Obsolete part — sourcing through independent channels
The 1.5KE56CAHE3/51 is listed as obsolete by Vishay, meaning the manufacturer no longer produces this exact order code.
For a 48 V nominal rail, this TVS provides a clamp that stays below the downstream device's absolute maximum rating.
The 1.5KE package suffix indicates the body size; the leads are tin-plated copper for solderability. For new layouts, the axial lead spacing and hole diameter follow the DO-201AA land pattern — no special thermal pad is required, but the copper trace width to the leads should handle the 19.5 A peak pulse current without fusing.