{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"045102.5NR","brand":"Littelfuse Inc.","brandSlug":"littelfuse-inc","productSlug":"045102.5NR","canonicalUrl":"https://icboms.com/littelfuse-inc/045102.5NR","factsUrl":"https://icboms.com/api/mcp/products/045102.5NR","rawCanonicalId":null},"summary":{"shortDescription":"Littelfuse Inc. NANO²® 451 series, board mount SMD fuse, 2.5 A, 125 V AC/125 V DC, fast blow, 2-SMD square end block package, 50 A breaking capacity.","salesMarkdown":"## 2.5 A fast-blow SMD fuse — Littelfuse NANO² 451 series The Littelfuse 045102.5NR is a 2.5 A fast-blow surface-mount fuse from the NANO²® 451 series, rated for 125 V AC and 125 V DC with a breaking capacity of 50 A at rated voltage. The fast-blow response time means it opens quickly on overcurrents, protecting sensitive downstream components in board-level power paths. ## Package and board-fit Housed in a 2-SMD square end block package measuring 6.10 mm x 2.69 mm x 2.69 mm, this fuse is designed for surface-mount assembly on standard PCB pads. The tape and reel packaging (TR) supports automated pick-and-place for volume production. ## Electrical characteristics and approvals With a DC cold resistance of 0.0286 Ohms and a melting I²t of 1.029, this fuse offers predictable inrush withstand — useful for sizing protection in capacitive or inductive load circuits. Approved by CSA, PSE, and UL, the 045102.5NR carries the regulatory acceptance needed for equipment sold into North American and Japanese markets.","metaTitle":"045102.5NR Littelfuse NANO² 451 2.5A Fast-Blow SMD Fuse","metaDescription":"045102.5NR Littelfuse NANO²® 451 series, 2.5 A, 125 V AC/DC fast-blow SMD fuse. Obsolete — sourced to order. CSA, PSE, UL approved. Request a quote.","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":"1.029","Mounting Type":"Surface Mount","Response Time":"Fast Blow","Package / Case":"2-SMD, Square End Block","Product Status":"Obsolete","Approval Agency":"CSA, PSE, UL","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":"0.0286 Ohms","Voltage Rating - AC":"125 V","Voltage Rating - DC":"125 V","Current Rating (Amps)":"2.5 A","Operating Temperature":"-55°C~125°C","Breaking Capacity @ Rated Voltage":"50A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$2.9500","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/604a0e4c498aa97d2607992508357d04.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Where can I buy 045102.5NR or check stock?","answer":"This obsolete part is sourced to order against your BOM quantity through independent distribution."},{"question":"What is the breaking capacity of 045102.5NR?","answer":"50 A at the rated voltage of 125 V AC or DC — this is the maximum fault current the fuse can safely interrupt without rupturing."},{"question":"What approvals does 045102.5NR carry?","answer":"CSA, PSE, and UL — covering North American and Japanese regulatory requirements for equipment-level circuit protection."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/littelfuse-inc/045102.5NR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/littelfuse-inc/045102.5NR 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}}