OPB871T51

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Optical Sensors are the most versatile and widely used sensing technologies to detect or measure objects or parameters without physical contact. Photointerrupters in particular, are devices used to distinguish objects and detect position and speed. A Slot Type, Transistor Output Photointerrupter, such as the OBP871T51, features a high-speed response, with an LED output emitting short-connecting near infrared rays and a phototransistor detecting these rays, integrated within a single package.

The OBP871T51 Photointerrupter was specifically designed to detect the presence of a passing object in a wide range of both indoor and outdoor applications, such as factory automation and security systems, vending machines, office automation and home appliances. It is also optimised for use in automotive applications such as window lift detection, key detection, and sunroof, front grille, or tailgate position detection.

The OBP871T51 features a slim type housing agreement with a slit width of only 2mm, the smallest among conventional slot type photointerrupters. It has a 0.55mm nominal slot width, providing a clear and precise detection even at high-speed operation, superior noise immunity and a wide current transfer ratio. The OBP871T51 also features a low-power output of 40μA, a long operating life of 100 thousand operations minimum and a wide operating voltage range of 5V to 24V. The OBP871T51 also offers advanced durability, with 50-year storage life and a heat resistance rating of up to 105℃.

The OBP871T51 operates with a working principle based on the functional principle of a phototransistor. This means that a phototransistor detects light, usually near-infrared light which does not affect the human eye. To ensure optimum performance, the gap between the LED and the phototransistor must be small, preferably less than 0.35mm. When the OBP871T51 is illuminated with a near-infrared light source, it provides an output current, with the current proportional to the amount of sensed light.

The OBP871T51 utilizes a high-speed response of up to 1kHz, with a response time of 200µs (on-state) and 50µs (off-state). The OBP871T51 also features a double insulation substrate and plastic housing which help reduce interference from external electric fields, improving the reliability and inhibiting external influences that may cause performance problems. Additionally, the OBP871T51 Optical Sensor also utilizes light-shielded window construction which helps enhance environmental resistance to dust, dirt and moisture, assuring improved detection reliability.

In conclusion, the OBP871T51 Photointerrupter is a high-performance, multi-functional 2mm Photointerrupter, optimised for use in a range of indoor and outdoor applications. Its high-speed response, low-power output, long-operating life and wide operating voltage range make it ideal for factory automation systems, automotive applications and many other applications. It utilizes a working principle based on the functional principle of a phototransistor, and has a range of features which provide robustness and reliability, making the OBP871T51 the perfect choice for secure and precise detection of an object in any environment.

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