Circuit & System Protection


On-chip capacitive digital isolators

22 March 2006 Circuit & System Protection

Texas Instruments' ISO721 and ISO721M digital isolators have a logic input and output buffer separated by a silicon oxide (SiO2) insulation barrier. This barrier provides isolation of up to 560 V of operating voltage or 4000 V peak overvoltage transient. The ISO721M is suited for applications requiring fast digital data to be transmitted with low incidence of system noise. The ISO721 is more flexible and robust for transmitting data in noisy environments.

By using on-chip, high-voltage capacitors, TI says the isolators transmit data up to three times faster while using less power than commonly-used high-performance optocouplers. In addition, its capacitive technology offers the advantage of immunity from external magnetic fields that frequently occur in the industrial environment and can distort signal integrity. These devices also offer high immunity against data corruption due to fast voltage transients, providing a minimum protection level of 25 kV/μs.

For more information contact Arrow Altech Distribution, +27 (0)11 923 9600, Avnet Kopp, +27 (0)11 809 6100 or EBV Electrolink, +27 (0)21 402 1940.



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