{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"0451.080NR","brand":"Littelfuse Inc.","brandSlug":"littelfuse-inc","productSlug":"0451.080NR","canonicalUrl":"https://icboms.com/littelfuse-inc/0451.080NR","factsUrl":"https://icboms.com/api/mcp/products/0451.080NR","rawCanonicalId":null},"summary":{"shortDescription":"Littelfuse NANO²® 451 series, 0451.080NR, board mount SMD fuse, 80 mA, 125 VAC/DC, fast blow, 2-SMD square end block package, 50 A breaking capacity.","salesMarkdown":"## 80 mA fast-blow SMD fuse — NANO² 451 series The 0451.080NR is a Littelfuse NANO²® 451 series board-mount fuse rated 80 mA at 125 VAC and 125 VDC, with a fast-blow response time. Its 50 A breaking capacity at rated voltage means it safely interrupts a short-circuit fault up to that level without rupturing the package — a critical parameter for secondary-side protection in power supplies where the prospective fault current can hit tens of amps. The 0.00033 melting I²t figure tells you the energy needed to open the element; at 80 mA nominal load, this fuse clears fast on a hard overcurrent, but the low I²t also means it may nuisance-open on inrush pulses from a capacitive input filter if the pulse energy exceeds that threshold. ## Surface-mount footprint and temperature envelope Housed in a 2-SMD square end block package measuring 6.10 mm x 2.69 mm x 2.69 mm, the 0451.080NR mounts directly on the PCB — no through-hole leads, so the solder joint is the only mechanical anchor. ## Obsolete — sourcing through independent channels Littelfuse has marked the 0451.080NR as obsolete. No pin-compatible drop-in replacement from Littelfuse has been published, so a board spin or a parametric substitute search is the path for new designs.","metaTitle":"0451.080NR Littelfuse NANO² 451 80mA Fast Blow SMD Fuse","metaDescription":"0451.080NR Littelfuse NANO² 451 series, 80mA, 125VAC/DC, fast-blow SMD fuse. Obsolete — sourced to order against RFQ. 50A breaking capacity.","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":"0.00033","Mounting Type":"Surface Mount","Response Time":"Fast Blow","Package / Case":"2-SMD, Square End Block","Product Status":"Obsolete","Approval Agency":"CSA, cULus","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":"4.05 Ohms","Voltage Rating - AC":"125 V","Voltage Rating - DC":"125 V","Current Rating (Amps)":"80 mA","Operating Temperature":"-55°C~125°C","Breaking Capacity @ Rated Voltage":"50A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/93a301cacf56880fc0553832fd7cd1d0.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Where can I buy 0451.080NR and how do I get a price?","answer":"The 0451.080NR is obsolete but available through independent surplus channels."},{"question":"What approvals does the 0451.080NR carry?","answer":"The fuse is certified by CSA and cULus, covering North American and Canadian safety standards for branch-circuit and supplementary protection."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/littelfuse-inc/0451.080NR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/littelfuse-inc/0451.080NR 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}}