SBC: Defect when CANH connected to 24V, CANL to ground?
The maximum CAN differential voltage specification comes from the official ISO specification ISO11898-2:2016. This must be considered to ensure a proper CAN communication. There will be no destruction if these limits (-5V/+10V) are exceeded. However, the SBC cannot be used in automotive 24V systems without addititional protection, because you have normally the load dump requirements that you need to survive up to 60V. Industrial 24V applications are fine as long as the absolute maximum ratings are ensured.