SFH 309 FA-4/5

Series:	--
Packaging:	Bulk
Part Status:	Active
Voltage - Collector Emitter Breakdown (Max):	35V
Current - Collector (Ic) (Max):	15mA
Current - Dark (Id) (Max):	200nA
Wavelength:	900nm
Viewing Angle:	24°
Power - Max:	165mW
Mounting Type:	Through Hole
Orientation:	Top View
Operating Temperature:	-40°C ~ 100°C (TA)
Package / Case:	Radial, T-1 Lens

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Optical Sensors - PhototransistorsPhototransistors are a type of light-sensitive semiconductor that utilizes photoconductivity to convert photon energy into electric current. Photo-transistors have a wide range of applications, with one of the most common being for the measurement of light intensity. This is the general field of application of the SFH 309 FA-4/5, a Photo transistor produced by Siemens.The SFH 309 FA-4/5 is an NPN silicon phototransistor with Narrow-band, Infrared Sensing Spectrum. These phototransistors are designed to detect narrow-band infrared frequencies, typically within the range of 880-940nm, with peak responsivity at around 900nm. They are particularly well suited for pulse sensors or other applications where fast switching and high frequency operation are required. The SFH 309 FA-4/5 has an epoxy moulding for improved ruggedness and is capable of operation from -40°F to +150°F. The working principle of the SFH 309 FA-4/5 is the same as that of all phototransitors -- the phototransistor is placed close to the source of light, with its base facing away from the source. When light reaches the base, it causes electrons to be generated, which in turn leads to a flow of current through the transistor, and then to its output. The switching speed of the SFH 309 FA-4/5 is typically in the range of microseconds, and it has a minimum current gain of 50.The SFH 309 FA-4/5 is a versatile phototransistor with a wide range of applications, from simple light intensity measurements to more complex pulse detection. It is particularly well suited for applications that require fast response time and high power consumption, as well as for applications in extreme temperatures.The SFH 309 FA-4/5\'s versatility is demonstrated by its ability to be integrated into a wide range of systems and devices. It is suitable for use in outdoor, rugged environments, including on construction sites, in hazardous areas, and in security applications. It is also used in a variety of automotive applications, such as signal lighting, airbag sensors, brake sensors, and more. Additionally, this phototransistor is also used in a variety of industrial applications, including process control, non-contact temperature sensing, and object detection.In addition to its versatility and robust design, the SFH 309 FA-4/5 is also an efficient and cost-effective solution for optical sensing applications. It is low-cost and can be widely accepted for its compatibility with most types of surface mount printed circuit boards. Furthermore, the SFH 309 FA-4/5 is capable of self-biasing operation without any external components and offers a processing speed of 10-100kHz. The SFH 309 FA-4/5 from Siemens is a high-performance phototransistor that offers a wide range of applications for optical sensing. It is a cost-effective solution for fast switching and high-frequency operation in extreme temperature environments. With its robust design, low power consumption, and high reliability, the SFH 309 FA-4/5 is a highly versatile solution for applications where fast and reliable optical sensing is required.

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