The STMicroelectronics SM30T33CAY is a 3000 W bidirectional TVS diode from the TRANSIL™ series, qualified to AEC-Q101 for automotive applications. It clamps transients at 45.4 V maximum while carrying a 66.1 A peak pulse current (10/1000 µs waveform). The 28 V reverse standoff voltage suits 24 V automotive rails or 28 V DC buses that need protection against load-dump and inductive kickback. The single bidirectional channel handles both polarities, so a single device protects a signal line or power rail without needing two unidirectional parts in anti-series.
Automotive grade and temperature range
AEC-Q101 qualification means this part has passed the automotive stress tests: high-temperature reverse bias, temperature cycling, and humidity.
Sourcing and lifecycle posture
The base product number SM30T33 covers the family; the CAY suffix denotes the bidirectional, AEC-Q101 qualified variant in the SMC package.