{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"0451008.MR","brand":"Littelfuse Inc.","brandSlug":"littelfuse-inc","productSlug":"0451008.MR","canonicalUrl":"https://icboms.com/littelfuse-inc/0451008.MR","factsUrl":"https://icboms.com/api/mcp/products/0451008.MR","rawCanonicalId":null},"summary":{"shortDescription":"Littelfuse Inc. NANO²® 451 series, Board Mount Surface Mount Fast Blow Fuse, 0451008.MR, 8 A, 125 V AC/DC, 50 A breaking capacity, 2-SMD square end block package, Tape & Reel.","salesMarkdown":"## 8 A fast-blow protection at 125 V — what the ratings mean The 0451008.MR: Rated 8 A continuous at 125 V AC and DC, this fuse clears overcurrents in a single-element fast-blow design — the response time is short enough to protect sensitive semiconductor circuits from short-circuit energy before the silicon fails. Breaking capacity is 50 A at the rated voltage — the fuse safely interrupts a fault current up to that level without rupturing the 2-SMD square end block package. For circuits with prospective short-circuit currents above 50 A, an upstream current-limiting device is needed. Melting I²t is 20.23 A²s — this value governs coordination with downstream components: a semiconductor rated for a lower I²t withstand may need a faster or smaller fuse ahead of it. DC cold resistance is 0.0077 Ohms, so the voltage drop at 8 A is about 62 mV — negligible in most low-voltage power paths but worth checking if the load rail has tight regulation. ## Approvals and temperature envelope The 0451008.MR carries CSA, PSE, and UL approvals — accepted in North American, Japanese, and many international markets without additional agency testing. The surface-mount package (6.10 mm x 2.69 mm x 2.69 mm) reflows on standard SMD profiles.","metaTitle":"0451008.MR Littelfuse NANO² 451 Fuse, 8A Fast Blow, 125V","metaDescription":"Littelfuse 0451008.MR NANO² 451 fast-blow SMD fuse, 8A at 125V AC/DC, 50A breaking capacity. Obsolete — sourced to order against RFQ. CSA, PSE, UL approved.","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":"20.23","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":"0.0077 Ohms","Voltage Rating - AC":"125 V","Voltage Rating - DC":"125 V","Current Rating (Amps)":"8 A","Operating Temperature":"-55°C ~ 125°C","Breaking Capacity @ Rated Voltage":"50A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$2.7000","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/2e33e7b2503f3f5110226be89402b64a.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the closest alternative to the 0451008.MR in the NANO² 451 series?","answer":"No official pin-compatible successor is listed by Littelfuse for the 0451008.MR. For a new design, consider the current-generation NANO² SMD fuse families with similar 8 A fast-blow ratings in the same 2-SMD square end block footprint."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/littelfuse-inc/0451008.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/0451008.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}}