{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"1.5KE540-B","brand":"Littelfuse Inc.","brandSlug":"littelfuse-inc","productSlug":"1.5KE540-B","canonicalUrl":"https://icboms.com/littelfuse-inc/1.5KE540-B","factsUrl":"https://icboms.com/api/mcp/products/1.5KE540-B","rawCanonicalId":null},"summary":{"shortDescription":"Littelfuse Inc. 1.5KE series Zener TVS diode, 1.5KE540-B, 1500W peak pulse, 777V clamping, DO-201AA/DO-27 axial, bulk.","salesMarkdown":"## Obsolete — sourcing through independent channels Littelfuse has marked the 1.5KE540-B as Obsolete. Sourcing runs through independent surplus and broker inventory — quantities and pricing confirmed at RFQ. ## 1.5 kW Zener TVS in a DO-201 axial package It clamps at 777 V max and handles a peak pulse current of 2 A. The reverse standoff voltage is 486 V, with breakdown at 486 V min. Housed in a DO-201AA / DO-27 axial-lead package, it mounts through-hole and is supplied in bulk. The operating junction temperature range spans -55°C to 175°C, suitable for industrial and telecom environments where the ambient sees wide swings. ## What the clamping voltage means for your rail A 777 V clamp means the TVS limits transients to that peak — equipment rated for 600 V nominal sees protection below its insulation breakdown. The 486 V standoff lets the diode sit across a 480 V DC bus without conducting in normal operation.","metaTitle":"1.5KE540-B Littelfuse TVS Diode, 1.5kW, 777V Clamp","metaDescription":"Littelfuse 1.5KE540-B Zener TVS diode, 1500W peak pulse, 777V clamping, DO-201. Obsolete — sourced to order against RFQ.","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)":"486V","Voltage - Clamping (Max) @ Ipp":"777V","Voltage - Reverse Standoff (Typ)":"486V","Current - Peak Pulse (10/1000µs)":"2A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/149eca2cbf10498ecc0c7eab912fe9f4.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Where can I buy 1.5KE540-B and how do I get a price?","answer":"The 1.5KE540-B is obsolete and sourced through independent distribution. No stock-holding claim is made."},{"question":"What is 1.5KE540-B's listed type and series?","answer":"It is a Zener TVS diode in the 1.5KE series."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/littelfuse-inc/1.5KE540-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/1.5KE540-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}}