600W Zener clamp for 15 V rails
The STMicroelectronics SM6T18AY is a 600W peak pulse power Zener diode from the automotive-grade SM6TY TRANSIL™ series. It is designed to clamp transients on a 15.3 V reverse standoff rail, with a minimum breakdown voltage of 17.1 V and a maximum clamping voltage of 32.5 V at the peak pulse current.
Package and footprint for SMB (DO-214AA)
The SMB footprint is a common size for 600 W TVS diodes and matches the land pattern used by many other automotive transient suppressors in this power class.