What 1.5SMCJ130C does on a board
The 1.5 kW peak pulse rating is referenced to the 10/1000 µs waveformspec — this is the standard telecom/industrial transient shape used to rate board-level TVS clamps. The 231 V clamping ceiling is what the downstream semiconductor sees at the rated surge current; actual clamp voltage tracks lower at smaller surges.
Thermal and mounting details
Junction temperature is rated from -50 °C to 150 °C — this is the standard industrial Tj window, suitable for equipment that runs hot or sits outdoors without active cooling. The SMC (DO-214AB) package is the mid-size SMT footprint; the cathode bar on the body marks polarity — the banded (single-color) SMC marking indicates unidirectional polarity, not bidirectional. Confirm orientation against the layout silk or the diode schematic symbol before reflow.