{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"1206SFF200F/63-2","brand":"Littelfuse Inc.","brandSlug":"littelfuse-inc","productSlug":"1206SFF200F-63-2","canonicalUrl":"https://icboms.com/littelfuse-inc/1206SFF200F-63-2","factsUrl":"https://icboms.com/api/mcp/products/1206SFF200F%2F63-2","rawCanonicalId":null},"summary":{"shortDescription":"Littelfuse SFF series, Board Mount (Cartridge Style Excluded) fuse, 1206SFF200F/63-2, 2 A, 63 V DC, Fast Blow, 1206 (3216 Metric), Surface Mount, UL recognized.","salesMarkdown":"## Obsolete SFF 2A fast-blow — what the specs mean for a replacement search The 1206SFF200F/63-2 is a Littelfuse SFF series 2 A fast-blow surface-mount fuse in a 1206 (3216 metric) package, rated at 63 V DC with a breaking capacity of 50 A at rated voltage. ## Parametric fit — current, voltage, and I²t Rated 2 A continuous at 63 V DC with a 50 A interrupting rating — this is the fault current the fuse can safely clear at rated voltage without rupturing the 1206 ceramic body. Melting I²t is 0.07 — the energy needed to open the element. This governs inrush withstand: a capacitor bank or motor start that dumps more than 0.07 A²s will nuisance-blow the fuse unless the pulse is shorter than the pre-arcing time. DC cold resistance is 0.05 Ohms — the voltage drop at 2 A is 0.1 V, negligible in a 63 V rail but worth checking if the load is a low-voltage (<5 V) bus where every millivolt of IR drop matters. At 125°C ambient the 2 A rating drops to roughly 1.6 A. UL recognized — the fuse meets UL 248-14 for supplemental overcurrent protection. This is the approval that matters for a UL 508A panel or a UL 60950-1 power supply BOM. ## Sourcing an obsolete 1206 fast-blow Obsolete from Littelfuse — no factory lead time or authorized stock. A BOM replacement will require qualification of a different Littelfuse series (e.g., 1206SFS or 1206SFV) or a competitor's 1206 fast-blow with matching 2 A, 63 V DC, 50 A interrupting rating, and ≤0.05 Ohm cold resistance.","metaTitle":"1206SFF200F/63-2 Littelfuse SFF 2A 63V Fast Blow Fuse","metaDescription":"Littelfuse 1206SFF200F/63-2 SFF series, 2A, 63V DC, fast blow surface mount fuse. Obsolete — sourced to order against RFQ. UL recognized.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Obsolete","categoryPath":["Circuit Protection"],"specifications":{"Mfr":"Littelfuse Inc.","Color":"-","Series":"SFF","Package":"Tape & Reel (TR) Cut Tape (CT)","Fuse Type":"Board Mount (Cartridge Style Excluded)","Melting I²t":"0.07","Mounting Type":"Surface Mount","Response Time":"Fast Blow","Package / Case":"1206 (3216 Metric)","Product Status":"Obsolete","Approval Agency":"UL","lifecycle_stage":"unknown","Size / Dimension":"0.126\\\" L x 0.063\\\" W x 0.043\\\" H (3.20mm x 1.60mm x 1.10mm)","DC Cold Resistance":"0.05 Ohms","Voltage Rating - DC":"63 V","Current Rating (Amps)":"2 A","Operating Temperature":"-55°C ~ 125°C","Breaking Capacity @ Rated Voltage":"50A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.6700","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/8939cf38a5e3035b0d6c6bedcc1d525b.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the closest alternative to 1206SFF200F/63-2?","answer":"No pin-compatible direct replacement exists from Littelfuse. A functional substitute requires a 1206 package, 2 A rating, 63 V DC minimum, fast-blow response, and UL recognition — the cold resistance and I²t must match the circuit's inrush profile. Qualification testing is recommended."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/littelfuse-inc/1206SFF200F-63-2","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/littelfuse-inc/1206SFF200F-63-2 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}}