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STMicroelectronics SM15T15AY — Circuit Protection

STMicroelectronics SM15T15AY TVS Diode, 1500W, AEC-Q101, SMC

MPNSM15T15AY
Active

STMicroelectronics SM15T15AY, Automotive Zener TVS, 1500W Peak Pulse, 12.8V Reverse Standoff, 27.2V Clamp, Unidirectional, SMC, AEC-Q101.

$1.0000Ref. price · indicative, final on quote
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

SM15T15AY specifications
ParameterValue
TypeZener
Series*
MountingSurface Mount
Voltage - breakdown14.3V
Voltage - clamping (Max) @ ipp27.2V
Voltage - reverse standoff12.8V
Current - peak pulse (10/1000μs)368A (8/20µs)
Power - peak pulse1500W (1.5kW)
Power line protectionNo
Operating temperature-40°C ~ 150°C (TJ)
GradeAutomotive
PackageTape & Reel (TR) Cut Tape (CT)
QualificationAEC-Q101
CaseDO-214AB, SMC
Unidirectional channels1

Product details

1500W automotive transient suppressor

It offers a 12.8V reverse standoff voltage, a minimum breakdown of 14.3V, and a maximum clamping voltage of 27.2V at the peak pulse current of 368A (8/20µs waveform).

Clamp voltage and rail protection

The 27.2V clamp voltage at 368A peak pulse current is the key parameter for verifying that downstream 40V-rated DC-DC converters or ASICs survive a load-dump event. With a 12.8V standoff, this part sits on a nominal 12V battery line without conducting leakage in normal operation. The 14.3V minimum breakdown provides a guard band against sustained overvoltage from an alternator regulator failure.

AEC-Q101 and the automotive BOM

This is the baseline for any Tier-1 or OEM BOM that requires PPAP-level documentation.

SMC package and board fit

Housed in the DO-214AB (SMC) package, this surface-mount TVS offers a compact footprint for automated assembly. The SMC body handles the 1500W pulse without requiring a heatsink, relying on the PCB copper pour for thermal dissipation. MSL rating should be verified from the label for bake requirements before reflow.

Frequently asked questions

Is the SM15T15AY suitable for automotive applications?

Yes. The SM15T15AY carries AEC-Q101 qualification and an automotive grade designation, making it suitable for under-hood and chassis-domain transient protection in 12V automotive systems.