Series:	*
Packaging:	Bulk
Part Status:	Active
Voltage - Collector Emitter Breakdown (Max):	30V
Current - Dark (Id) (Max):	100nA
Wavelength:	880nm
Viewing Angle:	24°
Power - Max:	100mW
Mounting Type:	Through Hole
Orientation:	Top View
Operating Temperature:	-40°C ~ 100°C (TA)
Package / Case:	Radial, 5mm Dia (T 1 3/4)

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Optical Sensors - Phototransistors

Optical sensors aredevices that are capable of detecting energy in the form oflight, and then converting it into an electrical signal. These sensors are usually used to detect events or to measure light intensity. One type of optical sensor, the phototransistor, is widely used in a variety of applications. In this article, we\'ll take a look at the application fields and working principle of the QSD123 phototransistor.The QSD123 phototransistor is a type of photo detector that is composed of two parts, a phototransistor and an LED. The phototransistor is connected to a circuit, and when the LED is exposed to light, the photons are detected by the phototransistor, which then produces a current in the circuit. This current is then used as a voltage. This voltage can be connected to various circuits, such as a data acquisition system, for various applications.The QSD123 phototransistor is commonly used in a variety of applications. The most common application is as a light sensing device. The phototransistor can detect light levels and can be used to detect changes in light intensity. In security systems, the QSD123 phototransistor can be used as part of an optical barrier or as a light detector for other purposes. Additionally, the QSD123 can be used to detect infrared and ultraviolet radiation, as well as other forms of electromagnetic radiation. Other applications are in medical analysis systems, industrial automation, and even robotics.The range of applications is not limited to light sensing. The QSD123 can also be used to measure temperature, chemical reactions, and even biosensors. This makes the phototransistor a versatile device for a wide range of applications.In addition to its many applications, the working principle of a phototransistor is also important. Phototransistors are based on the photoelectric effect, which occurs when a photon is absorbed by a semiconductor material. When this happens, a current is created. The current is then amplified by the transistor, making it easier to detect changes in light intensity. As the light level changes, so does the current in the circuit, which can then be used for various applications such as light sensing and data acquisition.The QSD123 phototransistor offers a variety of benefits over other phototransistors, including a low cost, a wide range of available light sensing levels, and a low power consumption. Additionally, the QSD123 offers a large breakdown voltage, an extended life cycle, and a high level of accuracy for light sensing.In conclusion, the QSD123 phototransistor is a versatile device that can be used for a variety of applications. From light sensing to data acquisition, the QSD123 is an ideal choice for a wide range of applications. Thanks to its low cost, wide range of available light sensing levels, and low power consumption, the QSD123 is a great choice for any application.

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