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STMicroelectronics SM4T7V6AY — Circuit Protection

SM4T7V6AY STMicroelectronics Automotive TVS Diode, 400W

MPNSM4T7V6AY
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STMicroelectronics SM4T7V6AY, Automotive AEC-Q101 SM4TY TRANSIL™ TVS diode, 400W peak pulse power, 6.5V standoff, 14.5V clamp, unidirectional, DO-214AC SMA, -55 to 150°C.

$0.2053Ref. price · indicative, final on quote
STMicroelectronics SM4T7V6AY datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

SM4T7V6AY specifications
ParameterValue
TypeZener
SeriesAutomotive, AEC-Q101, SM4TY, TRANSIL™
MountingSurface Mount
Voltage - breakdown7.2V
Voltage - clamping (Max) @ ipp14.5V
Voltage - reverse standoff6.5V
Current - peak pulse (10/1000μs)160A (8/20µs)
Power - peak pulse400W
Power line protectionNo
Operating temperature-55°C~150°C(TJ)
PackageTape & Reel (TR); Cut Tape (CT)
ApplicationsAutomotive
CaseDO-214AC, SMA
Unidirectional channels1

Product details

The STMicroelectronics SM4T7V6AY is a unidirectional TRANSIL™ TVS diode from the automotive-grade SM4TY series, rated for 400W peak pulse power (10/1000µs waveform) and AEC-Q101 qualified. It clamps transients on a 6.5V nominal rail (reverse standoff) with a breakdown minimum of 7.2V and a maximum clamping voltage of 14.5V at the rated peak pulse current of 160A (8/20µs).

Voltage thresholds and protection margin

The 6.5V standoff voltage means the diode is effectively an open circuit below that level, drawing negligible leakage. Breakdown starts at 7.2V minimum, so a 5V or 3.3V logic rail is safe — the diode only conducts when a transient pushes the line above 7.2V.

The DO-214AC (SMA) package is a two-lead SOD-123-like body with a visible cathode band; it reflows cleanly with a standard lead-free profile and is easy to hand-replace with hot air if a board comes back for rework.

Frequently asked questions

What is the peak pulse power of SM4T7V6AY?

The SM4T7V6AY is rated for 400W peak pulse power on a 10/1000µs waveform, which is the standard TVS rating for protecting automotive 6.5V rails against load-dump and inductive-load transients.

Is SM4T7V6AY a replacement for SM4T7V5A?

The SM4T7V6AY is a different voltage variant within the same SM4T family. The SM4T7V5A has a lower standoff voltage (5V) and breakdown threshold; verify the rail voltage of your design before substituting — the 6.5V standoff of the V6AY may not trigger on a 5V rail that needs a lower clamp.

Does SM4T7V6AY have AEC-Q101 qualification?

Yes, the SM4T7V6AY is AEC-Q101 qualified as part of the Automotive SM4TY series, making it suitable for automotive-grade designs requiring documented reliability.

Is SM4T7V6AY unidirectional or bidirectional?

The SM4T7V6AY is a unidirectional TVS diode with one anode and one cathode — it protects against positive transients only. For bidirectional protection on AC or bipolar signal lines, a different part in the SM4T family would be needed.