SLLA526B October   2020  – July 2022 ISO6720-Q1 , ISO6721 , ISO6721-Q1 , ISO6731 , ISO6740 , ISO6741 , ISO6741-Q1 , ISO6742 , ISO7021 , ISO7041 , ISO7131CC , ISO7140CC , ISO7140FCC , ISO7141CC , ISO7141FCC , ISO7142CC , ISO7142CC-Q1 , ISO721 , ISO721-Q1 , ISO721M , ISO721M-EP , ISO722 , ISO722-Q1 , ISO7220A , ISO7220A-Q1 , ISO7220B , ISO7220C , ISO7220M , ISO7221A , ISO7221A-Q1 , ISO7221B , ISO7221C , ISO7221C-HT , ISO7221C-Q1 , ISO7221M , ISO722M , ISO7230C , ISO7230M , ISO7231C , ISO7231C-Q1 , ISO7231M , ISO7240C , ISO7240CF , ISO7240CF-Q1 , ISO7240M , ISO7241A-EP , ISO7241C , ISO7241C-Q1 , ISO7241M , ISO7242C , ISO7242C-Q1 , ISO7242M , ISO7310-Q1 , ISO7310C , ISO7310FC , ISO7320-Q1 , ISO7320C , ISO7320FC , ISO7321-Q1 , ISO7321C , ISO7321FC , ISO7330-Q1 , ISO7330C , ISO7330FC , ISO7331-Q1 , ISO7331C , ISO7331FC , ISO7340-Q1 , ISO7340C , ISO7340FC , ISO7341-Q1 , ISO7341C , ISO7341FC , ISO7342-Q1 , ISO7342C , ISO7342FC , ISO7420 , ISO7420E , ISO7420FCC , ISO7420FE , ISO7420M , ISO7421 , ISO7421-EP , ISO7421A-Q1 , ISO7421E , ISO7421E-Q1 , ISO7421FE , ISO7520C , ISO7521C , ISO7631FC , ISO7631FM , ISO7640FM , ISO7641FC , ISO7641FM , ISO7710 , ISO7710-Q1 , ISO7720 , ISO7720-Q1 , ISO7721 , ISO7721-Q1 , ISO7730 , ISO7730-Q1 , ISO7731 , ISO7731-Q1 , ISO7740 , ISO7740-Q1 , ISO7741 , ISO7741-Q1 , ISO7741E-Q1 , ISO7742 , ISO7742-Q1 , ISO7760 , ISO7760-Q1 , ISO7761 , ISO7761-Q1 , ISO7762 , ISO7762-Q1 , ISO7763 , ISO7763-Q1 , ISO7810 , ISO7820 , ISO7821 , ISO7830 , ISO7831 , ISO7840 , ISO7841 , ISO7842 , ISOW7821 , ISOW7840 , ISOW7841 , ISOW7841A-Q1 , ISOW7842 , ISOW7843 , ISOW7844

 

  1.   Abstract
  2.   Trademarks
  3. 1Isolator Construction
  4. 2Switching Performance
  5. 3Isolator Lifetime through TDDB Test
  6. 4Solution Size
  7. 5Aging and Reliability
  8. 6Common-Mode Transient Immunity (CMTI)
  9. 7Optocoupler Current Input vs. Digital Isolator CMOS Voltage Input
  10. 8Conclusion
  11. 9References

Abstract

Galvanic isolation, generally just referred to as isolation, is a means of preventing DC and unwanted AC currents and avoiding a direct conduction path between two sections of a system while still allowing signal and/or power transfer between those two sections. Semiconductor devices that offer galvanic isolation are referred to as isolators. Optocouplers are one of the first isolators to be introduced in the semiconductor industry and have dominated the industry for several decades as an exclusive isolation technology.

With semiconductor technological advances in the last couple decades, there are many other isolation technologies, like capacitive and magnetic isolation, that offer similar functionality as optocouplers with better overall performance. Among the competing technologies, TI’s silicon dioxide (SiO2)-based digital isolation technology offers superior performance, especially on high voltage rating, electrical characteristics, switching characteristics and reliability. This white paper compares TI digital isolators to some of the commonly available optocouplers with respect to various performance parameters. To compare TI digital isolators to optocouplers in standard interface circuits, please refer to the application brief, How to Replace Optocouplers with Digital Isolators in Standard Interface Circuits.