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STMicroelectronics SM4T26CAY — Circuit Protection

STMicroelectronics SM4T26CAY Zener TVS, 400W, AEC-Q101, SMA

MPNSM4T26CAY
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STMicroelectronics SM4T26CAY, Automotive Zener TVS Diode, Bidirectional, 22V Reverse Standoff, 24.4V Breakdown, 48.3V Clamp, 400W Peak Pulse, DO-214AC (SMA), AEC-Q101 Qualified.

$0.9300Ref. price · indicative, final on quote
STMicroelectronics SM4T26CAY datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

SM4T26CAY specifications
ParameterValue
TypeZener
Series*
MountingSurface Mount
Voltage - breakdown24.4V
Voltage - clamping (Max) @ ipp48.3V
Voltage - reverse standoff22V
Current - peak pulse (10/1000μs)48A (8/20µs)
Power - peak pulse400W
Power line protectionNo
Operating temperature-55°C ~ 150°C (TJ)
GradeAutomotive
PackageTape & Reel (TR) Cut Tape (CT)
QualificationAEC-Q101
CaseDO-214AC, SMA
Bidirectional channels1

Product details

Automotive-grade Zener TVS for 24V rail clamping

It is AEC-Q101 qualified, making it suitable for automotive electronics, industrial controls, and any 24V nominal rail that needs protection against load-dump or surge events. The device clamps at 48.3V maximum with a peak pulse current capacity of 48A (8/20 µs).

Voltage window and clamping performance

Reverse standoff voltage is 22V, so the diode stays off below that level. Breakdown occurs at a minimum of 24.4V, and clamping is specified at 48.3V maximum under the peak pulse condition. This window suits protection of 24V power buses where the rail tolerance allows a 2.4V margin before the TVS starts conducting.

Housed in a standard DO-214AC (SMA) package, surface-mount, with the same footprint as other SMA Zener diodes.

Frequently asked questions

Is SM4T26CAY suitable for automotive applications?

Yes. The SM4T26CAY is AEC-Q101 qualified, making it suitable for automotive electronics requiring transient voltage suppression.

Is SM4T26CAY AEC-Q101 qualified?

Yes, it carries AEC-Q101 qualification.

What package is SM4T26CAY?

It is supplied in a DO-214AC (SMA) surface-mount package.