TVS protection window and peak pulse rating
The 1.5SMC47CA: This gives a defined protection window: the line sits at 40.2V or below, the TVS starts conducting at ~44.7V, and the voltage is held to 64.8V at full rated current.
Package, temperature range, and mounting
The bidirectional single-channel configuration means there is no polarity to worry about during placement — the part clamps equally on positive and negative transients, which simplifies layout and reduces the risk of a reverse-install error on the line.