What the 1500 W peak pulse rating means for your protection budget
The 1.5KE6.8A-E3/54: That 1500 W figure is the device's ability to clamp a transient without failing — it is not the steady-state power. The 143 A peak pulse current at the 10/1000 µs waveform tells you the diode can sink a substantial surge, but the actual current the line sees depends on the source impedance of the transient.
Package and board integration
Housed in a DO-201AA (DO-27) axial-lead through-hole package, the 1.5KE6.8A-/54 is a hand-solderable or wave-solderable part. The axial leads require through-hole vias on the PCB — the lead diameter and hole size must match the manufacturer's recommended footprint to avoid stress on the solder joint during thermal cycling. The supplier device package is marked as 1.5KE, consistent with the series. The part is available in Tape & Reel (TR) or Cut Tape (CT) packaging for different assembly volumes.