AEC-Q101 qualified bidirectional TVS for 24V automotive rails
The 1.5SMC27CAHE3/9AT: It is purpose-built for automotive electronics, carrying AEC-Q101 qualification — the semiconductor-level reliability standard for automotive-grade discrete components. This means the device has passed rigorous temperature cycling, high-temperature reverse bias, and ESD sensitivity tests required for PPAP submission to OEMs. Rated for 1500 W peak pulse power dissipation (10/1000 µs waveform), the diode clamps transients at 37.5 V maximum while conducting 40 A peak pulse current. The reverse standoff voltage of 23.1 V makes it a natural fit for protecting 24 V nominal automotive power buses — the typical alternator and battery charging range — without clipping normal operating voltage.
Parametric envelope and board-fit
The minimum breakdown voltage is 25.7 V, providing a guard band above the 23.1 V standoff. This ensures the TVS remains non-conductive during steady-state operation and only activates when a transient exceeds the normal bus voltage. The single bidirectional channel protects both polarities of a signal pair or a power rail referenced to ground. The 'CA' suffix confirms bidirectional clamping; the 'HE3' designates the AEC-Q101 automotive qualification variant. The '/9AT' suffix specifies the Tape & Reel packaging format, which is the standard delivery for high-volume pick-and-place assembly.