Automotive-grade 1500 W TVS in DO-214AA
The Bourns 1.5SMBJ33A-H is a Zener unidirectional TVS diode in the 1.5SMBJ series, designed to clamp transients on 33 V nominal rails. The AEC-Q101 qualification is the hard gate for automotive deployment — this part carries the full PPAP documentation an OEM auditor expects for underhood or cabin electronics. The -55°C to 150°C junction temperature range covers the engine-bay thermal profile with margin.
Clamp voltage and rail protection
With a 33 V reverse standoff voltage, the diode does not conduct below the nominal rail, so it adds no leakage on a 24 V or 28 V bus. Breakdown is guaranteed at 36.7 V minimum, and the clamp holds at 53.3 V maximum while shunting 28.2 A peak pulse current.
Listed as Active on the manufacturer's lifecycle record. This is a current-production Bourns part with no planned obsolescence notice. The base product number 1.5SMBJ spans a full voltage range, so the 33A variant is a standard catalog item.