Broadcom : High voltage applications require high insulation ratings
Ensure Safe System Operation with Certified Isolation Devices: Alternative isolators based on monolithic IC fabrication processes, e.g. magnetic and capacitive isolators, are typically built using thin layers of insulation. Such isolators experience considerably higher electric field stress for the same working voltage when compared to that of optocouplers. Consequently, alternative isolators suffer from a multitude of additional aging mechanisms, which are active at relatively low continuous working voltages.