It is not a standard Zener — the 'CA' suffix marks it as bidirectional, so it protects both polarities with a single device. Rated for 600W peak pulse power (10/1000µs waveform), it handles surges up to 93A in the 8/20µs shape, which covers most industrial and telecom transient requirements. The 20.5V reverse standoff means it stays off the rail below that DC voltage, drawing negligible leakage. Clamping at 42.8V max keeps downstream silicon safe within a typical 48V bus or 24V automotive transient budget.
Package and mounting — DO-214AA (SMB)
Surface-mount in the DO-214AA (SMB) package. The SMB footprint is a common one — same as many 600W-class TVS diodes — so board layout is straightforward if you are replacing or second-sourcing. Junction temperature range covers -55°C to 150°C, which suits outdoor telecom cabinets, industrial control enclosures, and under-hood automotive modules where the ambient can climb. No power line protection rating here (unidirectional only), but for DC rail clamping the bidirectional part is often preferred because it eliminates orientation concerns during assembly.
RoHS compliance is standard for the series; no separate qualification entry is needed for most BOM audits.