IS281B

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Optoisolators are electronic components designed to provide electrical isolation between two circuits. They are used in a variety of applications from healthcare to automotive engineering and have become increasingly important for safety reasons. IS281B optoisolators belong to the family of transistor, photovoltaic output optoisolators.

IS281B Overview

The IS281B optoisolator has a transistor output stage allowing the LED to be driven independently from the detection circuit. The electrical isolation provided by the optoisolator ensures that there is no electrical connection between the control and load circuits and with a breakdown voltage of 2500 Vac, it is perfect for safety critical applications.

The IS281B provides excellent noise immunity between circuits with a safety insulation of up to 5 kV. This high level of insulation ensures that the components will operate reliably even in harsh environment such as on board vehicles or in public spaces.

The built-in LED, photodiode and transistor in the IS281B provide for high switching speeds of up to 60kV/us at 500 mA. It has a short circuit and no load detection which allows for detection of the optical signal, or a short-circuit failure in the system.

Application Fields

The IS281B optoisolator is used in a wide range of applications due to its noise immunity and high reliability. These applications include safety circuits, motor control systems, industrial equipment, elevator systems, automotive and aerospace, and power supplies.

The IS281B is also widely used in modern healthcare equipment, such as imaging equipment, patient lifts, and ventilators. The high voltage isolation ensures that electrical noise generated by machines and equipment does not interfere with sensitive medical equipment.

Since the IS281B has a lower operating voltage than other optoisolators, it can be used in energy-saving LED lighting in areas such as offices, homes, and in the automotive industry.

Working Principle

The IS281B optoisolator consists of an LED, photodiode, and a transistor. The LED emits a signal which is then detected by the photodiode. This generates a current which is transferred to the transistor, which then acts as a switch and turns the circuit ON or OFF.

The optoisolator provides an electrical isolation between the input and output circuits, meaning no electrical connection is established between them. This means that even if one circuit fails, the other circuit remains unaffected.

Due to its design, the IS281B optoisolator provides an effective, secure, and reliable electrical isolation with very low insertion losses. It is suitable for demanding applications, providing excellent noise immunity and long-term reliability.

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