The SMAJ64CA-13-F: The reverse standoff voltage is 64 V — the diode stays off below this. Breakdown starts at 71.1 V minimum, so a 64 V rail with 10 % tolerance (70.4 V max) sits below the breakdown threshold, avoiding nuisance conduction. At the full 400 W pulse, the clamp holds at 103 V maximum, giving a 32 V clamping window above the standoff. Single bidirectional channel means one device protects a pair of signal or power lines against both positive and negative transients — no series pairing needed. No power line protection (the diode is not designed for sustained overvoltage clamping on mains; it is for transient suppression on DC rails and signal lines).
Active production, standard package — sourcing posture
Diodes Incorporated lists this part as Active. The DO-214AC (SMA) package is a high-volume, widely stocked form factor — tape-and-reel packaging suits automated pick-and-place.