SI8621EC-B-IS

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Digital isolators are a crucial element of many electronic designs, enabling efficient and reliable communication of data and electrical isolation. The SI8621EC-B-IS is a digital isolator from Silicon Laboratories that provides electrical isolation of up to 1.4 kV while transferring up to 5 Mbps of digital logic output signals. This devicde has achieved a VDE 0884 certificate, which makes it suitable for conforming to the VDE safety standards.

Application Field

The SI8621EC-B-IS digital isolator from Silicon Laboratories is optimized for Industrial Automation applications such as Programmable Logic Controllers (PLCs), Motor Drives, and Measurement and Control systems. It is also being used in medical instrumentation applications such as patient lead cable isolators, usage metering systems, and patient lifecare monitors. Furthermore, its high-speed features make it suitable for usage in automobile engine control systems, airbag control systems, and battery management systems.

Working Principle

The SI8621EC-B-IS isolator, as with other digital isolators, uses a capacitor-based isolation architecture which enables high-speed data transmission while providing reliable electrical isolation. Two miniature integrated circuits are connected by two capacitors; one serves as the transmitting end and the other as the receiving end. When an input signal is applied to the transmitting end, it creates a voltage difference between the two ICs. This voltage difference causes current to flow through the capacitors and creates an electrical field that transports data across the isolation barrier. These data bits are then received at the receiving end IC and interpreted by the device.

The device operates with two single ended signals, which is the most efficient way to provide electrical isolation without compromising signal integrity. The resulting data rate is up to 5 Mbps and the isolation voltage rating is up to 1.4 kV. The performance of the SI8621EC-B-IS is also reinforced by its high-speed, low-noise operation and excellent common mode reject ratio (CMRR).

Conclusion

The SI8621EC-B-IS is a high-performance, low-cost digital isolator designed specifically for industrial automation applications. Its high-speed features and excellent noise immunity make it suitable for various applications such as PLCs, motor drives, engine control systems, airbag control systems and battery management systems. It provides high-speed data transmission with reliable electrical isolation of up to 1.4 kV. The device is also certified to the VDE 0884 safety standards, making it an excellent choice for data isolation in various industrial and medical applications.

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