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STMicroelectronics SM30T15AY — Circuit Protection

SM30T15AY TVS Diode, 3000W, AEC-Q101, DO-214AB (SMC)

MPNSM30T15AY
Active

STMicroelectronics SM30T15AY automotive Zener TVS diode, 3000W peak pulse power, 13V reverse standoff, 14.3V breakdown, 21.5V clamping, 140A peak pulse current, unidirectional, DO-214AB (SMC), AEC-Q101 qualified, -55°C to 175°C.

$1.3500Ref. price · indicative, final on quote
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

SM30T15AY specifications
ParameterValue
TypeZener
Series*
MountingSurface Mount
Voltage - breakdown14.3V
Voltage - clamping (Max) @ ipp21.5V
Voltage - reverse standoff13V
Current - peak pulse (10/1000μs)140A
Power - peak pulse3000W (3kW)
Power line protectionNo
Operating temperature-55°C ~ 175°C (TJ)
GradeAutomotive
PackageTape & Reel (TR) Cut Tape (CT)
QualificationAEC-Q101
CaseDO-214AB, SMC
Unidirectional channels1

Product details

Automotive-grade transient suppressor for 12V and 24V rails

The 13V reverse standoff voltage suits 12V nominal rails, while the 21.5V clamping point limits the spike seen by downstream electronics. AEC-Q101 qualification confirms it meets the stress and reliability requirements for under-hood and chassis-mounted applications.

The 3000W peak pulse rating (10/1000µs) is the headline surge capacity. For a 24V automotive system, the 13V standoff is too low — that rail needs a higher voltage device. On a 12V bus, the 140A peak pulse current gives substantial headroom for protecting ECUs, sensors, and infotainment modules against ISO 7637-2 pulses.

Active production with AEC-Q101 traceability

The AEC-Q101 qualification provides the lot-level traceability and stress-test documentation that automotive Tier-1 and OEM buyers require for PPAP submissions. The base product number SM30T15 covers a family of voltage variants in the same package, simplifying BOM consolidation across multiple rail voltages.

Frequently asked questions

Is SM30T15AY RoHS compliant and AEC-Q101 qualified?

Yes, the SM30T15AY is AEC-Q101 qualified, meeting automotive stress and reliability standards. RoHS compliance is standard for current-production STMicroelectronics parts in this series.

Can SM30T15AY be used for 24V automotive systems?

No — the 13V reverse standoff voltage is intended for 12V nominal rails. For a 24V system (typical in trucks and heavy equipment), select a TVS with a standoff voltage above 24V, such as a higher-voltage variant in the SM30T family.

What is the difference between SM30T15AY and SMCJ30A?

Both are 3000W TVS diodes in the DO-214AB package, but the SM30T15AY is AEC-Q101 qualified for automotive use, while the SMCJ30A is a general-purpose commercial-grade part. The SM30T15AY also has a 13V standoff versus the SMCJ30A's 30V standoff — they protect different rail voltages.