Active production — no end-of-life risk for this BOM line
The 1.5KE100CA-E3/73: Vishay lists the 1.5KE100CA-/73 as Active. It clamps a transient to 137 V maximum at the rated 10.9 A peak pulse current (10/1000 µs waveform). The 85.5 V reverse standoff voltage means it sits across a DC rail up to that level without conducting appreciably — the device starts breaking down at a guaranteed minimum of 95 V.
1500 W peak pulse — sizing the surge margin
That 10.9 A peak current into the 137 V clamp defines the energy the diode can absorb in a single transient event. For a 24 V or 48 V DC bus, the 85.5 V standoff gives headroom against steady-state overvoltage while the breakdown threshold at 95 V triggers clamping before the downstream regulator's abs-max is hit. Through-hole DO-201AA / DO-27 axial package — the leads are formed for board mounting; the body stands off from the PCB, which helps thermal coupling to the ambient air during a surge event.
Bidirectional single channel — one device protects both polarities
A single bidirectional channel means the same device clamps positive and negative transients symmetrically — useful on AC signal lines or DC rails where reverse polarity is possible. No external bridge or second diode needed. The TransZorb series is Vishay's branded TVS family, and the base product number 1.5KE100 covers a range of standoff voltages in the same 1500 W platform.