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STMicroelectronics SM15T18AY — Circuit Protection
STMicroelectronics

STMicroelectronics SM15T18AY TVS Diode, 1.5 kW, AEC-Q101

MPNSM15T18AY
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STMicroelectronics SM15T18AY, Automotive AEC-Q101 TRANSIL™ TVS, 1500W peak pulse power, 15.3V standoff, 32.5V clamping, 1 channel unidirectional, DO-214AB SMC package.

$1.0600Ref. price · indicative, final on quote
SM15T18AY datasheet
StockContact for availability
MOQ1 pcs
  • 100% new & originalTraceable channels only — no refurbs, no pulls, no remarked parts.
  • Date & lot codes on quoteStated per line before you commit; label photos on request.
  • MSL-compliant ESD packingMoisture-sealed bags with indicator cards; reels photo-verified.
  • PayPal buyer protectionPay by T/T, PayPal or Payoneer — card payments covered end to end.

Specifications

SM15T18AY Technical Specifications
ParameterValue
TypeZener
SeriesAutomotive, AEC-Q101, SM15TY, TRANSIL™
Mounting typeSurface Mount
Voltage - breakdown17.1V
Voltage - clamping (Max) @ ipp32.5V
Voltage - reverse standoff15.3V
Current - peak pulse (10/1000μs)308A (8/20µs)
Power - peak pulse1500W (1.5kW)
Power line protectionNo
Operating temperature-40°C~150°C(TJ)
PackageTape & Reel (TR); Cut Tape (CT)
ApplicationsAutomotive
CaseDO-214AB, SMC
Unidirectional channels1

Product details

Automotive-grade 1.5 kW TVS for 12 V bus protection

The STMicroelectronics SM15T18AY is a 1500W unidirectional TVS diode from the AEC-Q101-qualified SM15TY TRANSIL™ series, designed for surge protection on automotive power and signal lines. With a 15.3 V reverse standoff voltage and a 32.5 V clamping point, it sits directly on 12 V battery rails, load-dump clamps, and ISO 7637-2 pulse suppressors.

Clamping window and surge rating

The 17.1 V minimum breakdown voltage gives a clean trigger point above the 15.3 V standoff, while the 32.5 V clamp keeps the protected rail inside the typical 36 V absolute-max of downstream ECUs and sensors. Peak pulse current is rated at 308 A for an 8/20 µs waveform — enough to handle the ISO 7637-2 pulse 5a load-dump energy in a 12 V system. Power line protection is not specified, so this part is intended for signal or secondary-side clamping rather than direct alternator-line suppression.

Frequently asked questions

Is the SM15T18AY AEC-Q101 qualified?

Yes, the SM15T18AY is part of the Automotive, AEC-Q101, SM15TY, TRANSIL™ series, which means it is qualified to the AEC-Q101 stress test standard for discrete semiconductors used in automotive applications.

Is the SM15T18AY RoHS compliant?

The SM15T18AY is listed with a Tape & Reel (TR) package option and is part of ST's standard product line; STMicroelectronics typically qualifies these devices as RoHS-compliant, though the specific compliance status should be verified against the latest datasheet or certificate of compliance.