1.5 kW bidirectional transient suppressor, DO-201 axial
The 1.5KE180C-B: The single bidirectional channel means the device protects against both positive and negative transients in a single package, simplifying board layout for AC or bipolar DC rails.
Clamping voltage and pulse current — the real protection envelope
For a 154 V rail, this clamping margin of roughly 104 V above the standoff means downstream components need a voltage rating above 258 V to survive a direct strike. The minimum breakdown voltage of 162 V ensures the device does not conduct at the nominal 154 V rail, but triggers before the voltage rises to damaging levels.
Obsolete — sourcing through independent channels
Littelfuse has marked the 1.5KE180C-B as obsolete. No official successor part number is recorded, so replacement requires a parametric cross-reference to a current bidirectional TVS in the same DO-201 package with matching standoff and clamping voltages. Available through independent surplus and broker channels. The DO-201 axial lead form factor is common, so a substitute from another manufacturer with the same 154 V standoff and 1500 W rating will fit the same PCB footprint.