{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"0451.375MR","brand":"Littelfuse Inc.","brandSlug":"littelfuse-inc","productSlug":"0451.375MR","canonicalUrl":"https://icboms.com/littelfuse-inc/0451.375MR","factsUrl":"https://icboms.com/api/mcp/products/0451.375MR","rawCanonicalId":null},"summary":{"shortDescription":"Littelfuse NANO²® 451 series, surface-mount fast-blow fuse, 0451.375MR, 375 mA, 125 V AC/DC, 50 A breaking capacity, 2-SMD square end block package, Tape & Reel.","salesMarkdown":"## Obsolete — sourcing through independent channels Littelfuse has marked the 0451.375MR as obsolete, meaning the manufacturer no longer produces it as a standard catalog item. ## Key ratings for board-level protection Rated 375 mA at 125 V AC or DC, this fast-blow fuse clears overcurrents quickly — the 0.0425 melting I²t means it opens fast enough to protect downstream silicon from short-duration fault energy. Breaking capacity is 50 A at the rated voltage — sufficient for most low-power secondary-side circuits; the fuse interrupts a fault without rupturing or sustaining an arc. The 0.61 Ohm cold resistance helps predict voltage drop at rated current — about 230 mV across the fuse at 375 mA, which matters for low-voltage rails. Housed in a 2-SMD square end block package measuring 6.10 mm x 2.69 mm x 2.69 mm, it sits flat on the pad with no tombstoning risk — the end-cap terminations are symmetrical. Surface-mount on a standard 2-SMD footprint; the Tape & Reel packaging feeds directly into a pick-and-place machine for high-volume assembly.","metaTitle":"Littelfuse 0451.375MR NANO² 451 Fuse, 375 mA, 125 V","metaDescription":"Littelfuse 0451.375MR NANO² 451 surface-mount fuse, 375 mA, 125 V AC/DC, fast-blow, 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":"0.0425","Mounting Type":"Surface Mount","Response Time":"Fast Blow","Package / Case":"2-SMD, Square End Block","Product Status":"Obsolete","Approval Agency":"CSA, 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":"0.61 Ohms","Voltage Rating - AC":"125 V","Voltage Rating - DC":"125 V","Current Rating (Amps)":"375 mA","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":"How can I order the 0451.375MR or check availability?","answer":"The 0451.375MR is obsolete and sourced through independent distribution."},{"question":"What approvals does the 0451.375MR carry?","answer":"It is approved by CSA and UL, which covers North American regulatory acceptance for board-level fuses."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/littelfuse-inc/0451.375MR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/littelfuse-inc/0451.375MR 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}}