SI88221EC-IS

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Digital isolators are invaluable components that are used to prevent potential currents from crossing from one node to another. Digital isolators allow digital signals to pass between two circuits without allowing them to interact. The SI88221EC-IS, a special type of digital isolator created by ROHM, is a bi-directional digital isolator with 1-channel isolation that can achieve high-speed communications between the two ends of the circuit with low propagation delay.

The SI88221EC-IS is a superb chip for digital isolators, providing a long isolation life of 40 years as well as quick response time of 8.5ns. Its low stand-by power technology also significantly reduces power consumption. The operating temperature range is -40~105℃ and its surge withstand capability is up to 2.5kV (IV=Relative Humidity 45%).

The application field of SI88221EC-IS digital isolator includes industrial HPC and PLC applications, power automation systems, motor control systems, server storage systems, and digital audio systems. The signal conduction of the SI88221EC-IS is unaffected by electrical noise or other such disturbances, making it ideal for applications where signal conduction is of high importance.

The working principle of the SI88221EC-IS is based on the Photo MOSFET. The device is made up of two separate infra-red emitting diodes that are in turn connected to two pairs of Photo MOSFETs. On either side of the isolator, an incoming signal is converted by the diode into an infra-red light, which is then absorbed by a Photo MOSFET on the opposite side. This Photo MOSFET is then converted into an electric signal, which is then output to the device.

The Photo MOSFET used in the SI88221EC-IS digital isolator presents several advantages. It allows a wide common mode range, and is immune from radiated and conducted disturbances due to its use of optical technology. This reduces the need for signal filtering, resulting in a more efficient operation. Furthermore, it has a wide operating temperature range and high speed response time.

In summary, the SI88221EC-IS is a great digital isolator for applications that require a high-speed response with long isolation life. Its use of Photo MOSFET technology allows a wide common mode range and immunity from noise, making it a great choice for noise-sensitive applications. Its low power consumption also makes it a great choice for industrial and other similar applications.

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