The SMBJ36CA-13: Its 40 V minimum breakdown voltage means it stays out of the way during normal operation and starts conducting only when the line exceeds that threshold. The single bidirectional channel handles both positive and negative transients on the same line, saving a diode pair and board space.
The DO-214AA (SMB) surface-mount package reflows with standard lead-free profiles and mates with the common SMB footprint used across the TVS industry. The datasheet marks this part as 'No' for power line protection — it is intended for signal lines, DC power inputs, or low-impedance transient paths, not for direct mains or high-energy surge applications that would exceed the 600 W peak pulse capability on a repetitive basis.