What the 5kW rating does on an automotive board
The 5.0SMDJ33A-QH: Rated 5000 W peak pulse power at a 10/1000 µs wave shape, it clamps transient overvoltage events that would otherwise propagate into downstream circuitry. The reverse standoff voltage of 33 V typ sets the continuous working voltage; the part remains inactive during normal operation and activates only on a transient exceedance.
Temperature and qualification for under-hood deployment
At 150°C junction, the Zener leakage current rises above the room-temperature figure, so thermal management matters in tightly packed modules where the TVS shares a heatsink plane with downstream components.
Sourcing posture for BOM entry
Bourns lists the 5.0SMDJ33A-QH as Active. For new automotive designs the part is a valid BOM entry; the tape-and-reel packaging suits standard SMT assembly lines.