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A space grade comparator (LM139AQML-SP) and a space grade qualified reference (TL1431-SP or the LM4050QML-SP) could be used. We are considering developing a space grade integrated solution like some of our commercial ones.
The datasheet contains power supply sequence section.
It is on page 26 of the -SP datasheet.
Just for clarification, you are looking for Space grade version. I believe this was mentioned in the duplicate post that was deleted. Please correct me if you are not looking for the -SP part.