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STMicroelectronics SM6T24AY — Circuit Protection

STMicroelectronics SM6T24AY TVS Diode, 600W, AEC-Q101

MPNSM6T24AY
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STMicroelectronics SM6T24AY, Automotive Grade Zener TVS Diode, 600W Peak Pulse Power, 20.5V Reverse Standoff, 42.8V Clamp, 1 Unidirectional Channel, DO-214AA (SMB), AEC-Q101 Qualified, -55°C to 150°C.

$1.0900Ref. price · indicative, final on quote
STMicroelectronics SM6T24AY datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

SM6T24AY specifications
ParameterValue
TypeZener
Series*
MountingSurface Mount
Voltage - breakdown22.8V
Voltage - clamping (Max) @ ipp42.8V
Voltage - reverse standoff20.5V
Current - peak pulse (10/1000μs)93A (8/20µs)
Power - peak pulse600W
Power line protectionNo
Operating temperature-55°C ~ 150°C (TJ)
GradeAutomotive
PackageTape & Reel (TR) Cut Tape (CT)
QualificationAEC-Q101
CaseDO-214AA, SMB
Unidirectional channels1

Product details

600W automotive TVS for 24V rail protection

The STMicroelectronics SM6T24AY is a unidirectional Zener TVS diode in the DO-214AA (SMB) surface-mount package, rated for 600W peak pulse power (10/1000µs waveform). It is designed to clamp transients on 24V nominal automotive power buses, with a 20.5V reverse standoff voltage and a maximum clamping voltage of 42.8V at the peak pulse current of 93A (8/20µs).

Clamping window and 24V bus margin

The 20.5V standoff voltage sits above the nominal 24V battery during steady-state operation, so the diode does not conduct during normal cranking or charging events. The minimum breakdown voltage of 22.8V provides a guard band before the device starts clamping. The 42.8V clamp limits the transient to a level that 60V-rated downstream components can survive, which is the typical derating practice for automotive 24V systems.

The mounting type is surface mount, compatible with standard reflow soldering profiles. The base product number is SM6T24, and the full order code SM6T24AY includes the automotive grade suffix.

Frequently asked questions

Is the SM6T24AY AEC-Q101 qualified?

Yes, the SM6T24AY is AEC-Q101 qualified, which means it has passed the automotive-grade stress tests for discrete semiconductors including HBM ESD, temperature cycling, and high-temperature reverse bias. This qualification is required for parts used in safety-critical or under-hood automotive applications.

What is the difference between SM6T24AY and SM6T24A?

The SM6T24AY is the automotive-grade (AEC-Q101 qualified) variant of the base SM6T24A part. The electrical specifications — 600W peak pulse power, 20.5V standoff, 42.8V clamp — are identical. The 'Y' suffix adds the AEC-Q101 screening and traceability required for automotive production BOMs. For non-automotive designs, the SM6T24A may be a cost-effective alternative, but the SM6T24AY should be used where AEC-Q101 compliance is specified.