The 1.5SMC160CA-M3/9AT: That 1.5 kW rating means it can clamp a 6.8 A surge (the Ipp at that waveform) without exceeding the junction temperature limit — a common benchmark for protecting DC power rails, signal lines, and I/O ports in industrial and telecom equipment against lightning-induced transients or inductive load dumps. The reverse standoff voltage of 136 V sets the maximum continuous DC voltage the device can sit across without conducting leakage current.
Bidirectional clamping — one device covers both polarities
With a single bidirectional channel, this TVS clamps transients of either polarity symmetrically. That is useful on AC signal lines, bipolar power buses, or any pair where the surge can swing positive or negative relative to ground — one DO-214AB package replaces two unidirectional diodes wired back-to-back. The DO-214AB (SMC) surface-mount package, also designated SMCJ, is a standard footprint for high-power TVS diodes.