43 V rail protection — the clamping voltage that matters
The SMBJ43CA-13-F: Its 69.4 V maximum clamping voltage at the 8.6 A peak pulse current (10/1000 µs waveform) is the actual stress the downstream silicon sees — a 24 V or 48 V bus powered through a 43 V-rated TVS means the protected device must survive that clamp ceiling, not just the standoff voltage.
600 W peak pulse — sizing the energy budget
The 47.8 V minimum breakdown voltage gives a guard band above the 43 V reverse standoff — the TVS stays transparent during normal operation and only conducts when the transient exceeds that threshold. The bidirectional single-channel configuration means it clamps both polarities equally — useful on AC signal lines or DC rails where reverse-voltage events are possible. The -55°C to 150°C junction temperature range covers outdoor telecom enclosures and under-hood automotive bays without derating the peak pulse capability at the cold end.
DO-214AA SMB — board-fit and procurement
Packaged in the DO-214AA (SMB) surface-mount footprint, the SMBJ43CA-13-F mates with standard SMB solder pads. The supplier device package is also SMB, so the land pattern is the same across the series. Tape & Reel and Cut Tape options let you order production reels or prototype quantities. Lifecycle status is Active — no NRND or EOL flag. The base product number SMBJ43 means the same die is available in unidirectional (SMBJ43A) if your design only needs single-polarity clamping.