Two SiO2 high voltage capacitors provide isolation in capacitive digital isolators (Image: Texas Instruments).ĬMOS-based digital isolators are available with isolation ratings of 5 kV, provide compliance to compliance to IEC 6, and include 10 kV surge protection as required by IEC 60065. In addition, SiO2 can withstand extended exposure to ambient moisture, operates well at elevated temperatures, and produces an isolation barrier with a life expectancy of over 50 years. SiO2 has a higher dielectric strength than can be delivered by an optocoupler. Optocouplers can also be used for isolated signal transmission but are unidirectional and have a different set of performance characteristics.Ĭapacitive digital isolators use silicon dioxide (SiO2) based high voltage capacitors to provide the isolation barrier ( Figure 1). Capacitive isolators are not susceptible to magnetic energy and can support high data rates with low power consumption. Since they are based on capacitive coupling, these digital isolators can’t pass DC signals. They are used in power converters and motor drives, electric vehicles (EVs), consumer devices, data acquisition and industrial automation equipment, test and measurement equipment, green energy, and medical systems. The barrier provides galvanic isolation to meet safety regulations, reduce noise from ground loops, and connect interface communication boards or subcircuits that operate with different supply voltages. Capacitive digital isolators consist of two digital CMOS dies connected with a capacitive isolation barrier.
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