A&WST had an article about the criteria 'space hardened' electronic if I can remeber to look I'll post--but
CJ has given me alot to think about
The criteria are icnredibly strict, you can find them here:
ECSS-E-ST-40C - Software general requirements
ECSS-Q-ST-60C Rev.1 - Electrical, electronic and electromechanical (EEE) components
Although you have to log in to see them (registration is free).
Slightly more generalised versions are online here:
https://escies.org/ReadArticle?docId=167