Protection voltage window
The 5.0SMDJ64CA: The 64 V reverse standoff (typ) sets the working voltage below which the TVS is off and draws only leakage current; the 71.1 V minimum breakdown is where it enters conduction. When a transient exceeds that threshold, the clamping characteristic clamps the peak let-through at 103 V max regardless of how much current the event pushes through the part. The 5 kW peak pulse rating is the series-normalised energy ceiling for this family — confirm the board-level clamping voltage stays below the downstream IC damage threshold at that current.
Bidirectional protection for telecom signal paths
The CA suffix designates a bidirectional TVS — one channel that clamps both polarities — which is the standard fit for protecting differential telecom signal lines and power rails that ride above ground without a fixed polarity reference.
DO-214AB SMC footprint and sourcing posture
The DO-214AB (SMCJ) package is the standard two-terminal SMC body — the cathode band marks the polarity side for a unidirectional device, and the board pad follows the standard DO-214AB land pattern. Tape-and-reel packaging is compatible with standard SMT pick-and-place.