What the 1500W peak pulse rating means on the line
The 1.5KE33CA-B: The 33 A peak pulse current at that waveform tells you the surge it handles before the clamping voltage rises to 45.7 V. The 45.7 V clamp means downstream components rated for 50 V or higher stay protected.
Obsolete — sourcing through surplus and broker channels
Available through independent surplus and broker distribution.
Bidirectional — swap it in without worrying about polarity
On a board where the rail polarity is not guaranteed (e.g. a floating signal line), this saves a diode bridge or a second part.
Through-hole DO-201 — fits a standard axial footprint
DO-201AA / DO-27 axial package, supplied in bulk. The through-hole leads suit boards that already have a 0.050-inch (1.27 mm) pitch hole pattern. No reflow profile needed — hand-solder or wave-solder in a standard production line.