What the clamping voltage and peak pulse rating mean for your circuit
The 1.5SMCJ160C: The 160 V reverse standoff is the working voltage — the TVS sits idle below it and conducts only when the transient pushes the line above 178 V breakdown. 1.5 kW peak pulse rating means the part survives a single-event transient within the 10/1000 µs window — the 287 V clamp at 5.2 A is the active protection ceiling, not an absolute maximum that can be held indefinitely. The downstream IC sees whatever the clamping characteristic allows at the incident energy level, so matching the standoff to the normal bus voltage and the clamp to the IC's absolute-max rating is the sizing decision. Bidirectional is listed as 1 channel — this is a unidirectional TVS, so it protects a single polarity. The Zener-type breakdown clamps the positive transients; a negative-going event sees the diode forward-conducting at approximately -0.7 V, which is adequate for most negative surge events on a positive-polarity rail.
DO-214AB (SMC) package and what it demands of the board
The SMC body is a standard DO-214AB — the cathode bar in the middle of the package identifies the polarity stripe, and the wide metal pad on the bottom must be soldered to a pad sized for the transient thermal impedance, not just the steady-state current. At 5.2 A peak the thermal moment is short, but if the pad is undersized the joint can crack on thermal cycling even though the average dissipation is low. Operating junction temperature is rated to 150°C with a -50°C lower limit. The 150°C ceiling is the junction, not the board ambient — on a populated board with limited airflow the designer must verify the steady-state thermal budget keeps the junction below that limit under fault-free conditions so the transient headroom is available when needed.