What the 1.5SMC62 is and where it lives
Rated for 1500 W peak pulse power at 10/1000 µs waveforms, it protects a downstream node from transient surges — the 1.5 kW rating defines the energy the part can absorb and clamp without failing. General-purpose application classification means it is not a dedicated data-line or USB protection part — it is a rail-level suppressor suited for power-supply input stages, distribution buses, and motor-drive AC lines where the standoff voltage aligns with the system rail.
The clamping chain: what each voltage means for the protected node
53 V reverse standoff is the maximum voltage the TVS sees in normal operation without conducting — the protected rail should sit at or below this level continuously. The clamping voltage at 89.25 V is the decisive number for downstream IC withstand — any protected load must survive a brief 89.25 V spike at up to 17.9 A during the surge event. A single unidirectional channel means it handles one polarity only — for bipolar or AC-line protection a second device in the opposite direction is required.