Clamping window and junction temperature range
The 1.5KE30CA-T: The 25.6 V reverse standoff is the maximum DC or AC peak voltage the protected line can carry without the TVS conducting leakage current. Above 28.5 V the device starts to break down, and at 41.4 V it hard-clamps the transient — so the protected circuitry must survive that clamp voltage for the pulse duration. A 36 A peak pulse current at the 10/1000 µs test waveform gives the surge capacity for typical industrial transient events like inductive load switching or lightning-induced surges on long cable runs. The 1500 W rating is specified at 25°C; derate above that per the power dissipation curve in the full datasheet. No power line protection feature — this is a standalone transient clamp, not a filtered or coordinated protection IC.
Obsolete — sourcing through independent channels
Diodes Incorporated lists the 1.5KE30CA-T as obsolete. For a BOM line that requires this exact clamp voltage and package, the 1.5KE30CA-T remains orderable against an RFQ. No pin-compatible direct replacement from Diodes Inc is documented; a parametric search for 1500 W bidirectional TVS in DO-201 with 25.6 V standoff and 41.4 V clamp will surface functional equivalents from other brands, but a board spin may be needed if the footprint or lead form differs.