The 1.5SMC30CAHM3/H: That clamp voltage is the voltage the protected circuit sees during the surge — a 24 V nominal rail with a 30 V abs-max input stays inside its safe operating area with this part.
AEC-Q101 qualification means this part ships with automotive PPAP documentation on request — a requirement for Tier-1 and OEM production lines that need traceable lot-level data.
