SFH 221

Series:	--
Packaging:	Bulk
Part Status:	Active
Wavelength:	900nm
Color - Enhanced:	--
Spectral Range:	400nm ~ 1100nm
Diode Type:	PIN
Responsivity @ nm:	0.55 A/W @ 900nm
Response Time:	500ns
Voltage - DC Reverse (Vr) (Max):	10V
Current - Dark (Typ):	10nA
Active Area:	1.54mm²
Viewing Angle:	110°
Operating Temperature:	-40°C ~ 125°C
Mounting Type:	Through Hole
Package / Case:	TO-39-4 Metal Can

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Optical Sensors - Photodiodes

An SFH 221 photodiode is a miniaturized, integrated optoelectronic component that is used to sense/measure light intensity from a variety of sources. It is the essential building block used in optical communication systems, ranging from endpoint receivers, to transceivers, and even to switches. Photodiodes are capable of collecting information from ambient light sources, such as sunlight, incandescent, and fluorescent lighting. They react quickly to changes in the light intensity, and can detect changes in light much sooner than a traditional photoresistor. In certain circumstances, photodiodes can even be used to detect electromagnetic radiation from infrared to ultraviolet wavelengths. The SFH 221 photodiode is distinguished by its hermetic sealed, surface mount package which allows for easy installation and integration into a wide range of applications. The device\'s low power dissipation of 10 nW allows for low current and battery operation which makes it a suitable choice for battery-powered applications. It has a wide dynamic range that can reach up to 120 dB, permitting it to operate in environments that have large differences in luminance. The major application fields of SFH 221 photodiodes are optical communications, electronic imaging, spectroscopy, and motion detection. In optical communication systems, they are used as receivers and transceivers that are responsible for detecting incoming light signals and converting them into usable electrical signals. The SFH 221 can also be used in the field of electronic imaging as it has great sensitivity to visible and infrared light. The device is widely used in spectroscopy for the analysis of light and other electromagnetic radiation by collecting, measuring, and interpreting the data collected from various types of light sources. Finally, the SFH 221 device has been used in motion sensing applications as a low power, relatively low cost solution that can detect the presence or movement of objects.The working principle behind the SFH 221 photodiode is the same as any other type of photodiode; it uses thephotoelectric effect.The Photoelectric effect occurs whenever light energy is absorbed by a material which then causes the material to release electrons into the external circuit. The number of electrons produced is proportional to the light intensity received by the material, thus making it possible to measure light intensity or receive light signals by measuring the current change from the external circuit. The most commonly used configuration is the externally reverse-biased, Schottky diode, which is included in the SFH 221 device\'s specification. Electrons produced by the photoelectric effect can be collected from one of the Schottky diode\'s terminals. The current produced is then proportionately increased or decreased depending on the light level detected by the photodiode. The SFH 221 photodiode is a great device due to its low power dissipation, wide dynamic range, hermetically sealed surface mount package, and its low cost. It is suitable for many application fields, including optical communications, electronic imaging, spectroscopy and motion detection. Its working principle is based on the Photoelectric effect, making it highly efficient in converting light energy into useful electrical signals.

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