Thanks for Posting your question into forum. The failure rate of our TopSwitch Parts are very very low, the product has been in the market for almost 20 years.
Please let us know if this doesn't help.
Regards,
PI-KSAN

Is there an official statement to back this FIT value up ?
I am currently performing an EN61508 assessment and
have to use old public domain documents to assess the FIT for each component.
These older documents often have FIT values that are much higher than would be reasonably expected.

please email when this is commented on

Hi robin48gx and markus271286,

For specific product FIT rates, please send your inquiries to cim@power.com, and they can help you.

-PI-ODO