SFH 303 FA-3/4 RN23C

Series:	--
Packaging:	Bulk
Part Status:	Obsolete
Voltage - Collector Emitter Breakdown (Max):	35V
Current - Collector (Ic) (Max):	50mA
Current - Dark (Id) (Max):	50nA
Wavelength:	990nm
Viewing Angle:	40°
Power - Max:	200mW
Mounting Type:	Through Hole
Orientation:	Top View
Operating Temperature:	--
Package / Case:	T 1 3/4

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Optical Sensors: Phototransistors

Phototransistors are a type of optical sensors commonly used in industrial automation and instrumentation. The SFH 303 FA-3/4 RN23C is a phototransistor developed by Siemens, and is especially suited to applications involving sensing the presence of objects. It is a two-terminal device with a number of interesting characteristics that make it easy to use and highly responsive in a variety of industrial settings.

Size and Shape

The SFH 303 FA-3/4 RN23C phototransistor is a small, rectangular device at just 5 mm wide, 3.4 mm tall, and 1 mm thick. This allows it to fit into the tightest of spaces and find its way into compact machines and circuits. It also has an unusually low power draw of just twenty-five microwatts.

Working Principle

The SFH 303 FA-3/4 RN23C is built for sensing the presence of objects using photoconductivity; in this mode, the device functions like an electrical switch. When a beam of light — often in the infrared or visible spectrum — hits the collector layer of the phototransistor, it generates a current which can be used to trigger a response. The device is also able to detect changes in light intensity.

Applications

The phototransistor’s small size and low power requirements make it ideal for industrial and consumer applications. Its response time and detection capabilities make it an excellent choice for machine vision applications, such as counting objects in a line or tracking a 2D object as it moves across a surface. It can also be used in home automation systems and other consumer products to detect changes in light intensity, presence of objects, and more.

Advantages

The SFH 303 FA-3/4 RN23C stands out among other phototransistors with its small size, low power requirements, and fast response time. Additionally, the device has a wide light detection range from 3.3 to 85 µm. The device also has good heat-resistance and is capable of operating in temperatures ranging from -40°C to +85°C. Finally, its sensitivity can be adjusted through the voltage applied to it.

Conclusion

The SFH 303 FA-3/4 RN23C phototransistor is an excellent choice for sensing the presence of objects using photoconductivity. Its small size, low power requirements, fast response time, and wide detection range make it an ideal choice for industrial and consumer applications. With its adjustable sensitivity and excellent heat resistance, the phototransistor also offers a number of advantages over other devices of its type.

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