400W peak pulse power in a DO-214AC footprint
The SMAJ200A-13-F: The reverse standoff voltage is 200V, meaning the diode stays out of the circuit during normal operation and only conducts when the line exceeds that level. This is a unidirectional device — one channel, cathode band marked. For bidirectional protection on the same rail, you would need two devices back-to-back or a different part number in the SMAJ family.
Board-level fit and temperature envelope
Housed in the standard DO-214AC (SMA) package, the same footprint used across the SMAJ series. The junction temperature range is -55°C to +150°C, covering industrial and most automotive under-hood environments — though this part carries no explicit AEC-Q101 grade in the record. The 400W peak pulse power rating at 10/1000µs is the energy-handling spec that determines whether the diode survives a given surge. For a 200V rail, the 324V clamp voltage means the TVS absorbs the transient energy until the upstream fuse or breaker clears — it is not a power-line protection device (the spec explicitly says Power Line Protection: No), so it belongs on signal or DC bus lines, not AC mains.