What the 14V standoff and clamping ratings mean
The 1.5SMCJ14AS_R1_00001: The 14V reverse standoff is the working voltage — the TVS stays off and draws only leakage current up to this level, presenting a high impedance to the protected line. That clamping ceiling, not the standoff, determines whether downstream silicon survives the event.
Peak pulse power and the 1500W rating
The 1.5 kW rating is the key differentiator from lower-power TVS families — it handles the larger energy dump from inductive kick, motor coil collapse, or ESD at system level, not just board-level whacks. The DO-214AB (SMC) package thermal impedance is sized for this power level; the cathode tab must mount to a solid copper pad on the PCB to realise the rated pulse capability.
Unidirectional Zener TVS — polarity and circuit context
This is a unidirectional clamp, so it protects against positive-going transients in one polarity only — it behaves as a forward-biased diode below ground in the reverse direction, passing through a typical 0.7 V forward drop. For bidirectional protection or AC lines the Panjit family offers the corresponding bidirectional variant. The part is classified for general-purpose applications per the evidence; it does not carry a power-line-protection certification, which would be required for direct AC-mains protection without an intermediate impedance.