TVS clamping at 15 V standoff — what the 1.5 kW rating means
The 1.5SMCJ15CA-AQ clamps a 24.4 V maximum at a peak pulse current of 61.5 A, with a 16.7 V minimum breakdown — the standoff of 15 V sets the operating rail the protected node sees in normal state, and the clamping chain holds the transient below 24.4 V into that load.
Temperature grade and automotive fit
Junction temperature range is -50°C to 150°C, and the listed applications are automotive — this puts it in the class of parts sized for engine-adjacent or under-hood harness protection, where junction temperature during a surge event can spike well above ambient. The "AQ" suffix on the Diotec order code indicates automotive quality grade — listed alongside the automotive applications field, this signals the part is intended for harness-level transient suppression in vehicle electrical systems.
Package and sourcing posture
DO-214AB (SMC) surface-mount package — the large cathode pad area under the SMC body provides thermal relief during a clamping event; PCB layout should spread that pad to the copper plane.