SI8641EB-B-IU

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Digital Isolators

Digital isolators are electronic components that are capable of providing galvanic isolation between two or more circuits. They play an important role in providing electrical insulation between circuits, and are extensively used in the fields of automation, test and measurement, and industrial control.

The SI8641EB-B-IU is a digital isolator IC from Texas Instruments. It provides galvanic isolation between two digital signal lines and is suitable for applications in which the signals must be electrically isolated in order to prevent crosstalk or ground loops from disrupting the signal transmission. It also helps in protecting the control system from electrical noise, and in extending the length of a signal line by removing capacitive and inductive loading.

Application Field

The SI8641EB-B-IU digital isolator IC is designed for operation in systems ranging from 5V to 36V. It is mainly used in industrial control, instrumentation, and automation applications, such as EtherCAT, CANopen, generic fieldbuses, high-speed Ethernet, motion control, alarms, lighting control, and other signal isolation applications.

The SI8641EB-B-IU is also ideal for medical equipment, such as patient monitoring and imaging systems, which require isolation between circuits for patient safety reasons. In addition, it is suitable for various applications involving isolated interfaces such as 3-wire coin acceptor interface, digital switches, and digital temperature control.

Working Principle

The SI8641EB-B-IU isolator IC utilizes transformer coupling technology to achieve high-speed signal transmission and electrical isolation between two signal lines. The device is implemented using low-saturation (LS) Thin Film (TF) transformers with an isolation voltage of 2.5KV, providing a high degree of immunity against noise and overvoltage transients.

The device provides a data transfer rate of 20 Mbps and common-mode transient immunity (CMTI) of up to 25kV/µs. The integrated ESD protection helps to increase its robustness, and it can withstand shock and vibration up to 8G and 20G respectively.

The SI8641EB-B-IU is designed to operate at temperatures ranging from -40°C to 125°C, making it suitable for use in extreme environmental conditions. The integrated oscillator also helps to maximize the output signal integrity over supply voltage and temperature variations.

Conclusion

The SI8641EB-B-IU digital isolator IC from Texas Instruments is designed to provide galvanic isolation between two digital signal lines. It is mainly used in industrial control, instrumentation, and automation applications, such as EtherCAT, CANopen, generic fieldbuses, high-speed Ethernet, motion control, alarms, lighting control, and other signal isolation applications. Furthermore, it provides a high degree of isolation and data transfer rate of 20 Mbps, making it an ideal choice for various applications requiring isolated interfaces.

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