The applicable voltage differs for the following two possible cases.
(1) Case of voltage application through static electricity
(2) Case of repeated application of pulse voltage and DC
In this case as well, calculate the junction temperature under the actual usage conditions similarly to Q1, and check that the absolute maximum rating for the junction temperature (Tj) is not exceeded.
For the concept and junction temperature calculation method, refer to the following document provided on this website.
Precautions Regarding Use of NNCD Series and RD Series