The 1.5SMC39CA TR13 PBFREE: This is a current-production part you can specify into a new design without worrying about a near-term obsolescence-driven board spin.
Three-voltage spec — which rail this TVS protects
Breakdown occurs at a minimum of 37.1V, and clamping is guaranteed at 53.9V maximum with the full 28A surge applied.
DO-214AB SMC — the board-fit footprint
The supplier device package is SMC — no special pad geometry beyond the standard JEDEC outline. Tape & Reel packaging suits automated pick-and-place assembly. No power-line protection rating — this is a general-purpose TVS for signal and low-voltage DC rails, not for AC mains or high-energy power distribution. The 'No' entry under Power Line Protection confirms it lacks the additional surge rating for direct mains connection.