I have a question about ADuM140x datasheet.
Sorry for the old story, please advise.
Why ADI changed UL comments.
Historically, ADI’s digital isolators had received a Double protection rating under UL 1577, which includes a 20 kVpk discharge test. UL subsequently changed the testing methodology, after which our products would not pass. As a result, all products since then were classified as Single protection, and we updated the data sheets of products in the market at that time to reflect the lower rating. Unfortunately not all data sheets were updated at that time, including the ADuM140x. The UL certification documents on our web site were always accurate and correctly reflected the change from Double Protection to Single Protection.
Although no physical design, manufacturing or test changes were made to the device, ADI decided to provide a PCN to our customers.
The isolation voltage ratings for our devices were unaffected by the change in classification. A production line test at 120% of the isolation voltage for 1 second is required by UL 1577 for all devices. For example, a device rated at 2.5 kVrms has always been tested in production for 1 second at 3.0 kVrms in accordance with this requirement. Production line isolation voltage testing has not been changed.
Thank you for your reply.