Clamping voltage and peak pulse handling
The 1.5SMC91A TR13 PBFREE: The 1500 W peak pulse rating places this part in the mid-range TVS class, suitable for secondary protection on DC rails where the clamping level must stay below the downstream semiconductor abs-max without letting the transient energy through — a 125 V clamp at 12 A dissipates the bulk of a surge before the protected node sees damage.
Thermal margin and package fit
Junction temperature is rated -65°C to 150°C, giving wide margin for transient self-heating during clamping events — the 150°C ceiling is the governing limit for peak pulse derating; above it the clamping voltage characteristic shifts and long-term reliability degrades. The DO-214AB (SMC) package is the standard foot print shared across most 1.5 kW TVS families — land pattern, solder joint geometry, and thermal pad design follow the IPC-7351B generic pattern for this body size, so board integration is straightforward.