What the 1.5kW peak pulse rating means on the board
The 1.5SMC82AHE3/57T: This is the 1.5SMC series at 1.5 kW peak pulse, meaning it survives a single 10/1000 µs surge event without degradation; repeated or higher-energy transients exceed its defined SOA and the part can be destroyed. For automotive 12 V and 24 V rails the standoff and clamping figures are the two numbers that govern part selection. Reverse standoff of 70.1 V typ is the voltage the TVS sees in normal operation without conducting — the rail must sit below this in the unclamped state. When a transient exceeds the breakdown minimum of 77.9 V, the Zener Avalanche junction turns on and the clamping voltage of 113 V at 13.3 A peak pulse is what reaches the downstream load. The 13.3 A peak pulse rating is specific to the 10/1000 µs wave shape; a faster risetime pulse or a higher-energy surge at the same current will produce a higher clamping voltage because the Zener's dynamic resistance is not zero.
Active status and sourcing posture
The base product number 1.5SMC82 identifies the series family; alternative 1.5SMC82 variants in the same series share the same pinout and footprint but differ in standoff voltage — verify the 70.1 V standoff and 77.9 V minimum breakdown match your rail before specifying. Quoted to order against BOM quantity; availability and current lead times confirmed at RFQ.