PT42-21B/TR8

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Optical Sensors – Phototransistors, a type of transistors based on the occupancy of light, are popularly used for many purposes. The PT42-21B/TR8 optical sensor is one of the many devices used to detect a variety of objects and parameters in the physical world. It is an ideal fit in buzzer or warning applications. This device is made with high-performance bipolar technologies that make it reliable and provide a consistent photo-current for greater accuracy.

The physical structure of PT42-21B/TR8 consists of a collector pin and an LED. These pins are connected to the circuit board where the device is mounted. The device also contains an integrated light-focus lens which allows the LED and collector pins to track and fine-tune the object received from the ambient environment. This device is a high-accuracy photo-transistor and does not require an external power source as it uses the photo-current created by the light intensity to operate.

The PT42-21B/TR8 is designed with an NPN package which offers improved active-mode current gain at very low currents. This makes the device suitable for ultra-low current applications where current is supplied by a single photodiode. This device has a pair of photo-transistors which reduce the power consumption, improves the response time and reduces light source contamination. The ambient light is usually measured in Lux and this device can work with Lux from 0 to 18,000 Lux.

The working principle behind the PT42-21B/TR8 is simple. When the device receives a light source within its range (0-18,000 Lux), it uses its phototransistor to transform the light into electric current. This electric current is then used to activate the device and detect the object. When activated, the current is sent through the collector pin to the circuit, which is then used to detect and measure the intensity of the light source. As the intensity of the light source increases, the current on the collector pin will increase, allowing for accurate readings.

The PT42-21B/TR8 is a useful device for applications such as traffic lights, smoke detection systems, automotive sensors, motion detectors, and other automated systems. This device offers reliable detection within its working area and is also able to sustain high power levels while emitting less visible light. This makes it a great choice for applications where light leakage needs to be reduced. The device has a long life-span of up to 25 years and is not vulnerable to temperature, pressure or humidity changes.

The PT42-21B/TR8 is an excellent choice for applications that require reliable light source detection. Its rugged construction and low-power capabilities provide reliable measurements and improved overall system performance. The device is available in a range of sizes and is designed to fit a wide range of applications. It is an effective solution for applications where accurate light source detection is important.

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