3 kW bidirectional TVS for automotive transient protection
The STMicroelectronics SM30T23CAY is a bidirectional Zener TVS diode from the TRANSIL™ SM30TY series, AEC-Q101 qualified for automotive applications. It delivers 3000 W (3 kW) peak pulse power per the 10/1000 µs waveform, clamping transients at 32.4 V maximum from a 20 V reverse standoff. The single bidirectional channel in a DO-214AB (SMC) surface-mount package suits it for protecting 12 V and 24 V automotive power rails, ECU inputs, and sensor lines against load-dump, inductive kickback, and ESD events across a -55°C to 175°C junction temperature range.
The 92.6 A peak pulse current rating (10/1000 µs) paired with the 3 kW power rating tells you this part can absorb substantial surge energy without failing short. For a 20 V standoff rail, the 32.4 V clamping voltage leaves a 12.4 V headroom margin above the nominal bus — enough to keep downstream 36 V-rated components safe during a load-dump event. The bidirectional structure means polarity doesn't matter during assembly, which simplifies pick-and-place and reduces orientation errors on high-volume automotive boards.
Active lifecycle, AEC-Q101 traceability
The AEC-Q101 qualification means each device has passed automotive-grade stress tests (HBM ESD, temperature cycling, high-temperature reverse bias) and is manufactured in an IATF 16949-certified line.
Sourcing and fit for the BOM
This is the exact ordering code for the bidirectional, AEC-Q101 qualified variant in the SM30TY family. The base product number SM30T23 covers multiple polarity and qualification options — confirm the suffix CAY (bidirectional, automotive) matches your BOM line.