{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"1206SFP450F/32-2","brand":"Littelfuse Inc.","brandSlug":"littelfuse-inc","productSlug":"1206SFP450F-32-2","canonicalUrl":"https://icboms.com/littelfuse-inc/1206SFP450F-32-2","factsUrl":"https://icboms.com/api/mcp/products/1206SFP450F%2F32-2","rawCanonicalId":null},"summary":{"shortDescription":"Littelfuse SFP series board mount fuse, 1206SFP450F/32-2, 4.5 A, 32 VDC, 50 A breaking capacity, 1206 (3216 Metric) SMD package, UL approved.","salesMarkdown":"## Fuse ratings and protection profile The 1206SFP450F/32-2: Rated 4.5 A at 32 VDC, this Littelfuse SFP series fuse provides overcurrent protection in a 1206 SMD package. The 50 A breaking capacity at rated voltage means it can safely interrupt a fault current up to that level without rupturing or sustaining an arc — a key parameter for DC bus protection where the available short-circuit current may be high. The melting I²t of 3.2 defines the energy required to open the fuse element. This value is used for fuse coordination — selecting a fuse that opens before downstream components exceed their surge ratings, and after upstream protection devices to avoid nuisance tripping. DC cold resistance is 0.021 Ohms. At 4.5 A, the I²R loss is under half a watt — negligible for most PCB layouts, but the trace width to the pads should be sized for the full load current plus margin. ## Obsolete part — sourcing through independent channels The 1206SFP450F/32-2 is listed as Obsolete by Littelfuse. This means the manufacturer has discontinued production and there is no last-time-buy window remaining. For a BOM sustainment decision, a parametric search for a 4.5 A, 32 VDC, 1206 SMD fuse with similar I²t and breaking capacity is the practical path. The UL approval on this part means any replacement should also carry UL recognition for the same regulatory acceptance. ## Board-level integration and temperature range The tape-and-reel packaging (Cut Tape also available) suits pick-and-place assembly. Standard reflow profiles for 1206 chip fuses apply; the solder pad layout follows the IPC-7351 standard for this footprint. Operating temperature range spans -55°C to 125°C. This covers the full industrial temperature band and extends into automotive under-hood environments — the fuse element and housing materials are rated for continuous exposure at the upper limit without derating the current.","metaTitle":"Littelfuse 1206SFP450F/32-2 SFP Fuse, 4.5 A, 32 VDC, 1206","metaDescription":"Littelfuse 1206SFP450F/32-2 SFP series fuse, 4.5 A, 32 VDC, 50 A breaking capacity, UL approved, 1206 SMD. 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":"SFP","Package":"Tape & Reel (TR) Cut Tape (CT)","Fuse Type":"Board Mount (Cartridge Style Excluded)","Melting I²t":"3.2","Mounting Type":"Surface Mount","Response Time":"-","Package / Case":"1206 (3216 Metric)","Product Status":"Obsolete","Approval Agency":"UL","lifecycle_stage":"unknown","Size / Dimension":"0.126\\\" L x 0.063\\\" W x 0.038\\\" H (3.20mm x 1.60mm x 0.97mm)","DC Cold Resistance":"0.021 Ohms","Voltage Rating - DC":"32 V","Current Rating (Amps)":"4.5 A","Operating Temperature":"-55°C ~ 125°C","Breaking Capacity @ Rated Voltage":"50A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.9400","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/8939cf38a5e3035b0d6c6bedcc1d525b.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the breaking capacity of 1206SFP450F/32-2?","answer":"50 A at the rated 32 VDC. This is the maximum fault current the fuse can safely interrupt without rupturing or sustaining an arc — critical for DC circuit protection where the available short-circuit current may be high."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/littelfuse-inc/1206SFP450F-32-2","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/littelfuse-inc/1206SFP450F-32-2 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}}