HOA1874-012

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Optical Sensors - Photointerrupters - Slot Type - Transistor Output

The HOA1874 series photointerrupters are designed to detect the presence of an object using optoelectronics. These devices feature a slot-shaped conductor that operates in the transmission mode. They incorporate a compact package size and offer a reliable electrical circuit isolation. The output of the HOA1874 series consists of complementary NPN and PNP transistors with built-in LED (light-emitting diode) which provides long-distance insulation between the input and output circuitry.

Application Fields

The HOA1874 series photointerrupters are perfect for a variety of applications including automatic management systems, safety controls, anti-theft systems, water and gas meters, paper length and width detectors, printing systems, optical switches, motion/presence detectors, and elevator controls. With its high switching speed, compact package size, and low current consumption, the HOA1874 series is perfect for providing reliability and efficient operation in various industrial and commercial applications.

Working Principles

The HOA1874 series photointerrupters are designed to reliably detect the presence of an object or passage of time. The device consists of a compact plastic package with an integrated LED and phototransistor. The LED acts as an emitter and the phototransistor as a receiver. In the presence of light, the phototransistor is activated and produces a low-level output. The presence or passage of an object through the slot diffuses the LED light, which causes the phototransistor to deactivate, thus producing a high-level output. The switching speed of the HOA1874 series photointerrupter is remarkable and can operate up to 1 kHz.

Structure Design

The HOA1874 series photointerrupters feature a highly reliable slot-shaped conductor and a well-structured design that provides insulation between the input and output circuitry. The device consists of an integrated LED and phototransistor, which are embedded into the interior of a small package. These components are surrounded by a plastic housing which diffuses the LED light and provides a reliable electrical signature.

Output Formats

The HOA1874 series photointerrupters come in various output formats including complementary NPN and PNP transistors. The operating voltage can range from 0.2V to 1V, depending on the model. Most models feature a stand-off voltage of 5V and an I/O isolation voltage of 50V. The output format ensures maximum reliability when used in conjunction with various kinds of load sensing circuits, such as a relay or motor.

Conclusion

The HOA1874 series photointerrupters are reliable and efficient devices perfect for applications where high switching speeds are needed. These devices are designed to detect the presence or passage of an object and deliver reliable outputs in complementary NPN and PNP configurations. Despite its compact size, the device is capable of providing long-distance insulation between the input and output circuitry. The HOA1874 series proves to be an ideal solution for a variety of applications, ranging from safety control to printing systems and elevator controls.

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