Transient protection for 24V rails
The SMBJ24CA-13-F: The device is bidirectional, so it protects against both positive and negative transients on the same pair of terminals — common on AC-coupled signal lines or DC power inputs where reverse polarity is a risk.
Package and board integration
The SMB footprint is shared across the SMBJ family, so a single PCB layout can accommodate multiple voltage variants without a board spin.
Sourcing and lifecycle status
The base product number SMBJ24 covers both unidirectional and bidirectional variants — the CA suffix specifically denotes the bidirectional version. When ordering, confirm the polarity marking on the reel label matches the BOM callout.