Package and board-fit — DO-214AB (SMC)
The 1.5SMC480AHM3_B/H comes in the DO-214AB (SMC) package, surface-mount on a standard SMC footprint. The supplier device package is listed as DO-214AB (SMCJ), which shares the same JEDEC outline — the pad layout is identical between the two designators. A 2 oz copper pour on the top layer, tied through vias to an inner-plane ground, is the typical starting point for this power level.
Automotive qualification and temperature range
This part carries AEC-Q101 qualification, the automotive-grade stress and reliability standard for discrete semiconductors. The Automotive grade designation means the part has passed the full suite of AEC-Q101 tests including HTRB, H3TRB, and temperature cycling — no additional screening is needed for production release in an automotive ECU.
Clamping voltage and standoff — what the numbers mean
The reverse standoff voltage is 408V — this is the maximum DC or peak-AC voltage the TVS can sit across without conducting significant leakage. For a 400V nominal bus, the 408V standoff provides enough margin to ride through normal ripple and transients below the breakdown knee. The 658V clamp means downstream components must survive that peak voltage for the pulse duration — a 600V-rated MOSFET on the same rail would need a secondary clamp or derating.