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STMicroelectronics SM4T15AY — Circuit Protection

STMicroelectronics SM4T15AY Zener TVS, AEC-Q101, 400W

MPNSM4T15AY
Active

STMicroelectronics SM4T15AY, Automotive AEC-Q101 Zener TVS, 400W Peak Pulse, 13V Reverse Standoff, 27.2V Clamp, 85A (8/20µs), DO-214AC SMA, Surface Mount.

$0.6800Ref. price · indicative, final on quote
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

SM4T15AY specifications
ParameterValue
TypeZener
SeriesAutomotive, AEC-Q101, SM4TY, TRANSIL™
MountingSurface Mount
Voltage - breakdown14.4V
Voltage - clamping (Max) @ ipp27.2V
Voltage - reverse standoff13V
Current - peak pulse (10/1000μs)85A (8/20µs)
Power - peak pulse400W
Power line protectionNo
Operating temperature-55°C~150°C(TJ)
PackageTape & Reel (TR); Cut Tape (CT)
ApplicationsAutomotive
CaseDO-214AC, SMA
Unidirectional channels1

Product details

What this Zener TVS protects and where

It clamps transients on a 13 V nominal rail, with a minimum breakdown voltage of 14.4 V and a maximum clamping voltage of 27.2 V at the rated peak pulse current. The 400 W peak pulse power rating (10/1000 µs waveform) and 85 A peak pulse current capability (8/20 µs waveform) define the surge it can absorb without failing short. Packaged in a DO-214AC (SMA) surface-mount case, it is intended for overvoltage protection on automotive power lines, sensor inputs, and control module rails where AEC-Q101 screening is required.

AEC-Q101 and the operating temperature range

For a BOM destined for automotive or other high-reliability environments, the AEC-Q101 mark is the screening level that avoids the paperwork burden of an additional qualification run.

The DO-214AC (SMA) package is a standard surface-mount outline with a JEDEC-registered footprint. No exposed pad or thermal vias are required; the junction-to-ambient thermal path relies on the solder joint and PCB copper area.

Frequently asked questions

Is SM4T15AY unidirectional or bidirectional?

It is a unidirectional Zener TVS, with one protection channel. The cathode band on the package marks the side that connects to the protected rail; the anode connects to ground.

What is the difference between SM4T15AY and SM4T15?

The SM4T15AY is the AEC-Q101 automotive-qualified version of the base SM4T15. The electrical characteristics (breakdown, clamping, standoff voltages, peak pulse power) are identical. The 'Y' suffix adds the automotive-grade screening and traceability required for production parts in vehicle electronics.

Is SM4T15AY RoHS compliant?

The part is listed as a current-production automotive-grade device from STMicroelectronics, which typically ships RoHS-compliant and halogen-free. Confirm the specific date-code compliance certificate with the supplier at order time.