QSD733

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Optical Sensors - Phototransistors use light (radiation) to provide a current flow between the collector and emitter terminals of a transistor. Phototransistors were first developed in the early 1960s and are now commonly used for a range of applications, from industrial automation to lighting control. Among the variety of available commercial phototransistors, the QSD733 is a particularly versatile device. This article will discuss the application fields and working principle of the QSD733.

The QSD733 is a phototransistor with a built-in optical amplifier, making it highly sensitive to light intensity. This means that the device can detect relatively small changes in light levels, which makes it well-suited for applications that require accurate sensing of ambient or relatively low-intensity lighting. The device is especially good for detecting near-infrared, visible, and ultraviolet light sources, such as those used in handheld lighting applications.

The device’s high sensitivity and low power consumption, coupled with its small size (1.8 mm x 2.1 mm x 0.3 mm) and low cost make it an ideal choice for many applications. The phototransistor can be used in a variety of settings, from nighttime lighting control to medical imaging, from low-level robotic movement to optical sensing for security systems. It can also be used as a signal source for a range of other instruments, such as light meters.

In addition to its many commercial uses, the QSD733 phototransistor can also be used for educational purposes. That’s because the device includes an example circuit that demonstrates how a phototransistor works. This circuit shows how the light intensity hitting the phototransistor can be converted into an electrical output. This makes it a great choice for those interested in learning more about how phototransistors work.

The working principle of the QSD733 is relatively simple. The device is powered externally and the phototransistor collects light and converts it into an electrical signal. The current generated by the light is directed to the device’s collector terminal, where it is amplified by the built-in optical amplifier. The amplifier then boosts the signal and sends it out through the device’s emitter terminal. This amplified current can then be used for various purposes, such as controlling the intensity of lighting.

To summarize, the QSD733 is a versatile phototransistor that can be used for a variety of application fields, from industrial automation to medical imaging. Its small size, low power consumption, and built-in optical amplifier give it a high sensitivity to light levels, which makes it ideal for detecting changes in light intensity. Finally, the device’s example circuit provides a great resource for those interested in learning about phototransistors and how they work.

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