{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"1.5KE540C","brand":"Littelfuse Inc.","brandSlug":"littelfuse-inc","productSlug":"1.5KE540C","canonicalUrl":"https://icboms.com/littelfuse-inc/1.5KE540C","factsUrl":"https://icboms.com/api/mcp/products/1.5KE540C","rawCanonicalId":null},"summary":{"shortDescription":"Littelfuse 1.5KE Series Zener TVS Diode, 1.5KE540C, Bidirectional, 1500W Peak Pulse, 486V Breakdown, DO-201AA Axial, Tape & Reel.","salesMarkdown":"## Obsolete TVS diode — what the ratings mean for your BOM The 1.5KE540C: At 486 V reverse standoff, it clamps transients to 777 V maximum while conducting 2 A peak pulse current — this is the surge capacity that protects downstream silicon from lightning-induced or inductive-load transients in a 480 V bus environment. ## Lifecycle reality — discontinued, sourced through surplus channels The 1.5KE540C carries an official Obsolete product status from Littelfuse, meaning the manufacturer no longer produces this device. No successor order code is recorded on the lifecycle entry. For a BOM line locked to this part number, supply now runs through independent surplus and broker channels. Any available stock carries date codes from the last production run, and authenticity verification — marking, package construction, and electrical test — becomes the buyer's screening step before committing to a lot. ## Package and board-fit note — DO-201AA axial leaded Housed in a DO-201AA (DO-27) axial-leaded package, the 1.5KE540C mounts through a single hole in the PCB. The copper lead diameter and body length determine the hole and pad geometry — the datasheet mechanical drawing specifies the lead spacing and the solder fillet clearance for wave or hand-solder assembly. The operating junction temperature range spans -55°C to +175°C, covering industrial and automotive under-hood thermal profiles. At the high end, derate the peak pulse power per the manufacturer's thermal curve — the 1500 W rating holds at 25°C and drops linearly above that.","metaTitle":"1.5KE540C Littelfuse TVS Diode, 1500W, Bidirectional","metaDescription":"1.5KE540C Littelfuse Zener TVS diode, 1500W peak pulse, 486V breakdown, DO-201 package. Obsolete status; 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":"Tape & Reel (TR)","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)":"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/f1ea870152ad203d90f672f2af1c1ed0.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Where can I buy the 1.5KE540C and how do I get a price?","answer":"The 1.5KE540C is obsolete and sourced through independent surplus distribution. Submit a request with your target quantity and date-code preference; the desk will return a firm offer with traceability documentation."},{"question":"What is the closest pin-compatible alternative to 1.5KE540C in this Circuit Protection family?","answer":"No official cross-reference or pin-compatible alternative is recorded in the lifecycle entry for this part. A replacement would need to match the 1500 W peak pulse rating, 486 V breakdown voltage, bidirectional polarity, and DO-201 package — any parametric substitute must be verified against the original BOM requirements."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/littelfuse-inc/1.5KE540C","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/littelfuse-inc/1.5KE540C 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}}