{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"045106.3NR","brand":"Littelfuse Inc.","brandSlug":"littelfuse-inc","productSlug":"045106.3NR","canonicalUrl":"https://icboms.com/littelfuse-inc/045106.3NR","factsUrl":"https://icboms.com/api/mcp/products/045106.3NR","rawCanonicalId":null},"summary":{"shortDescription":"Littelfuse Inc. NANO²® 451 series, Board Mount (Cartridge Style Excluded) fast-blow SMD fuse, 045106.3NR, 6.3 A, 125 VAC/VDC, 50 A breaking capacity, 2-SMD square end block package.","salesMarkdown":"## What the 6.3 A rating and 50 A breaking capacity mean for your board The 045106.3NR is a Littelfuse NANO²® 451 series fast-blow SMD fuse rated 6.3 A at 125 VAC and 125 VDC. The 50 A breaking capacity at rated voltage means it can safely interrupt a fault current up to 50 A without rupturing or sustaining an arc — adequate for secondary-side protection in low-power AC/DC supplies and DC rails where the available fault current stays below that threshold. ## Lifecycle reality — obsolete, sourced through surplus channels Littelfuse lists the 045106.3NR as obsolete. No official successor is recorded. No pin-compatible drop-in replacement from Littelfuse is documented; a board-level change may be required if migrating to an active series. ## Package, mounting, and thermal envelope Housed in a 2-SMD square end block package measuring 6.10 mm x 2.69 mm x 2.69 mm, the fuse is surface-mount compatible with standard reflow profiles. The DC cold resistance of 0.0096 ohms keeps voltage drop low at rated current. ## Approvals and compliance documentation The 045106.3NR carries CSA, cURus, and PSE agency approvals, qualifying it for North American and Japanese markets. The melting I²t of 9.17 A²s aids coordination with downstream semiconductor fusing requirements.","metaTitle":"Littelfuse 045106.3NR NANO² 451 Fast-Blow SMD Fuse, 6.3 A","metaDescription":"Littelfuse 045106.3NR NANO² 451 fast-blow SMD fuse, 6.3 A, 125 VAC/VDC, 50 A breaking capacity. 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.","Color":"-","Series":"NANO²® 451","Package":"Tape & Reel (TR)","Fuse Type":"Board Mount (Cartridge Style Excluded)","Melting I²t":"9.17","Mounting Type":"Surface Mount","Response Time":"Fast Blow","Package / Case":"2-SMD, Square End Block","Product Status":"Obsolete","Approval Agency":"CSA, cURus, PSE","lifecycle_stage":"unknown","Size / Dimension":"0.240\\\" L x 0.106\\\" W x 0.106\\\" H (6.10mm x 2.69mm x 2.69mm)","DC Cold Resistance":"0.0096 Ohms","Voltage Rating - AC":"125 V","Voltage Rating - DC":"125 V","Current Rating (Amps)":"6.3 A","Operating Temperature":"-55°C ~ 125°C","Breaking Capacity @ Rated Voltage":"50A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.5926","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/b741f1b0e0a9e21e6a76cce2b8d96e45.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the closest alternative to 045106.3NR in the NANO² 451 series?","answer":"No official successor or pin-compatible alternative is recorded for the 045106.3NR. A functional replacement would require evaluating other Littelfuse SMD fuse families with similar 6.3 A, 125 V, fast-blow ratings and a 2-SMD square end block footprint, but no direct cross-reference is documented."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/littelfuse-inc/045106.3NR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/littelfuse-inc/045106.3NR 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}}