DO-214AB footprint and the 1500 W pulse it handles
The 1.5SMC27CA-Q: Bidirectional means a single device clamps both positive and negative transients relative to ground — useful on AC-coupled signal lines or power rails where the polarity of the surge is unknown. The single-channel construction protects one line per package.
Voltage ratings and what they mean for the rail you are protecting
The reverse standoff voltage is 23.1 V — the DC or peak-AC voltage the protected line can carry without the TVS conducting in standby. Breakdown occurs at a minimum of 25.7 V, and the clamping voltage at the 40.5 A peak pulse current is 37.5 V. The gap between standoff and clamp defines the voltage margin the downstream circuitry must survive.
AEC-Q101 qualification and where the part fits
The 1.5SMC27CA-Q belongs to the Automotive 1.5SMC-Q series and carries AEC-Q101 qualification — the automotive-grade stress test suite (temperature cycling, high-temperature reverse bias, ESD, and preconditioning). This makes it suitable for ECU, ADAS sensor, and body-control module designs that require PPAP-capable components. The product status is Active.