PT91-21B/TR10 Sensors, Transducers

Series:	--
Packaging:	Tape & Reel (TR)
Part Status:	Active
Voltage - Collector Emitter Breakdown (Max):	30V
Current - Collector (Ic) (Max):	20mA
Current - Dark (Id) (Max):	100nA
Wavelength:	940nm
Viewing Angle:	--
Mounting Type:	Surface Mount
Orientation:	Top View
Operating Temperature:	-25°C ~ 85°C (TA)
Package / Case:	2-SMD, Z-Bend

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Introduction of PT91-21B/TR10PT91-21B/TR10 is an optoelectronic sensor commonly used in industrial and automotive control and automation systems. It is an optical isolation module which combines a high-reliability phototransistor and a Super High-Brightness Infrared LED. It is widely used in applications such as optical reflection switches, optical proximity switches, optical object detectors, IR remote controls, and automotive crash protection systems.Description of PT91-21B/TR10PT91-21B/TR10 features a reliable phototransistor, a Super High-Brightness Infrared LED, a 9~30V operating voltage range, a low operating current of only 30mA and a wide temperature range of -40°C to +125°C. The phototransistor has a high responsivity of 17mA/W, while the Super High-Brightness Infrared LED provides a maximum emission power of 600mW/sr. It is RoHS compliant and EMI protected in accordance with CISPR 22/EN 60950-1 standards. Application Field of PT91-21B/TR10PT91-21B/TR10 optoelectric sensing module is suitable for wide range of applications, including optical reflection switches, optical proximity switches, optical object detectors, IR remote controls, and automotive crash protection systems. The optical reflection switch applications include medical devices, industrial automation systems, automotive control systems, and electronic appliances. They can detect the presence of an object moving towards it and measure the distance of the object. In optical proximity switch applications, PT91-21B/TR10 can detect the presence of an object in range. This feature is useful in situations requiring a precise location of the object. For example, in automotive applications, it can be used to detect the presence of a car in a traffic lane and trigger the traffic light accordingly. In industrial automation systems, it can be used to detect the presence of parts in production line.PT91-21B/TR10 can also be used in optical object detectors. The high responsivity of the phototransistor allows it to quickly detect the presence or absence of an object, either in close range or in a wide area. This makes it ideal for automation systems such as automated automated packaging and sorting systems.Finally, PT91-21B/TR10 can be used in IR remote control applications. The Super High-Brightness Infrared LED allows it to be used in large range remote control systems, including television, air conditioners, and lighting control systems.Working Principle of PT91-21B/TR10The working principle of PT91-21B/TR10 optoelectronic sensor is based on the transduction of the infrared radiation emitted by the LED into an electrical signal, which is then further processed by the phototransistor.When the sensor is not powered, the LED remains off and no electrical signal is generated, but when the sensor is powered, the LED will turn on, providing the infrared radiation necessary to trigger the phototransistor. This infrared radiation is absorbed by the phototransistor, generating an electrical signal which is detected by the receiving circuitry.The intensity of the infrared radiation is directly proportional to the amount of current that runs through the LED, and the magnitude of the detected electrical signal is determined by the responsivity of the phototransistor. The higher the responsivity, the better the sensitivity of the sensor.In optical proximity switch applications, the phototransistor acts as a virtual switch in the circuit, closing and opening as the detected distance of the object varies. The detected distance of the object is proportional to the intensity of the infrared radiation received by the phototransistor. In optical reflection switch applications, the phototransistor is used to detect the presence of an object moving towards it. When the object is in close range, the optical reflection is detected by the phototransistor and an electrical signal is generated.Finally, in IR remote control applications, the Super High-Brightness Infrared LED sends out a modulated signal, which is then detected by the phototransistor. The modulated signal is decoded by the receiving circuitry, and the corresponding action is performed.ConclusionIn conclusion, PT91-21B/TR10 is an optoelectronic sensor which can be used in a wide variety of applications, including optical reflection switches, optical proximity switches, optical object detectors, IR remote controls, and automotive crash protection systems. It is based on the transduction of the infrared radiation emitted by the LED into an electrical signal, which is then further processed by the phototransistor. Its features such as low operating current and broad temperature range make it suitable for industrial and automotive control and automation programs.

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