Clamping a 100V rail with a 1500W bidirectional TVS
The YAGEO 1.5KE100CA/B is a bidirectional Zener-type TVS diode from the 1.5KE series, packing 1500W (1.5kW) of peak pulse power into a through-hole DO-201AA (DO-27, Axial) package. The single bidirectional channel means it protects both polarities on the same line, which simplifies board layout for AC-coupled or floating signal rails where the transient polarity is unknown.
What the 1500W rating means for your rail protection
For shorter pulses (8/20µs, common in ESD or lightning), the peak power capability is higher, but the 10/1000µs rating is the conservative anchor for power-supply and industrial transient protection. The 95V minimum breakdown ensures it does not conduct during normal operation, while the 137V clamp limits the transient to a safe level for downstream semiconductors rated at 150V or higher. The power line protection flag is 'No' — this is a general-purpose transient suppressor, not a dedicated AC mains protector. It is best applied on DC buses, signal lines, or low-voltage AC rails where the steady-state voltage stays below 85.5V.
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