45V standoff and clamping performance
The 1.5SMCJ45CA-AQ: The 45V reverse standoff is the working voltage at which the diode presents a high-impedance off-state — the circuit runs below this without the TVS conducting. That ratio is what tells you whether your downstream IC survives the worst-case spike in a 12V automotive system. The 20.6A peak pulse current is the rating at that waveform; shorter-higher-current transients (8/20µs) would clamp at a lower voltage but consume more of the diode's energy-absorption budget.
Automotive temperature grade and protection topology
Junction temperature rating of 150°C means the die is rated for the upper band of automotive thermal profiles. Bidirectional, single-channel construction means the diode is polarity-agnostic — it clamps both positive and negative transients. This suits floating rails, AC signal lines, or any node where the transient polarity is undefined. If you need unidirectional protection on a known-polarity rail, the standoff voltage still applies but the clamping symmetry does not.
DO-214AB SMC package and strip packaging
The DO-214AB (SMC) package is the standard outline for 1.5kW TVS diodes — the cathode bar marks polarity on unidirectional variants; on this bidirectional part the polarity marking is less critical but the bar still indicates the die position. The supplier device package field confirms the same footprint (SMC/DO-214AB) for pad and paste mask compatibility. Listed as strip packaging — meaning cut-tape per unit, not reel. Confirm your pick-and-place system accepts cut-tape or whether you need a reel-sourced variant from the same manufacturer. The strip format is typical for lower-volume automotive assembly or service-replacement procurement.