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STMicroelectronics SM6T18AY — Circuit Protection

STMicroelectronics SM6T18AY Zener, 600W, 15.3V, AEC-Q101

MPNSM6T18AY
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STMicroelectronics SM6T18AY, Automotive AEC-Q101 TRANSIL™ Zener, 600W peak pulse power, 15.3V reverse standoff, 32.5V clamping, DO-214AA SMB, surface mount.

$1.0500Ref. price · indicative, final on quote
STMicroelectronics SM6T18AY datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

SM6T18AY specifications
ParameterValue
TypeZener
SeriesAutomotive, AEC-Q101, SM6TY, TRANSIL™
MountingSurface Mount
Voltage - breakdown17.1V
Voltage - clamping (Max) @ ipp32.5V
Voltage - reverse standoff15.3V
Current - peak pulse (10/1000μs)123A (8/20µs)
Power - peak pulse600W
Power line protectionNo
Operating temperature-55°C~150°C(TJ)
PackageTape & Reel (TR); Cut Tape (CT)
ApplicationsAutomotive
CaseDO-214AA, SMB
Unidirectional channels1

Product details

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.

Frequently asked questions

Is SM6T18AY RoHS compliant?

The SM6T18AY is listed as RoHS compliant per the manufacturer's documentation.

Is SM6T18AY suitable for automotive applications?

Yes, it is part of the Automotive SM6TY series and is AEC-Q101 qualified, making it suitable for automotive environments including under-hood and engine bay locations.

Can SM6T18AY replace SM6T18A?

The SM6T18AY is the automotive-qualified (AEC-Q101) version of the SM6T18A. The electrical characteristics — breakdown voltage, standoff voltage, clamping voltage, and peak pulse power — are the same, so it is a drop-in replacement where automotive qualification is required.