TVS diode for 48V and 60V automotive rails
Rated at a peak pulse power of 400W (10/1000µs waveform), it holds off a 70V reverse standoff voltage and clamps a surge to 146V maximum at the rated peak pulse current of 16A (8/20µs waveform). This part is AEC-Q101 qualified, making it a documented choice for production programs that must submit PPAP evidence to an OEM auditor.
What the protection window means for your rail
For a nominal 48V or 60V automotive bus — common in mild-hybrid or 48V starter-generator systems — the 70V standoff provides enough headroom above the regulated rail to avoid nuisance triggering during normal load transients, while the 146V clamp keeps the downstream electronics below their absolute maximum rating. The 400W peak pulse power rating at the 10/1000µs waveform confirms it can handle the energy of a load-dump or inductive kick without exceeding junction temperature limits.
AEC-Q101 — not just automotive-friendly
The SM4T82AY carries an AEC-Q101 qualification, which is the discrete-semiconductor equivalent of AEC-Q100 for ICs.
The SM4T82AY is supplied in the standard DO-214AC (SMA) surface-mount package. This is a common footprint shared across the SM4TY family and many other SMA-packaged TVS diodes, so a board layout designed for one SMA TVS will accept this part without a pad revision. The package supports automated pick-and-place assembly and reflow soldering. For a production buyer, the SMA package means the part can be sourced from multiple suppliers without a PCB change, reducing single-source risk on the BOM.