{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"1206L450/12SLWR","brand":"Littelfuse Inc.","brandSlug":"littelfuse-inc","productSlug":"1206L450-12SLWR","canonicalUrl":"https://icboms.com/littelfuse-inc/1206L450-12SLWR","factsUrl":"https://icboms.com/api/mcp/products/1206L450%2F12SLWR","rawCanonicalId":null},"summary":{"shortDescription":"Littelfuse Inc. Lo Rho Series Polymeric PTC Resettable Fuse, Type Polymeric, 1206 (3216 Metric) Concave Surface Mount, 4.5 A Hold, 12 V, 50 A Max, 2 s Trip Time.","salesMarkdown":"## Hold current and trip behaviour The 1206L450/12SLWR is a Littelfuse Lo Rho polymeric PTC resettable fuse, rated to hold 4.5 A continuously at 12 V. When a fault pushes current past the 9 A trip threshold, the PTC element heats and its resistance jumps, limiting the fault to 50 A max. The trip time is 2 s at the rated fault current — fast enough to protect a 12 V rail feeding a USB port or a sensor cluster without nuisance tripping on inrush. ## Low-resistance Lo Rho series The Lo Rho series is built for low internal resistance: initial resistance is 3 mOhms minimum, and post-trip resistance stays at 14 mOhms maximum. That sub-10 mOhm typical path means the fuse drops under 50 mV at 4.5 A continuous load — negligible for a 12 V bus and critical for keeping the downstream regulator input voltage above dropout. ## 1206 SMD footprint and approvals The concave termination profile suits standard reflow profiles and allows visual inspection of the solder joint. cURus and TUV approvals cover the safety certification for the end equipment. Littelfuse lists the 1206L450/12SLWR as Active in its product lifecycle.","metaTitle":"Littelfuse 1206L450/12SLWR PTC Resettable Fuse, 4.5 A","metaDescription":"Littelfuse 1206L450/12SLWR Lo Rho polymeric PTC resettable fuse, 4.5 A hold, 12 V, 1206 SMD. Active production, cURus/TUV approved. Request a quote.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Circuit Protection"],"specifications":{"Mfr":"Littelfuse Inc.","Type":"Polymeric","Series":"Lo Rho","Package":"Tape & Reel (TR) Cut Tape (CT)","Ratings":"-","Lead Spacing":"-","Time to Trip":"2 s","Current - Max":"50 A","Mounting Type":"Surface Mount","Voltage - Max":"12V","Package / Case":"1206 (3216 Metric), Concave","Product Status":"Active","Approval Agency":"cURus, TUV","Thickness (Max)":"0.063\\\" (1.60mm)","lifecycle_stage":"unknown","Size / Dimension":"0.126\\\" L x 0.065\\\" W (3.20mm x 1.65mm)","Current - Trip (It)":"9 A","Height - Seated (Max)":"-","Operating Temperature":"-40°C ~ 85°C","Current - Hold (Ih) (Max)":"4.5 A","Resistance - Initial (Ri) (Min)":"3 mOhms","Resistance - Post Trip (R1) (Max)":"14 mOhms"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$2.1900","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/ba263e768b43be9aa2568c602b905b30.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Where can I buy the 1206L450/12SLWR and get a price?","answer":"This part is sourced through authorized distribution channels. Submit an RFQ with your target quantity; we confirm availability and current pricing at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/littelfuse-inc/1206L450-12SLWR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/littelfuse-inc/1206L450-12SLWR 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}}