle

Optical Sensors are sensors that detect radiation in the visible, infrared, or ultraviolet spectrum. Often, this radiation is intercepted and converted to an electrical signal allowing detection of the presence, distance, or intensity of the radiation, depending on the physical parameter being measured. Among them, photointerrupters, as a class of optical sensors, detect the presence of objects or movement of objects using light. They are effectively transmissive optical switches because they sense when an opaque object passes between an emitter and receiver.OPB872N55 is a type of photointerrupter, belonging to the slot type and transistor output. It is specifically designed for precise positioning and detecting services in control and processing systems, ideally suited for applications requiring high precision, position sensing.At the very heart of the OPB872N55, there is an emitter and a receiver, which are two bare GaAs infrared LED chips encapsulated in one plastic housing. The emitter, when powered, emits a beam of infrared light through an opening in the housing and the receiver is positioned on the opposite end which will detect the presence of the beam after it passes through the opening. In the middle of the emitter and the receiver, there is a slotted opening, or a “chute”, different thicknesses of which would allow the beam of light to pass through. Since the receiver is shielded from direct light emitted from the emitter, the receiver will only detect the beam from the emitter when the beam is not interrupted by an opaque object in the path. The receiver output will be inversely related to the amount of interruption by the opaque object.Besides the application of precise positioning and detecting services in control and processing systems, the OPB872N55 can be used in establishing security systems that detect presence of an intruder, or as low-cost device to control simple automated machines with rapid response and stable performance. The OPB872N55 also finds its application in devices for measuring the width of slim objects, counting the number of pieces quickly and accurately, such as bottles on an automated assembly line that require precision. Furthermore, it can be utilized for counting small items such as magnets or coins.In summary, OPB872N55 is a type of Photointerrupter with slot type and transistor output, enjoying the advantages of high accuracy, precision, and stability. It is widely applicable in the area of establishing security systems, controlling automated machines, measuring the width of slim objects and for counting small items. Besides its applications, the OPB872N55 has the capacity of sensing when an opaque object passes between an emitter and receiver, and the output is a transistor regulated by the amount of interruption. As far as its application is concerned, the potentials are limitless.

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