{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"0451007.MR","brand":"Littelfuse Inc.","brandSlug":"littelfuse-inc","productSlug":"0451007.MR","canonicalUrl":"https://icboms.com/littelfuse-inc/0451007.MR","factsUrl":"https://icboms.com/api/mcp/products/0451007.MR","rawCanonicalId":null},"summary":{"shortDescription":"Littelfuse Inc. NANO²® 451 series, Board Mount (Cartridge Style Excluded), Fast Blow, 7 A, 125 V AC/DC, 50 A Breaking Capacity, Surface Mount, 2-SMD Square End Block, Tape & Reel.","salesMarkdown":"## 7 A fast-blow fuse in a compact SMD package The Littelfuse 0451007.MR is a NANO²® 451 series surface-mount fuse rated 7 A at 125 V AC and 125 V DC. The fast-blow response clears overcurrents quickly, and the 50 A breaking capacity at rated voltage means it safely interrupts short-circuit faults up to that level without rupturing. ## Sourcing an obsolete part Littelfuse has marked the 0451007.MR as Obsolete. Sourcing is through independent distribution channels; availability and pricing are confirmed at RFQ against the BOM quantity. ## What the ratings mean for the board The 10.32 melting I²t gives a measure of the energy required to open the fuse — useful for coordinating with downstream components and ensuring the fuse clears before the PCB trace or semiconductor junction exceeds its surge rating. DC cold resistance is 0.009 Ohms, so the voltage drop at 7 A is under 63 mV — negligible in a 125 V rail. Approvals from CSA, PSE, and UL mean the fuse is accepted in North American and Japanese regulatory jurisdictions — a signal for compliance-driven BOMs.","metaTitle":"Littelfuse 0451007.MR NANO² 451 Fast Blow Fuse, 7 A, 125 V","metaDescription":"Littelfuse 0451007.MR NANO²® 451 surface-mount fast-blow fuse, 7 A, 125 V AC/DC, 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":"10.32","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":"0.009 Ohms","Voltage Rating - AC":"125 V","Voltage Rating - DC":"125 V","Current Rating (Amps)":"7 A","Operating Temperature":"-55°C ~ 125°C","Breaking Capacity @ Rated Voltage":"50A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.4600","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/2e33e7b2503f3f5110226be89402b64a.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the closest alternative to 0451007.MR?","answer":"A parametric search within the NANO²® 451 series for the same 2-SMD square end block package, 7 A rating, and fast-blow characteristic would identify functional equivalents, but a board-level qualification is required."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/littelfuse-inc/0451007.MR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/littelfuse-inc/0451007.MR 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}}