33V rail protection — clamp voltage and surge rating
The SMBJ33CA-13: This bidirectional TVS clamps at 53.3V maximum when hit with an 11.3A peak pulse current (10/1000µs waveform), starting from a 33V reverse standoff voltage.
DO-214AA SMB — standard reflow footprint
The DO-214AA (SMB) surface-mount package is a common TVS footprint that reflows on the same profile as most passive and logic components. The -55°C to 150°C junction temperature range covers industrial enclosures and underhood automotive environments without derating at the high end. General-purpose application classification means it is not rated for power-line protection (no internal filter or crowbar), but it is a straightforward clamp for signal lines, DC power inputs, and low-voltage bus protection where the 33V standoff matches the rail voltage.