3000 W peak pulse power for 15 V rails
The STMicroelectronics SM30T18CAY is a bidirectional TRANSIL™ TVS diode from the SM30TY series, rated for automotive applications and qualified to AEC-Q101. It delivers 3000 W of peak pulse power (10/1000 µs waveform) with a reverse standoff voltage of 15 V and a clamping voltage of 24.4 V at the rated peak pulse current of 123 A. This part is designed to protect 12 V and 15 V DC power rails and signal lines in automotive electronic control units, battery management systems, and sensor modules where transient overvoltage events from load dump, inductive kickback, or ESD must be clamped within the semiconductor breakdown limits of downstream components.
AEC-Q101 qualification and temperature range
This temperature grade also suits industrial applications with high thermal stress, such as motor drives and outdoor telecom power supplies.
Bidirectional clamping in a single SMC package
This is a single-channel bidirectional device, so it clamps symmetrically on both positive and negative transients — useful for AC-coupled signal lines or bipolar supplies where polarity is not fixed. The DO-214AB (SMC) package is a surface-mount footprint common for 3000 W TVS diodes, with a body size that suits automated assembly and reflow soldering.
Active production — no LTB concern
For dual-sourcing or supply resilience, the base product number SM30T18 covers unidirectional and bidirectional variants across the SM30TY series — confirm the exact ordering code suffix for your BOM line.