Clamp ratings and what they mean for the board
The 1.5SMC82C: The reverse standoff of 70.1 V defines the working voltage the protected node sees in normal operation — the TVS stays inactive and presents only its leakage below this level. The 13.5 A peak pulse rating at the 10/1000 µs wave shape is the current the clamp can absorb under that specific IEC 61000-4-5 surge condition without degradation — a longer or wider pulse pushes the device toward its 1.5 kW peak-pulse power limit, so the waveform shape matters as much as the current number when sizing the clamp to a real surge environment.
Where the 1.5SMC family fits
The 1.5SMC series is Littelfuse's 1500 W bidirectional TVS family housed in the DO-214AB (SMCJ) package. This part is a Zener-type clamp — not a power-line protection TVS — so it protects local node-by-node bus or I/O lines from transient surges rather than the main rail entry.
DO-214AB SMC package — surface-mount fit
The DO-214AB (SMCJ) body mounts to a standard SMD pad array — the supplier device package designation SMCJ confirms the industry-standard footprint compatible with the wider SMC pinout. The Tape & Reel delivery format suits automated pick-and-place in volume assembly. Junction temperature is rated to 150 °C; the PCB pad design and any thermal vias under the cathode tab directly affect the actual TJ under clamping events, so the layout thermal path is part of the clamp design, not an afterthought.