Clamping and peak pulse ratings
The 1.5SMCJ11AS_R1_00001: Reverse standoff sits at 11 V typical, so the diode stays off the bus during normal operation and breaks down above 12.2 V minimum to absorb the surge before the clamp fires — the window between standoff and clamping is tight enough to protect a 12 V nominal rail without false triggering. 1500 W peak pulse rating at the 10/1000 µs wave shape is the standard TVS stress reference — the device handles short-duration transients well above its continuous dissipation, which is not listed because this is a protection part, not a regulator.
Operating temperature and thermal margin
TJ max of 150 °C gives real thermal headroom for a protection diode that dissipates only during events — in most designs the junction spends the vast majority of its life below ambient, so the 150 °C ceiling is conservative by design rather than a constraint.
Package and board footprint
DO-214AB SMC is the industry-standard large-current TVS package — the wide metal tab on the cathode carries heat away from the junction and provides a natural thermal pad for the SMT reflow profile. Available in tape-and-reel or cut-tape packaging to suit either production run or prototype quantities. Unidirectional single-channel topology — one polarity only, so confirm the protected node never sees reverse polarity in the application. For bidirectional protection across an AC signal line a different polarity variant from the same 1.5SMC base family would be needed.