{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"1.5KE440-B","brand":"Littelfuse Inc.","brandSlug":"littelfuse-inc","productSlug":"1.5KE440-B","canonicalUrl":"https://icboms.com/littelfuse-inc/1.5KE440-B","factsUrl":"https://icboms.com/api/mcp/products/1.5KE440-B","rawCanonicalId":null},"summary":{"shortDescription":"Littelfuse Inc. 1.5KE series Zener TVS diode, 1.5KE440-B, unidirectional, 1500W peak pulse power, 632.1V clamping, DO-201AA axial through-hole, bulk.","salesMarkdown":"## Obsolete status and what it means for your BOM The 1.5KE440-B: This part is officially obsolete per the manufacturer's lifecycle record. That means Littelfuse no longer manufactures it, and no last-time-buy window remains open through the factory channel. Any stock you find is from existing inventory — date codes and provenance need verification at the point of sourcing. ## Protection specifications for circuit design It clamps transient overvoltages at a maximum of 632.1V when conducting its peak pulse current of 2.5A. The reverse standoff voltage is 376V, meaning the device does not conduct appreciably below this level. Breakdown occurs at a minimum of 396V, triggering the clamping action that protects downstream circuitry. ## Package and board integration Housed in a DO-201AA / DO-27 axial leaded package (supplier device package DO-201), it is a through-hole component intended for hand-insertion or wave-solder assembly. The axial leads require drilled plated-through holes on the PCB. The bulk packaging means parts are supplied loose in a bag or tube, not on tape and reel — factor this into your pick-and-place planning if you are mixing through-hole with SMT assembly. Note that the spec sheet indicates no power line protection — this device is designed for signal or low-power rail transient suppression, not for continuous overvoltage clamping on mains or high-current power buses.","metaTitle":"Littelfuse 1.5KE440-B Zener TVS Diode, 1.5kW, 632.1V Clamp","metaDescription":"Obsolete Littelfuse 1.5KE440-B Zener TVS diode, 1.5kW peak pulse power, 632.1V clamping, DO-201 package. 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)":"396V","Voltage - Clamping (Max) @ Ipp":"632.1V","Voltage - Reverse Standoff (Typ)":"376V","Current - Peak Pulse (10/1000µs)":"2.5A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/149eca2cbf10498ecc0c7eab912fe9f4.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What package does the 1.5KE440-B use?","answer":"It uses a DO-201AA / DO-27 axial leaded through-hole package (supplier device package DO-201). The leads are intended for insertion into plated through-holes on a PCB."},{"question":"Where can I source the obsolete 1.5KE440-B?","answer":"We source this part through independent distribution channels against an RFQ. Submit a request with your target quantity and required date-code window."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/littelfuse-inc/1.5KE440-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/1.5KE440-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}}