What the clamping ratings mean for your protection window
The 1.5SMCJ90CA: The 90V reverse-standoff voltage is where the diode stays off during normal rail operation — it must sit above the operating voltage with enough margin that no leakage-path conduction occurs at the rated ambient.
DO-214AB SMC package for surface-mount assembly
The DO-214AB (SMC) is the standard large-footprint TVS body — the wide solder-pad lands on the cathode bar accept a healthy thermal via array under the tab for board-level heat spreading during clamping events. Strip packaging is the standard tray orientation for this body size; it is compatible with standard pick-and-place tooling and reflow profiles for lead-free assembly.