TVS clamping and the transient it stops
The 1.5KE47AE3/TR13: In a 48V telecom or industrial bus, the 40.2V standoff provides margin below the rail — the TVS stays dark during normal operation but clamps the first transient that exceeds the breakdown threshold. The 64.8V clamp at 23.2A keeps the downstream DC-DC input within its abs-max rating for a typical 75V bus converter.
Package and deployment in harsh environments
Housed in a DO-201AA / DO-27 axial-lead package (CASE-1), the 1.5KE47AE3/TR13 is a through-hole device — it solders into a board with a single drilled hole per lead and handles the thermal cycling of outdoor or industrial enclosures without solder-joint fatigue. The Tape & Reel packaging indicates this variant ships on a reel for automated insertion, though the through-hole format still requires a wave-solder or selective-solder step rather than reflow.
Obsolete — sourcing through independent channels
Microsemi has marked the 1.5KE47AE3/TR13 as Obsolete. For a BOM that requires this exact clamping voltage and package, the procurement path is a spot-market search against the 1.5KE47AE3/TR13 order code. A board-spin replacement would need a functionally equivalent 1500W unidirectional TVS with a 40V standoff and 64.8V clamp in an axial-lead DO-201 package — several manufacturers offer parametric matches, but pinout and footprint are identical across the DO-201 standard.