QSE114

Series:	*
Packaging:	Bulk
Part Status:	Active
Voltage - Collector Emitter Breakdown (Max):	30V
Current - Dark (Id) (Max):	100nA
Wavelength:	880nm
Viewing Angle:	50°

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Optical Sensors - Phototransistors

Phototransistors are electronic components that sense light and output signals in response. They are commonly used in applications that require sensing of light or other optical information, such as photodetectors, optical alarms, occupancy sensors, and security systems. The QSE114 is one type of phototransistor, designed for use in applications where light intensity needs to be measured or monitored.The QSE114 is an NPN silicon phototransistor housed in a small sealed plastic package. The package includes a glass window that is positioned directly in front of the base-collector junction on the transistor. When exposed to light, this junction emits a small electrical current. This current can then be used to measure the amount of light that is present in a given environment.The most common applications for the QSE114 phototransistor are in optical alarms and occupancy sensors. An optical alarm uses the phototransistor to detect the presence of an intruder, activating an alarm if someone is detected. Occupancy sensors use the phototransistor to detect the presence of a person in a room or area. In both cases, the phototransistor yields a voltage output that is proportional to the amount of light present.The QSE114 also has a number of features that make it a desirable choice for optical sensing applications. The transistor has an unusually wide spectral response range that is able to detect a wide range of light sources, including both visible light and infrared light. Additionally, the device is highly reliable and has a low operating voltage. Its compact and lightweight package makes it easy to install in a wide range of products and applications.In order to use the QSE114 phototransistor effectively, it is important to understand its working principle. The phototransistor employs thephotoelectric effect, which states that when light is shone onto a conductor, an electric current will be produced. In the case of the QSE114, this light is shone onto the base-collector junction of the transistor and a current is then generated. This current can then be used to measure the amount of light in the surrounding environment.The QSE114 phototransistor also has a range of advantages and disadvantages that should be taken into account when selecting it for use in a particular application. On the positive side, it is highly reliable and easy to install, while its wide spectral response means it can detect a broad range of light sources. On the downside, its package is not suitable for harsh or extreme environments, and it is only able to detect light intensity rather than direction.Overall, the QSE114 is a highly useful phototransistor for a wide range of applications. Its features make it ideal for sensing light intensity in optical alarms, occupancy sensors, and security systems. By understanding its working principle and features, engineers are better equipped to choose the best phototransistor for their particular projects.

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