Breakdown and standoff — where the protection window sits
The 1.5SMC220A-E3/9AT: The single unidirectional channel clamps one polarity — for AC or bidirectional rails, two devices back-to-back or a dedicated bidirectional TVS is needed.
DO-214AB SMC package — board-fit and sourcing
Supplied on Tape & Reel for automated pick-and-place; the base product number 1.5SMC220 is the family root, and the -/9AT suffix indicates the packaging and environmental grade.
