SFH 309-4

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Optical sensors and phototransistors are commonly used in industrial applications. In this article, we will be discussing the application field and working principle of SFH 309-4.

SFH 309-4 is a NPN phototransistor, which is small and reliable, manufactured by OSRAM. It is especially suitable for height measurements due to its fast switching times and features a built-in integrated shield for protection against magnetic fields. Additionally, they are ideal for used in housing controlled luminescence devices, such as relays, infrared receivers, and with logic control applications.

This type of phototransistor relies on the photovoltaic effect. This effect occurs when photons of light that strike its active surface, generate a weak electric current. Additionally, this type of phototransistor is composed of an emitter, a base, and a collector. When light hits the semiconductor material, electrons are generated, which can then flow through the emitter to the base. The electrons travel to the base due to the base-emitter junction which is formed by the negative terminals of the base and the emitter. The electrons then travel to the collector, where the current is carried out.

The SFH 309-4 phototransistor has a wide range of applications due to its excellent switching performance, reliability, andResponse Time of 20 us. It is mainly used in inductive sensors, proximity sensors, and optical switches. Additionally, it is often used to detect the presence or absence of objects, light levels, and magnetic fields. In industrial applications, SFH 309-4 can be used in light barriers, infrared receivers, Automatic Transport System (ATS), industrial automation, and alarm systems. They can also be used to detect and track objects in order to improve the performance of automated systems by reducing their cycle time and energy consumption.

In terms of operation, SFH 309-4 exhibits excellent performance in the face of high voltage and surge conditions. The integral shield surrounding the sensor also provides excellent protection against electrical interference, which means that it can be used in different environmental conditions without the risk of malfunction. They operate in ranges of -40° C to +85° C and possess a maximum current of 5mA .

Overall, SFH309-4 is a high quality photon transistor that is suitable for a wide range of applications, due to its level of accuracy and high degree of protection against electrical interference. Its excellent response times and switching performance make it particularly well suited for industrial applications, such as light barriers, proximity sensors, and ATSs.

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