SDP8405-013

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Optical sensors, or more specifically phototransistors, are used to detect and measure more than just light. Phototransistors are light-sensitive semiconductors that can be used in a variety of applications, such as sensing UV radiation, flare and fire alarms, security systems, and the like. One such example of an optical sensor is the SDP8405-013. Below is a brief overview of this phototransistor\'s application field and working principle.

Application Field

The SDP8405-013 is a 600 to 600 nanometer optical sensor designed to pick up on invisible radiation near the visible spectrum, such as ultraviolet light. This phototransistor is mainly used to control pull-type switches, such as in automatic door openers. It can also be used for other switching or sensing purposes wherever an optical detector is needed.

Working Principle

The SDP8405-013 is a three-terminal device with an insulated PN junction and an LED detector. When invisible radiation from a light source hits the detector, it creates current flow through the terminals. When the current thus produced crosses a predetermined maximum, the phototransistor is triggered. When no detected radiation is present, the transistor remains turned off and current will not flow through the terminals.

This phototransistor is typically operated in an inactive mode, meaning that current will not flow through the terminal unless the sensor has been triggered. It operates as a “switching” transistor since it can be triggered to open or close an electrical circuit.

The SDP8405-013 is a reliable, accurate phototransistor that is easy to use and install. Its small size and low current makes it perfect for any application involving an optical detector.

In conclusion, the SDP8405-013 is a reliable, efficient, and cost-effective phototransistor. It is ideal for applications involving pull-type switches, such as door openers, and is small enough for any space. Furthermore, its three-terminal design and simple working principle make it easy to use and install.

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