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STMicroelectronics SM15T22CAY — Circuit Protection
STMicroelectronics

STMicroelectronics SM15T22CAY TVS Diode, 1500W

MPNSM15T22CAY
Active

STMicroelectronics SM15T22CAY TRANSIL™ bidirectional Zener TVS diode, AEC-Q101 qualified, 1500W peak pulse power, 18.8V reverse standoff, 39.3V clamping, DO-214AB SMC package, -40°C to 150°C junction temperature.

$1.0600Ref. price · indicative, final on quote
SM15T22CAY datasheet
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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.
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Specifications

SM15T22CAY Technical Specifications
ParameterValue
TypeZener
SeriesAutomotive, AEC-Q101, SM15TY, TRANSIL™
Mounting typeSurface Mount
Voltage - breakdown20.9V
Voltage - clamping (Max) @ ipp39.3V
Voltage - reverse standoff18.8V
Current - peak pulse (10/1000μs)254A (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
Bidirectional channels1

Product details

1500W bidirectional TVS for 12V/24V automotive buses

The SM15T22CAY is a bidirectional Zener TVS diode from STMicroelectronics' TRANSIL™ SM15TY series, qualified to AEC-Q101 for automotive applications. It delivers 1500W peak pulse power (10/1000µs) and is rated for 254A peak pulse current under the 8/20µs waveform. The 18.8V reverse standoff voltage sits across a 12V or 24V DC bus without conducting, clamping transients at 39.3V maximum.

The 18.8V reverse standoff voltage (V_RWM) is the maximum DC voltage the TVS can block without conducting leakage current. On a nominal 12V automotive bus (which can spike to 14.5V during alternator charging), this provides headroom. When a surge hits, the device clamps at 39.3V maximum — that is the voltage the downstream electronics must survive. A 40V-rated capacitor or transceiver on the same rail sees a safe margin. The 1500W peak pulse power rating (10/1000µs waveform) covers load-dump events per ISO 7637-2 pulse 5, typical for automotive ECU power inputs.

AEC-Q101 is the automotive discrete-component qualification standard. It mandates stress tests — HBM ESD, temperature cycling, high-temperature reverse bias — that industrial-grade TVS parts skip. The SM15T22CAY carries that certification, which means it can be specified in a Tier-1 PPAP submission without a waiver. The lifecycle status is Active, and the base product number is SM15T22.

Frequently asked questions

Is SM15T22CAY AEC-Q101 qualified?

Yes, the SM15T22CAY is AEC-Q101 qualified, part of the Automotive SM15TY series from STMicroelectronics. This qualification covers stress testing per the automotive discrete standard, making it suitable for PPAP submissions in automotive ECUs.

What is the difference between SM15T22CAY and SM15T22A?

The SM15T22CAY is a bidirectional TVS diode, while the SM15T22A is the unidirectional version. Both share the same 1500W peak pulse power, 18.8V standoff, and 39.3V clamping voltage, but the bidirectional variant protects against both positive and negative transients — useful for AC-coupled lines or bipolar supplies. The 'Y' suffix on SM15T22CAY denotes AEC-Q101 qualification.

Where can I buy SM15T22CAY available via RFQ confirmation?

The SM15T22CAY is available to order through independent distribution.

Is SM15T22CAY RoHS compliant?

The SM15T22CAY is listed as RoHS compliant per STMicroelectronics standard product compliance. The 'Y' suffix indicates AEC-Q101 qualification, and the part is also halogen-free per ST's green packaging policy.