What the 120V standoff and 1.5kW rating mean for the protection circuit
The 1.5SMCJ120CA is a bidirectional Zener-based TVS diode — the 'CA' suffix confirms it clamps both polarities, which matters for AC rails and any line where the protected node can swing negative during a transient event. No power-line protection flag means this part is not UL recognized as a dedicated mains-protection device; for a 120 V AC line, confirm the applicable standard and whether the part meets the required creepage and clearance before specifying it in a mains-referenced position.
DO-214AB package and what the datasheet confirms about board assembly
SMC (DO-214AB) is the mid-size surface-mount TVS package — smaller than the P600 axial but larger than the SMA/SMB footprint, which puts it in the sweet spot for 1.5–3 kW TVS diodes where thermal pad area drives the clamping performance. The strip packaging listing tells you it ships as cut tape or ammpack orientation; reel quantity and exact lead-free/RoHS plating finish are confirmed from the published datasheet rather than inferred. Solder joint reliability on the SMC is well-characterized in the IPC/JEDEC standards — a standard lead-free reflow profile lands the cathode band orientation correctly, and the flat back body sits flush against the PCB plane with adequate paste coverage under the die attach pad.