What the 1.5SMCJ33CA is and what the ratings mean
The 1.5SMCJ33CA_R1_00001: This is a unidirectional Zener-based TVS (Transient Voltage Suppressor) in the standard SMC (DO-214AB) package — the 1500W footprint used across the industry for board-level transient protection. The CA suffix marks it as bidirectional, so it clamps both positive and negative overvoltage events without a second part. The 33V reverse standoff is the working voltage the diode tolerates continuously without conduction. The 36.7V minimum breakdown marks where it begins conducting during a transient. 1500W peak pulse power is the transient energy rating for this waveform class. The 28.1A peak pulse current is what the diode sinks at that clamping level — the two specs are linked by the clamping voltage, and both must fall within the device's peak-pulse rating curve.
What this part does not cover
Listed as general-purpose with no power-line protection rating — do not specify this for primary AC mains protection without a full fault-current and clearing-time analysis against the applicable standard. It is sized for secondary protection on low-voltage rails, signal lines, and local bus nodes, not for direct AC line-to-neutral clamping at the service entrance.