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Littelfuse Inc. 1.5KE400C-B — Circuit Protection

Littelfuse 1.5KE400C-B Zener TVS, 1500W, DO-201

MPN1.5KE400C-B
Obsolete

Littelfuse 1.5KE series, Type Zener, Bidirectional TVS Diode, 1.5KE400C-B, 1500W Peak Pulse Power, 342V Reverse Standoff, DO-201AA / DO-27 Axial, Bulk.

$0.6800Ref. price · indicative, final on quote
Littelfuse Inc. 1.5KE400C-B datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

1.5KE400C-B specifications
ParameterValue
TypeZener
Series1.5KE
MountingThrough Hole
Voltage - breakdown360V
Voltage - clamping (Max) @ ipp575.4V
Voltage - reverse standoff342V
Current - peak pulse (10/1000μs)2.8A
Power - peak pulse1500W (1.5kW)
Power line protectionNo
Operating temperature-55°C ~ 175°C (TJ)
PackageBulk
ApplicationsGeneral Purpose
CaseDO-201AA, DO-27, Axial
Bidirectional channels1

Product details

1500 W bidirectional Zener TVS — 342 V standoff, DO-201 axial

The 1.5KE400C-B: A single bidirectional channel means this part replaces two unidirectional TVS diodes wired back-to-back, saving board space and reducing part count on bipolar lines such as RS-485, CAN bus, or ±24 V sensor supplies.

Clamping window and pulse current — what the ratings mean for the protection design

With a 342 V reverse standoff voltage, the diode does not conduct at the nominal rail voltage up to that level; leakage remains negligible until the transient exceeds the 360 V minimum breakdown, at which point the device avalanches and clamps the surge to a maximum 575.4 V.

Through-hole DO-201 package — board-fit and surge handling

No power line protection — the 1.5KE400C-B is not rated for continuous AC mains overvoltage clamping; it is intended for transient suppression on DC buses and signal lines where the steady-state voltage stays below 342 V.

Obsolete — sourcing through independent distribution

Littelfuse lists the 1.5KE400C-B as obsolete. Availability and pricing are confirmed at RFQ.

Frequently asked questions

What is the peak pulse power rating of the 1.5KE400C-B?

1500 W (1.5 kW) measured with the 10/1000 µs waveform. The clamping voltage at that pulse is 575.4 V maximum, limiting the peak pulse current to 2.8 A.

What package does the 1.5KE400C-B use?

DO-201AA / DO-27 axial leaded through-hole. The supplier device package is DO-201.

How can I source the 1.5KE400C-B for a legacy BOM?

The part is obsolete and available through independent distribution. Submit an RFQ with your target quantity; each lot is inspected and electrically verified against the original 1.5KE400C-B specifications before shipment.