What the 1500W peak pulse rating means for your protection design
The 1.5KE130-B: That 1.5 kW capability means it can clamp a transient surge up to 8.5 A peak pulse current without failing — the clamping voltage at that current is 187.95 V max, so downstream silicon sees a hard voltage ceiling during the event. The reverse standoff voltage is 111 V, meaning the diode stays transparent on a 100 V or 110 V rail and only starts conducting when the transient exceeds the minimum breakdown voltage of 117.45 V.
Package and board-fit: DO-201AA axial leaded
Housed in a DO-201AA (DO-27) axial leaded package, the 1.5KE130-B is a through-hole part — the leads insert into plated through-holes on the PCB and are wave-soldered or hand-soldered. The wide junction temperature window means the diode can be placed near hot components (power FETs, magnetics) without derating the surge capability at elevated ambient.
Lifecycle reality: obsolete, sourced through independent channels
Littelfuse has marked the 1.5KE130-B as obsolete. For sustainment programs — medical, defense, or industrial control systems that already have this diode in the BOM — the part is available through independent surplus and broker channels. Because the 1.5KE series shares a common DO-201 footprint and pinout across voltage ratings, a functional replacement at a different voltage (e.g., 1.5KE120A or 1.5KE150A) may fit the same PCB land pattern, but the clamping voltage and standoff must be re-verified against the protected rail.