3000W bidirectional TVS for 24V automotive rails
The STMicroelectronics SM30T28CAY is a bidirectional Zener-type TVS diode from the TRANSIL™ series, rated for 3000W peak pulse power (10/1000µs waveform) and qualified to AEC-Q101 for automotive applications. It protects a 24V nominal rail with a reverse standoff voltage of 24V, a minimum breakdown of 26.7V, and a maximum clamping voltage of 38.9V at the 77.1A peak pulse current. The single bidirectional channel makes it suitable for protecting AC-coupled or bipolar signal lines where polarity-independent clamping is required.
What the 3000W rating means for the BOM
The 3000W peak pulse power rating defines the energy-handling capability for a single 10/1000µs surge event. For a 24V system, this translates to a clamping voltage of 38.9V at the rated current, which keeps downstream components within their safe operating area during load-dump or inductive-load transients. The 77.1A peak pulse current gives a direct check against the expected surge current from the system's worst-case transient — if the calculated surge exceeds this figure, a higher-power device or external protection network is needed. The surface-mount assembly keeps the board compatible with reflow processes common in automotive ECU production.
Automotive qualification and temperature range
AEC-Q101 qualification means the SM30T28CAY has passed the stress tests required for automotive-grade discrete semiconductors, including high-temperature reverse bias, temperature cycling, and humidity testing. The -55°C low end also supports cold-crank and arctic-condition operation. The product status is listed as Active, indicating ongoing production with no announced end-of-life.