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Optical Sensors - Photointerrupters - Slot Type - Transistor Output

The OPB871P51TX is a photointerrupter device designed to detect objects which pass through an opening or slot. It is a slot type photointerrupter with transistor output, which means it has a light transmitting element and a photo sensor IC packaged together in a single component, and a transistor output. This makes it well suited for a wide range of applications in industries such as automotive, industrial automation, factory automation, and medical, where a reliable detection of passing objects is required.

Application field

The OPB871P51TX photointerrupter is designed primarily for applications that require the detection of a variety of objects, such as coins, keys, bags, or labels, as they pass through a slot. This device can detect a wide range of objects, regardless of their color, shape, or size. The applications made possible by this device include automotive or industrial automation systems, food and beverage production lines, medical equipment, data processing systems, and more. The OPB871P51TX offers excellent sensitivity for reliable detection of these target objects.

Working principle

The OPB871P51TX uses infrared light emitting diode (LED) and a phototransistor, which are packaged together in a single component. The LED light is directed through a gap in the package, and the phototransistor is positioned within the package such that it can detect the light transmitted by the LED. When an object passes through the gap, it breaks the light beam, triggering the phototransistor and producing an electrical signal. This signal can then be used to detect the passing object, which can then be used in the control of other components.The OPB871P51TX can also operate in the reverse by using the current passing through the LED and phototransistor to detect the object.

The OPB871P51TX has a number of useful features which make it ideal for a wide range of applications. It is designed with an extended operating temperature range from -40 to 80°C, and it is also RoHS compliant. It has a package size of 14.2 x 7.1 x 3.6mm, providing good optical alignment and a high level of reliability. In addition, it has a built-in hysteresis circuit, which enables it to detect objects passing through a narrow gap (3mm) without false detection.

The OPB871P51TX is a reliable and cost-effective solution for applications which require the detection of objects passing through a slot. Its wide range of features, including its extended operating temperature range, RoHS compliance, small package size, and exemplary optical alignment, make it ideal for a wide range of applications in industries such as automotive, industrial automation, factory automation, and medical.

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