6 Conclusion

Even though many international standards specify DTI requirements based on optocoupler and other legacy isolators, these standards have alternate clauses that allow the use of digital isolators with much thinner DTI to pass stringent test criteria based on thermal cycling and humidity tests followed by very high dielectric withstand voltages. Texas Instruments’ digital isolators are fully certified by multiple safety agencies, such as VDE, CSA, TUV, CQC, etc., with basic and reinforced ratings. For a complete list of certified isolators from Texas Instruments, see Digital Isolators – Certificates. In summary, thicker DTI is not a prerequisite for digital isolators in safety-critical applications. When it comes to high voltage insulation in safety-critical applications, quality of insulation is as important, if not more, than quantity.