SFH 320-Z

Series:	TOPLED
Packaging:	Tape & Reel (TR)
Part Status:	Active
Voltage - Collector Emitter Breakdown (Max):	35V
Current - Collector (Ic) (Max):	15mA
Current - Dark (Id) (Max):	50nA
Wavelength:	980nm
Viewing Angle:	120°
Power - Max:	165mW
Mounting Type:	Surface Mount
Orientation:	Top View
Operating Temperature:	-40°C ~ 100°C (TA)
Package / Case:	2-LCC (J-Lead)

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Optical Sensors – Phototransistors: SFH 320-Z Application Field and Working Principle Optical sensors are a class of sensing devices that detect light energy, also known as photons, in order to determine the properties of an object or environment. Phototransistors, a type of phototransducer, are photoemitting devices that convert light into an electrical current. In particular, the SFH 320-Z phototransistor is widely used in applications ranging from automotive, industrial, medical, and consumer electronics. The SFH 320-Z is a Silicon NPN phototransistor that uses a broad internal spectrum, a wide viewing angle, and a high-speed response time. All of these features contribute to the device’s outstanding performance in light detection. Specifically, it is fast enough to effectively detect the weak pulse of photomultiplier tubes and is extremely sensitive towards visible light (<300 nanometers). Additionally, the SFH 320-Z is very reliable for a phototransistor device, boasting an industry-leading service life of nearly two decades. The SFH 320-Z is a two-pin device, with one pin functioning as the emitter and the other the collector. Light striking the base of the phototransistor is absorbed, which creates an electric field that in turn releases electrons from the power source. This releases a current flow from the collector to the emitter, enabling the device to detect the presence of a light source.The SFH 320-Z possesses a variety of uses in different fields. In the automotive industry, the device is typically used in a host of electronic driver assistance systems, such as Advanced Driver Assistance Systems (ADAS). In industry use, phototransistors are used in scanners, printers, copiers, and other machines that are sensitive to light and must be able to distinguish between objects of different colors.In the medical field, the SFH 320-Z is used in an array of devices that require light detection, such as glucose meters, endoscopes, glucometers, dental imaging systems, and blood hemoglobin meters. Given its broad spectral range, paired with its compact size, the SFH 320-Z is used in a range of consumer electronics, such as cellphones, game consoles, digital cameras, and audio/video equipment.Despite its wide range of applications, the SFH 320-Z is not without its drawbacks. Its small size can limit its detection range, and if exposed to direct, strong sunlight, the device can be damaged from overexposure. It also has limited maximum current conduction and switching speeds, which can limit its use in certain applications. Despite its drawbacks, the SFH 320-Z remains a popular phototransistor device due to its high performance when detecting weak pulses and its broad spectral range. It is an important device in the field of optical sensor technology, thanks to its widespread use in many industries and its long service life.

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