Clamping voltage and peak pulse current define the protection envelope
The 1.5KE100CA-E3/54: Its 85.5V reverse standoff voltage means it sits across a nominal 85V rail without conducting leakage, then clamps transients at 137V maximum — the voltage the protected circuit must survive. The 10.9A peak pulse current rating at the 10/1000µs waveform defines the surge it can absorb; a transient exceeding this current will exceed the device's safe operating area. The 95V minimum breakdown voltage guarantees the avalanche triggers before the rail reaches the clamping ceiling.
Package and board integration
Housed in a DO-201AA (DO-27) axial leaded package, the 1.5KE100CA-/54 is a through-hole device — the leads solder into plated through-holes on the PCB, and the axial body stands off above the board. The 1.5KE supplier device package code matches the standard footprint for this series.
No pin-compatible second-source or official successor is recorded — the part is a single-source line item on the BOM.