Answer: ISO 16750 is a standard which provides guidance regarding environmental conditions commonly encountered by electrical and electronic systems installed in automobiles.
The AEC-Q100 is defined by the Automotive Electronics Council as a “Stress Test for Qualification for Integrated Circuits.”
In my understanding, the main difference is “environmental conditions” vs. “Stress Test”.
These 2 standards are the most common for automotive qualification.
You can find more information about the standards from the links below.
en.wikipedia.org/wiki/ISO_16750
en.wikipedia.org/wiki/Automotive … cs_Council
aecouncil.com/AECDocuments.html