Clamping voltage and pulse current — the real protection envelope
The 1.5KE110CA-E3/54: The 152 V clamp sets the voltage the downstream circuitry must survive — if the protected rail is rated for 100 V continuous, this TVS holds the transient below that ceiling for the duration of the pulse. The 9.9 A peak pulse current at clamp tells you the surge the diode can sink before the junction temperature exceeds its rating.
DO-201AA axial package — board integration and thermal path
Housed in a DO-201AA (DO-27) axial-lead package, the 1.5KE110CA-/54 mounts through-hole. The lead diameter and body length set the hole size and board clearance — the axial leads carry the pulse current to the PCB copper, so the trace width from the pad to the protected rail should be sized for the 9.9 A peak without fusing. The wide temp range means derating is minimal at typical board temperatures.