{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"1.5KE540","brand":"Littelfuse Inc.","brandSlug":"littelfuse-inc","productSlug":"1.5KE540","canonicalUrl":"https://icboms.com/littelfuse-inc/1.5KE540","factsUrl":"https://icboms.com/api/mcp/products/1.5KE540","rawCanonicalId":null},"summary":{"shortDescription":"Littelfuse Inc. 1.5KE series Zener TVS diode, 1.5KE540, 1500W peak pulse power, 777V clamping, 2A peak pulse current, DO-201AA axial, through hole, unidirectional.","salesMarkdown":"## What the 1500 W rating means in a transient event The 1.5KE540: That 777 V clamping voltage is the ceiling the diode holds the line to during the surge; downstream components see no more than that. ## Breakdown and standoff — the two voltages that define the protection window The reverse standoff voltage is 486 V — the diode stays off below this, so normal 480 V bus ripple does not trigger leakage. Breakdown starts at a minimum of 486 V, meaning the diode begins conducting right at the standoff threshold, leaving no dead zone between normal operation and protection. ## Obsolete — sourcing through independent channels Littelfuse has marked the 1.5KE540 as obsolete. No pin-compatible direct replacement from Littelfuse is documented — a board-level substitution would require re-evaluating the clamping voltage and package footprint.","metaTitle":"Littelfuse 1.5KE540 TVS Diode, 1500W, DO-201, Obsolete","metaDescription":"Littelfuse 1.5KE540 Zener TVS diode, 1500W peak pulse, 777V clamping, 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":"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","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":"$0.8900","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/f1ea870152ad203d90f672f2af1c1ed0.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Where can I buy the 1.5KE540?","answer":"The 1.5KE540 is obsolete but available through independent distribution."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/littelfuse-inc/1.5KE540","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 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}}