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Littelfuse Inc. 1.5KE12-B — Circuit Protection

1.5KE12-B Littelfuse TVS Diode, 1500W, DO-201

MPN1.5KE12-B
Obsolete

Littelfuse Inc. 1.5KE series Zener TVS diode, 1500W peak pulse power, 10.2V reverse standoff, 10.8V breakdown, 17.54V clamping, 91A peak pulse current, DO-201AA axial, Bulk.

Littelfuse Inc. 1.5KE12-B datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

1.5KE12-B specifications
ParameterValue
TypeZener
Series1.5KE
MountingThrough Hole
Voltage - breakdown10.8V
Voltage - clamping (Max) @ ipp17.54V
Voltage - reverse standoff10.2V
Current - peak pulse (10/1000μs)91A
Power - peak pulse1500W (1.5kW)
Power line protectionNo
Operating temperature-55°C~175°C(TJ)
PackageBulk
ApplicationsGeneral Purpose
CaseDO-201AA, DO-27, Axial
Unidirectional channels1

Product details

Littelfuse has marked the 1.5KE12-B as obsolete.

Clamping performance and protection envelope

The 10.2 V reverse standoff means the diode stays in standby below that DC voltage — it only conducts during the overvoltage event. Breakdown occurs at 10.8 V minimum, giving a narrow guard band between the nominal rail and the clamping threshold — useful for protecting 12 V buses where the regulation tolerance is tight.

Package and integration note

Housed in a DO-201AA (DO-27) axial-lead package, the 1.5KE12-B mounts through-hole. The DO-201 footprint is standard across the 1.5KE series, so a board already laid out for a sibling in this family accepts this part without a layout change.

Frequently asked questions

What is the closest alternative to the 1.5KE12-B in the same family?

The 1.5KE series shares the same DO-201 package and 1500 W peak pulse rating across multiple voltage variants. A direct functional replacement requires matching the 10.2 V standoff, 10.8 V breakdown, and 17.54 V clamping — any sibling with those same thresholds is a drop-in fit.