{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"0451.160MRSN","brand":"Littelfuse Inc.","brandSlug":"littelfuse-inc","productSlug":"0451.160MRSN","canonicalUrl":"https://icboms.com/littelfuse-inc/0451.160MRSN","factsUrl":"https://icboms.com/api/mcp/products/0451.160MRSN","rawCanonicalId":null},"summary":{"shortDescription":"Littelfuse Inc. NANO²® 451 series, Board Mount Surface Mount Fuse, 0451.160MRSN, 160 mA, 125 VAC, Fast Blow, 2-SMD Square End Block package, Tape & Reel.","salesMarkdown":"## What the 160 mA rating means on a board-level fault The 0451.160MRSN is a Littelfuse NANO²® 451 series surface-mount fuse rated 160 mA at 125 VAC, with a fast-blow response time. At that current, the 50 A breaking capacity at rated voltage means it can safely interrupt a short-circuit fault up to 50 A without the fuse body rupturing or arcing across the SMD pads — critical for secondary-side protection on a control transformer or a DC rail feeding sensitive logic. The melting I²t of 0.0048 A²s tells you how much energy the fuse absorbs before opening. For a 160 mA rail, a downstream capacitor bank charging inrush that exceeds this I²t will nuisance-blow the fuse on power-up — so if the board has a bulk cap over a few hundred microfarads, you may need a slow-blow variant in the same footprint. The DC cold resistance of 1.2157 Ω at room temperature means the fuse drops about 190 mV at rated current — negligible for a 5 V or 12 V rail, but worth checking if the load is a 3.3 V sensor drawing close to the fuse rating. Housed in a 2-SMD square end block package measuring 6.10 mm x 2.69 mm x 2.69 mm, the 0451.160MRSN sits flush on the PCB with no through-hole leads. The square end terminations are the same width as the body, so the solder pad footprint is straightforward — no special stencil aperture needed for a standard reflow profile. The cold resistance quoted at room temperature shifts with temperature, but the fuse element's opening characteristic stays within the fast-blow band across the full range. Supplied on Tape & Reel (TR) — pick-and-place ready for volume assembly. The reel quantity is standard for the NANO² 451 series; confirm the reel count with your distributor at quote time. ## Approvals and compliance Carries CSA and UR approval agency marks — accepted for North American equipment listings.","metaTitle":"Littelfuse 0451.160MRSN NANO² 451 SMD Fuse, 160 mA, 125 VAC","metaDescription":"Littelfuse 0451.160MRSN NANO² 451 surface mount fuse, 160 mA, 125 VAC, fast blow, 50 A breaking capacity. Active production, sourced to order. Request a quote.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Circuit Protection"],"specifications":{"Mfr":"Littelfuse Inc.","Color":"-","Series":"NANO²® 451","Package":"Tape & Reel (TR)","Fuse Type":"Board Mount (Cartridge Style Excluded)","Melting I²t":"0.0048","Mounting Type":"Surface Mount","Response Time":"Fast Blow","Package / Case":"2-SMD, Square End Block","Product Status":"Active","Approval Agency":"CSA, UR","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":"1.2157 Ohms","Voltage Rating - AC":"125 V","Current Rating (Amps)":"160 mA","Operating Temperature":"-55°C~125°C","Breaking Capacity @ Rated Voltage":"50A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.4469","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/604a0e4c498aa97d2607992508357d04.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/0451.160MRSN/alternatives.json"},"ai":{"faq":[{"question":"How do I get current pricing and availability for 0451.160MRSN?","answer":"Submit an RFQ through this listing. Pricing and lead time are confirmed at quote time based on your quantity and delivery window."},{"question":"What is the closest pin-compatible alternative to 0451.160MRSN in this Circuit Protection family?","answer":"The NANO² 451 series includes multiple current ratings in the same 2-SMD square end block footprint. A direct pin-compatible swap at a different current rating (e.g., 200 mA or 125 mA) shares the same package and pad layout — only the fuse element and I²t change. No single closest alternative is designated; the replacement depends on the circuit's overcurrent requirement."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/littelfuse-inc/0451.160MRSN","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/littelfuse-inc/0451.160MRSN when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:49:49.435Z","lastPublished":"2026-08-11T15:49:49.435Z","indexable":true}}