{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"1.5KE51C-B","brand":"Littelfuse Inc.","brandSlug":"littelfuse-inc","productSlug":"1.5KE51C-B","canonicalUrl":"https://icboms.com/littelfuse-inc/1.5KE51C-B","factsUrl":"https://icboms.com/api/mcp/products/1.5KE51C-B","rawCanonicalId":null},"summary":{"shortDescription":"Littelfuse Inc. 1.5KE series Zener TVS diode, bidirectional, 1500W peak pulse power, 43.6V reverse standoff, DO-201AA axial package, bulk.","salesMarkdown":"## EOL status — this part has a last-time-buy The 1.5KE51C-B is marked Obsolete by Littelfuse, which means the manufacturer has closed the last-time-buy window and no longer produces it. Any available stock is what remains in the distribution channel or surplus market. ## What the 1.5kW rating means for the circuit The clamping voltage of 73.61V at 21.7A peak pulse current tells you the maximum voltage the protected node sees during that event. The DO-201AA (DO-27) axial-lead package is a through-hole format — the leads insert into plated holes on a PCB or terminate into a terminal block. The 1.5KE series uses this same body across all voltage variants, so the footprint is standard across the family. The wide Tj envelope suits outdoor or engine-bay transient protection where ambient heat adds to the self-heating from the surge.","metaTitle":"Littelfuse 1.5KE51C-B TVS Diode, 1.5kW, 43.6V Standoff","metaDescription":"Littelfuse 1.5KE51C-B obsolete Zener TVS diode, 1500W peak power, 43.6V standoff, bidirectional. 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","Bidirectional Channels":"1","Capacitance @ Frequency":"-","Supplier Device Package":"DO-201","Voltage - Breakdown (Min)":"45.95V","Voltage - Clamping (Max) @ Ipp":"73.61V","Voltage - Reverse Standoff (Typ)":"43.6V","Current - Peak Pulse (10/1000µs)":"21.7A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.6300","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/149eca2cbf10498ecc0c7eab912fe9f4.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the 1.5KE51C-B's type and series?","answer":"It is a Zener-type TVS diode in the Littelfuse 1.5KE series. It is a bidirectional device with a single protection channel."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/littelfuse-inc/1.5KE51C-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/1.5KE51C-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}}