SDP8436-003

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Optical Sensors - Phototransistors are used to detect and convert light energy into electrical energy. The SDP8436-003 Phototransistor is a device which enables users to detect light and respond according to its intensity and wavelength. They are typically used in applications where a user would need to detect, measure, or respond to levels of light such as in photography, instrumentation, Robotics, Auto-Tracking Systems, and Machine Vision.

The SDP8436-003 Phototransistor is a controller component consisting of a bipolar NPN junction transi stor with a visible light-sensitive silicon photodiode built-in. This device has a range of different attributes which enables it to be used in a range of different applications. Firstly, the device is able to operate in both parallel and serial modes. In the parallel arrangement, the central transistor acts as an amplifier, while the monolithic silicon photodiode sees the light. Secondly, the device has a wide range of response times, from 0.5 to 6.0ms, which is suitable for a wide range of applications.

The SDP8436-003 Phototransistor is also able to detect light according to specific wavelength ranges, which makes it suitable for applications requiring precise detection of certain wavelengths. This device is also capable of detecting a wide range of intensities of light, from low to high, accompanied by an adjustable base current. The device contains adjustable series resistors to help control the voltage thresholds in terms of the dark current and the light current.

Moreover, this device allows the user to choose between a single-transistor and a double-transistor configuration, with the latter allowing for higher sensitivity. Furthermore, it has a great level of accuracy at very low temperatures and moderate temperatures.

In terms of the working principle of this device, light from the outside is applied to the silicon photodiode. The photodiode then converts the incident light into electrical current which is applied to the base of the central transistor. This current is then fed to the emitter electrode as a function of the light intensity. When the transistor is on, the central voltage will be dropped to a certain degree resulting in a digital signal to be read. This process is repeated in a loop until the difference in current between the emitter and the collector is detected, at which point a signal will be produced.

In conclusion, the SDP8436-003 is a versatile and accurate device used for detecting and measuring light intensity and wavelength. It is suitable for a wide range of applications such as photography, instrumentation, Robotics, Auto-Tracking Systems, and Machine Vision. This device allows users to control the voltage threshold by adjusting the series resistor, as well as giving users the option to choose between a single-transistor and a double-transistor configuration.

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