1500W peak pulse, 33.3V standoff — what the ratings mean for your protection rail
The 1.5KE39A-B: The 33.3 V reverse standoff voltage means it begins conducting only when the line exceeds that level, protecting downstream components rated for 30 V or less. Breakdown occurs at a minimum of 37.1 V, so a 36 V nominal rail sees no leakage under normal conditions; the 53.9 V clamp limits the transient to a safe level for most 40 V-rated silicon.
Obsolete — sourcing reality and the surplus channel
Availability runs through independent surplus and broker channels; each lot is date-code and condition verified before commitment.
DO-201 through-hole — board-fit and handling
Supplied in the DO-201AA (DO-27, axial) package — a 0.210-inch body diameter with 0.040-inch lead diameter, suited for through-hole soldering on single-sided or double-sided boards. The bulk packaging means parts are loose in a bag, not taped and reeled; plan for manual or tube-fed insertion.