{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"045101.6MR","brand":"Littelfuse Inc.","brandSlug":"littelfuse-inc","productSlug":"045101.6MR","canonicalUrl":"https://icboms.com/littelfuse-inc/045101.6MR","factsUrl":"https://icboms.com/api/mcp/products/045101.6MR","rawCanonicalId":null},"summary":{"shortDescription":"Littelfuse NANO²® 451 series, Board Mount SMD fuse, Fast Blow, 1.6 A, 125 V AC/DC, 50 A breaking capacity, 2-SMD square end block package, Tape & Reel.","salesMarkdown":"## What the 1.6 A rating means on the bench The Littelfuse 045101.6MR is a NANO²® 451 series surface-mount fuse rated 1.6 A at 125 V AC or DC. The fast-blow characteristic means it clears quickly on moderate overcurrents — the 1.06 melting I²t figure tells you the energy needed to open it, which matters when coordinating with downstream silicon that may fail short before the fuse blows. Breaking capacity is 50 A at rated voltage, so it safely interrupts faults up to that level without rupturing the package. The 0.058 ohm cold resistance adds a voltage drop of under 100 mV at rated current — negligible for most 125 V rails but worth checking if the load is marginal on headroom. ## Obsolete — sourcing reality for this SMD fuse Littelfuse lists the 045101.6MR as obsolete. No pin-compatible drop-in replacement is documented by Littelfuse; a parametric search for 1.6 A fast-blow SMD fuses in the 2-SMD square end block footprint is the practical path for a BOM update. The approvals — CSA, PSE, UL — mean this fuse was accepted in North American, Japanese, and Canadian regulatory jurisdictions when it was in production. For a repair bench, a UL-recognized replacement from another manufacturer is the safe swap; the scorch mark on the board tells you the original failed as designed. ## Temperature range and board-fit note The Tape & Reel packaging is the original production format; surplus lots may arrive in cut tape or loose tubes.","metaTitle":"Littelfuse 045101.6MR NANO² 451 Fuse, 1.6A, 125V, Fast Blow","metaDescription":"Littelfuse 045101.6MR NANO² 451 SMD fuse, 1.6A, 125V AC/DC, fast blow. Obsolete — sourced to order against an RFQ through independent distribution.","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":"1.06","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":"0.058 Ohms","Voltage Rating - AC":"125 V","Voltage Rating - DC":"125 V","Current Rating (Amps)":"1.6 A","Operating Temperature":"-55°C ~ 125°C","Breaking Capacity @ Rated Voltage":"50A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.5300","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/2e33e7b2503f3f5110226be89402b64a.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Where can I buy the 045101.6MR?","answer":"Because it is obsolete, stock is lot-specific and confirmed at quote time. Submit an RFQ for current availability and pricing."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/littelfuse-inc/045101.6MR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/littelfuse-inc/045101.6MR 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}}