OPB981N11Z

Series:	Photologic®
Part Status:	Obsolete
Sensing Distance:	0.125" (3.18mm)
Sensing Method:	Transmissive
Output Configuration:	NPN - Open Collector, Buffer
Mounting Type:	Chassis Mount
Current - Supply:	15mA
Voltage - Supply:	4.75 V ~ 5.25 V
Response Time:	70ns
Operating Temperature:	-40°C ~ 70°C (TA)
Package / Case:	Module, Pre-Wired

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Optical Sensors – Photointerrupters – Slot Type – Logic Output

Optical Sensors are devices that detect the presence of an object, which range from the most basic, Photointerrupters, to more complex sensors such as 3D Time of Flight and RGB cameras. Photointerrupters are used in a wide range of applications that require positional sensing, such as gate detection, motor rotation, and object presence. OPB981N11Z is a high-performance and cost-effective Photointerrupter based on the Slot Type and Logic Output principle.

Principle of Operation

The OPB981N11Z Photointerrupter uses a slot-shaped gap to detect the presence of an object. The device consists of an emitting element and a phototransistor that are placed next to each other and aligned so that light emitted from the emitting element is able to reach the phototransistor when an object is not present. When an object is present in the middle of the gap, it blocks the light from reaching the phototransistor, which acts as a switch and sends an output signal to the circuit.

Working Parameters

The OPB981N11Z Photointerrupter has a variety of parameters to take into consideration when using the device. It is a wide gap interrupter, with a detection range of up to 6mm between the transmitting and receiving elements. It operates at a maximum of 6mA and has a voltage rating of 5V DC, and a current consumption of less than 20μA. The device also provides logic output signals to indicate presence or absence of an object in the gap.

Applications

The OPB981N11Z Photointerrupter is predominantly used in gate detection applications, usually with metal detectors such as those used in supermarkets to detect shoplifters. It is also widely used in motor control, to detect when a motor is operating correctly, and in object presence detection, such as in automated assembly lines. In addition, the device can be used in a wide range of optical detection applications, due to its fast response time and wide detection range.

Benefits and Potential Limitations

The main benefit of the OPB981N11Z Photointerrupter is its low cost and ease of use. It is a low-power, wide-gap interrupter whose logic outputs are easy to integrate into existing circuits, making it a great choice for simple sensing applications. However, the device has limited range and slow response time when compared to higher-end sensors such as 3D Time of Flight or RGB cameras, making it a less than ideal choice for more complex applications.

Conclusion

The OPB981N11Z Photointerrupter is a cost-effective and simple solution for gate detection, motor control and object presence applications due to its low power requirements, wide detection range and easy to use logic outputs. However, for more complex sensing applications, such as 3D Time of Flight and RGB image sensing, more advanced and costly sensors will be needed. Thus, this device will fit applications that only require simple optical sensing.

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