What the clamping specs mean for the board
The SMBJ8.0CA-13: The 8.89 V minimum breakdown voltage gives a guard band above the 8 V reverse standoff — the part stays off during normal operation and only conducts when the transient pushes past that threshold. No power line protection here (it's not designed for that job), but for general-purpose signal and low-voltage rail clamping it fits the standard TVS role.
Package and rework — DO-214AA SMB
DO-214AA (SMB) is a two-lead surface-mount package with the cathode band on one end — the bidirectional version has no polarity, so orientation is non-critical, but the band still marks the reference. The SMB footprint is larger than the SMA sibling, which helps with manual rework: the pads give enough room for a hot-air nozzle to heat both terminals evenly without scorching the board. The 600 W pulse rating is specified at 25°C; at 150°C junction the peak pulse power derates to roughly 300 W, so factor that in if the ambient runs hot near the rail.
It is available in Tape & Reel (TR) and Cut Tape (CT) options, which covers both reel-fed assembly and prototype or repair quantities. No pin-compatible second source is recorded in the SMBJ series, but the DO-214AA footprint is widely used across TVS families — a parametric cross-check at RFQ can identify drop-in alternatives if dual sourcing is needed.