1500 W peak pulse in a DO-201 axial package
The 1.5KE68HE3/54: It clamps a 55.1 V reverse standoff to 98 V maximum at the 15.3 A peak pulse current (10/1000 µs waveform). The 1500 W rating at the 10/1000 µs waveform is the standard TVS power metric — it tells you the device can absorb a defined energy pulse without failing. For shorter transients (like 8/20 µs), the peak power capability is higher; for longer pulses, derate accordingly.
Automotive-grade transient protection
The unidirectional Zener structure (one channel) gives a sharp breakdown at 61.2 V minimum — the device starts conducting and clamping the transient before the voltage rises to the 98 V clamp ceiling. The 55.1 V standoff is the maximum DC voltage the diode blocks without conducting leakage current.
Obsolete — sourced through independent channels
Vishay lists the 1.5KE68HE3/54 as obsolete. No official successor order code is recorded.