SFH 309 FA-5 RN18A

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Optical Sensors - Phototransistors are used in a wide range of applications to sense the presence of light from the infrared to the ultraviolet ranges. SFH 309 FA-5 RN18A is a phototransistor manufactured by Osram Opto Semiconductors that uses a monolithic structure and is designed for operation in the visible range of light. It is specially designed to be widely used in consumer and industrial applications.

The SFH 309 FA-5 RN18A is based on an NPN transistor structure and uses a silicon-based phototransistor die with a 5.0 mm diameter package and is encapsulated in a plastic housing. The phototransistor is sensitive to ambient light in the visible light range of 300 to 1100 nm and is capable of operating in a wide range of temperatures from -40 to +85 °C. It has a typical gain of 8mV/mA, a current gain of 72, and a typical collector-emitter voltage of 5V when operated with a base current of 100mA.

The SFH 309 FA-5 RN18A has a wide range of applications, particularly in the areas of light sensing and detection. Its wide detection range makes it particularly useful in applications that require sensing of ambient light levels in order to adjust display brightness or lighting levels. It can be used for light detection in retail and industrial lighting systems or for controlling display brightness in digital instruments, computer monitors, TVs and displays.

The working principle of the SFH 309 FA-5 RN18A is based on the phototransistor effect. When exposed to light, the optical radiation is converted into electrical signals which impact the collector-base junction and cause current to flow. This current is then amplified in the collector-emitter junction and appears at the output. It can also be used to sense the presence or absence of light by detecting when the current output level exceeds a given threshold value. By applying reverse bias voltage to both the collector and emitter, it is possible to detect light sources from a distance of up to several meters.

In summary, the SFH 309 FA-5 RN18A is a highly versatile phototransistor manufacturer by Osram Opto Semiconductors that is widely used in a range of industrial and consumer applications. It is based on an NPN transistor structure, and uses a monolithic silicon-based die with a 5.0 mm diameter package, and is encapsulated in a plastic housing. It is sensitive to ambient light in the visible light range of 300 to 1100 nm, and is capable of operating in a wide range of temperatures. The working principle of the SFH 309 FA-5 RN18A is based on the phototransistor effect, converting light into electrical signals and allowing detection of light sources from a distance of several meters.

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