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Littelfuse Inc. 1.5KE51-B — Circuit Protection

Littelfuse 1.5KE51-B TVS Diode, 1500W, DO-201, Obsolete

MPN1.5KE51-B
Obsolete

Littelfuse Inc. 1.5KE series Zener TVS diode, 1.5KE51-B, 1500W peak pulse, 43.6V reverse standoff, DO-201AA axial, unidirectional, bulk.

Littelfuse Inc. 1.5KE51-B datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

1.5KE51-B specifications
ParameterValue
TypeZener
Series1.5KE
MountingThrough Hole
Voltage - breakdown45.95V
Voltage - clamping (Max) @ ipp73.61V
Voltage - reverse standoff43.6V
Current - peak pulse (10/1000μs)21.7A
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

What the 1500 W peak-pulse rating means for circuit protection

The 1.5KE51-B: The single unidirectional channel in a DO-201AA axial package suits point-of-use transient suppression on a DC bus or signal line where the polarity is fixed.

Sourcing an obsolete TVS — what to expect

Inventory for this part moves through independent surplus and broker channels. Availability and pricing are lot-specific; a quote request confirms current stock and lead time for the exact quantity on your BOM.