The 1.5KE15AHE3_A/D: A 12V-rated ECU input stage with a 30V abs-max rating has margin here. The minimum breakdown voltage is 14.3V, so the TVS starts conducting at roughly 14V — well above the 12.8V standoff, ensuring no leakage at normal battery voltage.
Package, mounting, and storage
Through-hole DO-201AA axial package (also known as DO-27) — the leads are formed for through-hole PCB insertion or point-to-point wiring. Tape and box packaging suits hand-insertion or low-volume automated assembly; store the reels dry, though the package is not moisture-sensitive like a plastic SMD part.