{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"1.5KE400-B","brand":"Littelfuse Inc.","brandSlug":"littelfuse-inc","productSlug":"1.5KE400-B","canonicalUrl":"https://icboms.com/littelfuse-inc/1.5KE400-B","factsUrl":"https://icboms.com/api/mcp/products/1.5KE400-B","rawCanonicalId":null},"summary":{"shortDescription":"Littelfuse Inc. 1.5KE series Zener TVS diode, 1.5KE400-B, 1500W peak pulse power, 342V reverse standoff, 575.4V clamping, DO-201AA axial, bulk.","salesMarkdown":"Littelfuse lists the 1.5KE400-B as Obsolete. ## Key ratings for fit The reverse standoff voltage is 342 V, meaning the protected line can sit at up to 342 V DC without the diode conducting. Breakdown occurs at a minimum of 360 V, and the clamping voltage at peak current is 575.4 V — the voltage the load sees during a surge event. Peak pulse current is 2.8 A under the same 10/1000 µs waveform. The DO-201AA axial-lead package is through-hole — hand-solderable and easy to rework on a breadboard or prototype board. ## Where it fits in a circuit General-purpose transient suppression — clamping overvoltage spikes on AC or DC power rails, signal lines, or industrial control buses. The 342 V standoff suits 240 VAC or 300 VDC rails with margin.","metaTitle":"1.5KE400-B Littelfuse TVS Diode, 1500W, DO-201","metaDescription":"Littelfuse 1.5KE400-B Zener TVS diode, 1500W peak pulse, 342V standoff, DO-201 axial. Obsolete — sourced to order. Request a quote.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Obsolete","categoryPath":["Circuit Protection"],"specifications":{"Mfr":"Littelfuse Inc.","Type":"Zener","Series":"1.5KE","Package":"Bulk","Applications":"General Purpose","Mounting Type":"Through Hole","Package / Case":"DO-201AA, DO-27, Axial","Product Status":"Obsolete","lifecycle_stage":"unknown","Power - Peak Pulse":"1500W (1.5kW)","Base Product Number":"1.5KE","Operating Temperature":"-55°C ~ 175°C (TJ)","Power Line Protection":"No","Capacitance @ Frequency":"-","Supplier Device Package":"DO-201","Unidirectional Channels":"1","Voltage - Breakdown (Min)":"360V","Voltage - Clamping (Max) @ Ipp":"575.4V","Voltage - Reverse Standoff (Typ)":"342V","Current - Peak Pulse (10/1000µs)":"2.8A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.7800","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/149eca2cbf10498ecc0c7eab912fe9f4.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/1.5KE400-B/alternatives.json"},"ai":{"faq":[{"question":"How do I get pricing and availability for 1.5KE400-B?","answer":"Submit an RFQ. We source the 1.5KE400-B through independent distribution and surplus channels."},{"question":"What is the closest pin-compatible alternative to 1.5KE400-B?","answer":"No official pin-compatible successor is listed by Littelfuse. The 1.5KE series includes many voltage variants in the same DO-201 package — a part with a similar standoff voltage (e.g., 1.5KE350A or 1.5KE440A) may fit the same footprint, but the clamping and breakdown voltages differ. Verify the circuit's voltage tolerance before substituting."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/littelfuse-inc/1.5KE400-B","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/littelfuse-inc/1.5KE400-B when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-20T14:34:45.345Z","lastPublished":"2026-07-20T14:34:45.345Z","indexable":true}}