HMHA281R4V

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Optoisolators are electronic devices used to transfer electrical signals across two isolated electrical networks, which are typically referred to as galvanic isolation. One common type of optoisolator is the transistor, photovoltaic output (TPO) optoisolator, such as the HMHA281R4V. This optoisolator is used for digital logic output applications and consists of a light-emitting diode (LED) coupled to a phototransistor. The device is rated for a maximum power of 5 mW, with a typical response time of 1 µs and a maximum isolation voltage of 5000 V.

The HMHA281R4V optoisolator is used to electrically isolate electronic circuits in industrial automation, household appliances, and automotive applications. This optoisolator provides high isolation voltage between its input and output circuits, which protects circuits in the event of a high-voltage surge or short circuits. The device also prevents ground loops which can cause malfunction in sensitive electronic equipment. The device also acts as an electrical buffer for analog signals, reducing noise interference from both sides of the isolation barrier. This optoisolator is capable of operating temperatures between -45°C to +90°C.

The working principle of the optoisolator is based on the principles of photovoltaic conversion. The LED on the device is energized by the input current, which causes it to emit light that is detected by the phototransistor on the device. This causes the phototransistor to produce a current proportional to the input current. The output current is then directed to the output circuit, providing isolation from the input circuit.

The device also incorporates built-in safety features to protect its components from damage. The LED on the device is enclosed in a transparent housing which limits the amount of light that can enter the phototransistor, preventing it from getting overloaded. Additionally, the LED is reverse-polarity protected to ensure reliable operation in the event of reversed wiring. The device is also tested for noise interference and lightning protection, making it suitable for a variety of applications.

The HMHA281R4V optoisolator is an ideal choice for digital logic output applications, as it provides high performance and reliable isolation between input and output circuits. The device also provides protection from voltage surges, ground loops, and noise interference, making it suitable for a variety of applications. The device is available in surface mount or thru-hole packages, depending on the user’s requirements, and is designed to withstand temperatures between -45°C to +90°C.

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