1500W bidirectional transient suppressor — now in the EOL channel
The 1.5KE24C: The 20.5V reverse standoff voltage means this part protects 24V DC buses, 24V AC secondary circuits, and similar rails where the normal operating voltage stays below 20.5V. The 21.6V minimum breakdown ensures the device starts conducting before the protected circuitry sees damaging overvoltage.
Clamping voltage and pulse current — the real protection envelope
At the 45.8A peak pulse current, the clamping voltage reaches 34.86V max. This is the voltage the downstream components must survive — a 24V-rated capacitor or IC with a 30V abs-max rating would be stressed beyond its limit, so the 1.5KE24C is best paired with 35V or higher-rated parts on the protected rail. The 1500W rating applies to the 10/1000µs exponential waveform per the TVS diode industry standard. For shorter pulses (8/20µs), the peak power capability is higher; for longer transients, derate accordingly. The DO-201AA axial-lead package handles the thermal pulse through the lead frame and the bulk silicon junction. At the high end, leakage current increases and the breakdown voltage shifts slightly, but the clamping voltage stays within the datasheet limits across the range.
Sourcing an obsolete TVS diode — the EOL reality
For existing BOM lines, the 1.5KE24C is available through independent surplus and broker channels. No pin-compatible direct replacement from Littelfuse is documented, so a board-level substitute would require validating a functionally equivalent TVS diode from another series or manufacturer.