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[FAQ] What is Distance Through Isolation (DTI)?

What is Distance Through Isolation (DTI)?

  • Please note that all definitions and references are based on the latest standard IEC 60747-17


    DTI – Distance Through Isolation. The smallest distance between two voltage domains in the isolator internal to the isolation package

    From which certification/standard is this specification derived:

    Various standards define DTI. IEC 60747-17 which refers to IEC 60664 to define DTI (IEC 60664 is the Insulation coordination for equipment within low-voltage systems). Please see Distance Through Insulation: How Digital Isolators Meet Certification Requirement for details on each related specification.

    How it is specified in TI datasheets:

    How it is validated:

    Why it matters? Why would I need it? Why would a customer care about this spec?

     DTI is the thickness of insulation material and gives a good understanding of theoretical insulating capabilities.

     Some end equipment standards may specify a minimum distance through isolation value; however, provisions are included to allow an isolator to become certified if they can pass additional type tests. For additional information please see the related app note Distance Through Insulation: How Digital Isolators Meet Certification Requirement.