[FAQ] ISO7740: Why are safety limiting values important?

Why are safety limiting values important?

Following the safety limiting values can help preserve the isolation barrier in the event one side of the isolator is damaged, such as a transient that lasts only a few microseconds. In this case, one die would be damaged, and the remaining die (and isolation barrier) are maintained.

However, secondary damage may occur to the device if the fault condition stays due to the die heating up past the maximum junction temperature (150degC). Performance of the isolation barrier cannot be guaranteed if the device exceeds 150degC.

Adhering to the safety-limiting values can prevent the device from heating up and help maintain the isolation .