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Littelfuse Inc. 1.5KE300-B — Circuit Protection

1.5KE300-B Littelfuse TVS Diode, 1500W, DO-201

MPN1.5KE300-B
Obsolete

Littelfuse Inc. 1.5KE series Zener TVS diode, 1.5KE300-B, 1500W peak pulse power, 434.7V clamping, DO-201AA axial, bulk.

Littelfuse Inc. 1.5KE300-B datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

1.5KE300-B specifications
ParameterValue
TypeZener
Series1.5KE
MountingThrough Hole
Voltage - breakdown270V
Voltage - clamping (Max) @ ipp434.7V
Voltage - reverse standoff256V
Current - peak pulse (10/1000μs)3.7A
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 ratings mean for the BOM

The 1.5KE300-B: The 256 V reverse standoff voltage means the diode stays off below that line voltage — it won't leak or clamp during normal 240 VAC or 250 VDC rail operation. The DO-201 package's axial leads carry the heat into the board; a short lead length and generous pad area improve the thermal coupling.

The 1.5KE300-B is marked obsolete by Littelfuse. No pin-compatible drop-in from the same manufacturer is documented, so a board-level redesign may be needed if a functional replacement is required.