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TPS1641: Low conf level in MTBF estimation and power security during fail

Part Number: TPS1641


My first question regards the expected lifetime of TPS1641. I could not find any MTBF number in the datasheet. Has there been any lifetime evaluation of this eFuse? I have used your estimation tool, but I am not sure if the result is enough trustworthy. The results was MTBF 1 million years and a conf level on 60%. Since the confidence level indicates the level of certainty or reliability of the estimation, a high confidence level is desirable. Unfortunately I think 60% is too low value to secure the result. Is there any way to decrease MTBF estimation in order to increase the confidence level? I would be more interested to know if the eFuse for example had a MTBF on 100 years with 98% conf level, instead of 1 million years. I believe +90% confidence level is acceptable to consider the estimation to be trustworthy.

My second question is about security. What happens within the eFuse if it fails/stops working. We will use this eFuse to protect a circuit for a certain power and voltage level. Will the eFuse still block current passing through the eFuse even though it has failed? I want to guarantee that no harmful power/current can pass through the eFuse if it fails I want to know how we can see if the eFuse has failed or not.

Thanks in advice for your support!

Kind regards,