1500 W peak pulse, 111 V standoff — what the ratings mean for your board
The 1.5SMC130C: The 111 V reverse standoff voltage means it sits across a nominal 100-110 V rail and stays off until a transient exceeds 117.45 V (minimum breakdown), at which point it clamps the surge to 187.95 V maximum while shunting 8.5 A peak pulse current. This is the clamping ceiling your downstream components must survive — if the DC-DC converter or IC behind it has a 200 V abs-max rating, this TVS keeps the transient below that threshold.
Obsolete — sourcing reality for the 1.5SMC130C
Littelfuse has marked the 1.5SMC130C as obsolete. The DO-214AB (SMC) footprint is common across the 1.5SMC family, so a parametric substitute with the same package and similar clamping voltage may be sourced; confirm the standoff and breakdown thresholds against your rail before committing a replacement.