SLLA563 June   2021 ISO1042 , ISO1042-Q1 , ISO1044 , ISO1050 , ISO1176 , ISO1176T , ISO1410 , ISO1412 , ISO1430 , ISO1432 , ISO1450 , ISO1452 , ISO15 , ISO1500 , ISO1540 , ISO1540-Q1 , ISO1541 , ISO1541-Q1 , ISO1640 , ISO1640-Q1 , ISO1641 , ISO3080 , ISO3082 , ISO3086 , ISO3086T , ISO3088 , ISO35 , ISO35T , ISO6720 , ISO6720-Q1 , ISO6721 , ISO6721-Q1 , ISO6731 , ISO6731-Q1 , ISO6740 , ISO6740-Q1 , ISO6741 , ISO6741-Q1 , ISO6742 , ISO6742-Q1 , 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 , ISO7820LL , ISO7821 , ISO7821LL , ISO7821LLS , ISO7830 , ISO7831 , ISO7840 , ISO7841 , ISO7842 , ISOW1044 , ISOW1412 , ISOW1432 , ISOW7740 , ISOW7741 , ISOW7742 , ISOW7743 , ISOW7744 , ISOW7821 , ISOW7840 , ISOW7841 , ISOW7841A-Q1 , ISOW7842 , ISOW7843 , ISOW7844

 

  1.   Trademarks
  2. 1Introduction
  3. 2Solid Insulation
  4. 3Why International Standards for High Voltage Components Have Minimum DTI Requirements
  5. 4Quality of Insulation Materials
  6. 5Various IEC Standards and their DTI Requirements
    1. 5.1 IEC 60747-17
    2. 5.2 UL 1577
    3. 5.3 IEC 62368-1
    4. 5.4 IEC 60601-1
    5. 5.5 IEC 61010-1
  7. 6Conclusion
  8. 7References

4 Quality of Insulation Materials

All insulators are not created equal. Quality of insulation depends on its dielectric strength. As Table 4-1 shows, air has a low dielectric strength and solid insulators such as epoxy, silica filled mold compound, polyimide and SiO2 have progressively higher dielectric strengths. SiO2 is an excellent insulator because, unlike polyimide and other polymer-based insulators, SiO2-based insulators do not degrade with exposure to ambient moisture. SiO2-based insulators tend to have very high working voltages for the lifetime of the components.

Table 4-1 Common Insulators Used for High-Voltage Isolation
Insulator Dielectric Strength
Air ~ 1 VRMS/µm
Epoxy ~ 20 VRMS/µm
Silica filled Mold Compound ~ 100 VRMS/µm
Polyimide ~ 300 VRMS/µm
SiO2 ~ 500 VRMS/µm