What is Distance Through Isolation (DTI)?
Please note that all definitions and references are based on the latest standard IEC 60747-17
Definition:
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.
