1.5SMC82: what it is and what the ratings mean
Rated 1.5 kW peak pulse power at 10/1000 µs waveforms, it sits above the rail at a typical reverse standoff of 70.1 V, breaks down at a minimum of 73.8 V, and clamps the spike to 118.65 V at the peak impulse current of 13.5 A — the clamping chain that defines TVS behaviour in overvoltage events. The 70.1 V standoff rating positions this part for 48 V nominal bus protection — the headroom between 48 V and 70.1 V accommodates common-mode transients on industrial 48 V rails without the TVS conducting in normal operation.
Sourcing reality — the part is obsolete
Littelfuse marks the 1.5SMC82 as obsolete. No official successor order code appears in the on-record cross-reference data. For a last-time-buy analysis, the peak pulse rating of 1.5 kW is the key parameter: if the design relies on that specific energy absorption rating, sourcing the genuine Littelfuse part through independent channels is the first path to evaluate. Confirm the BOM quantity against the available lot — the part ships on tape and reel per the original orderable packaging.