Series:	--
Packaging:	Tape & Reel (TR)
Part Status:	Obsolete
Sensing Distance:	0.197" (5mm)
Sensing Method:	Reflective
Voltage - Collector Emitter Breakdown (Max):	30V
Current - Collector (Ic) (Max):	10mA
Current - DC Forward (If) (Max):	50mA
Output Type:	Phototransistor
Response Time:	50µs, 50µs
Mounting Type:	Surface Mount
Package / Case:	6-SMD
Operating Temperature:	-40°C ~ 100°C

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SFH 9201 Application Field and Working Principle

Optical sensors are widely used in various industrial and automotive applications. The SFH 9201 is an infrared emitter and photodetector package in a one-piece miniature housing. It provides a highly reliable analog output signal for pickup and proximity sensing when combined with an appropriate receiver or photodiode. This article provides a detailed explanation of the application field and working principle of the SFH 9201.

Application Field

The SFH 9201 is primarily designed for detecting objects, materials or liquids in machines, process control equipment, and other automotive applications. The SFH 9201 is optimized for use with thick film integrated circuits (ICs) and is suitable for both monitoring and monitoring/actuating functions.The SFH 9201 is most commonly used in automotive applications for gearshift levers, wiper blades, trunk and door interlocks, gas tank lids, and parking brake systems. In industrial settings, the SFH 9201 can be used to measure levels of liquids and materials, detect the presence of objects in moving machines, and sense the position of disk/roller stacks, conveyors, and machine components. The SFH 9201 can also be used as a surface stability detector.

Working Principle

The SFH 9201 works on the principle of optical reflection. It consists of a vertical cavity photodetector (VCSEL) and an integrated phototransistor mounted on a one-piece miniature housing. The VCSEL operates as an infrared emitter and the phototransistor as a detector. When the SFH 9201 is installed in the application, infrared radiation emitted from the VCSEL is reflected onto the phototransistor. The reflected infrared radiation causes a change in the current flow in the phototransistor, which is converted to an analog output signal. The analog output signal can then be used to detect the presence or absence of an object and its distance from the sensor.

Conclusion

The SFH 9201 is an effective optical sensor for object detection, material or liquid sensing, and surface stability detection in automotive and industrial applications. It works on the principle of optical reflection, and is optimized for use with thick film ICs. The SFH 9201 uses a vertical cavity photodetector (VCSEL) as a light transmitter and an integrated phototransistor as the detector. When the infrared radiation emitted from the VCSEL is reflected onto the phototransistor, it causes a change in the transistor’s current flow, which is converted into an analog output signal that can be used to detect the presence or absence of an object.

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