The 1.5SMC11A TR13 PBFREE: For a 24V nominal rail with a 9.4V reverse standoff, this part triggers at a minimum breakdown of 10.5V and clamps at 15.6V maximum, defining the protection window from the rail's normal operating voltage to the downstream device's absolute maximum rating. The unidirectional channel means it protects one signal or power line against positive transients — the cathode band goes toward the rail, anode to ground. For AC or bidirectional protection, two parts are needed back-to-back.
Package, mounting, and temperature envelope
DO-214AB SMC is the standard surface-mount package for 1500W TVS diodes — the large copper tab on the bottom side is the primary thermal path. The package footprint matches standard SMC land patterns — no special pad geometry beyond the recommended copper area for thermal dissipation.