{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"1206SFF175F/63-2","brand":"Littelfuse Inc.","brandSlug":"littelfuse-inc","productSlug":"1206SFF175F-63-2","canonicalUrl":"https://icboms.com/littelfuse-inc/1206SFF175F-63-2","factsUrl":"https://icboms.com/api/mcp/products/1206SFF175F%2F63-2","rawCanonicalId":null},"summary":{"shortDescription":"Littelfuse SFF series, board mount fast-blow fuse, 1206 (3216 metric), 1.75 A, 63 VDC, 50 A breaking capacity, 0.1 Ohms DC cold resistance, UL recognized.","salesMarkdown":"## Obsolete — sourcing the 1206SFF175F/63-2 on the spot market Littelfuse has marked the 1206SFF175F/63-2 as obsolete. No official successor order code is listed, so the only channel is independent surplus and excess inventory. This is a last-time-buy situation: once the remaining stock in the distribution pipeline and on broker shelves is gone, the part is gone. Any BOM that still carries this line item needs a confirmed source now. ## 1.75 A fast-blow in a 1206 footprint — what the ratings mean Rated 1.75 A continuous at 63 VDC, this is a fast-blow fuse — it opens quickly on overcurrent, not on sustained low-level overloads. The 50 A breaking capacity at the rated voltage means it can safely interrupt a fault current up to that level without rupturing the ceramic body. The 0.045 melting I²t is the energy needed to clear the element. For a 1.75 A rail, this is a low I²t value — the fuse responds fast to short-circuit pulses, which matters when protecting a sensitive load that cannot ride through a long arc. DC cold resistance is 0.1 Ohms. At 1.75 A, the resistive voltage drop is 175 mV — negligible for a 63 V rail but worth checking if the load is a low-voltage sensor that sees the fuse drop as a supply sag. ## 1206 footprint and surface-mount integration Standard 1206 (3216 metric) chip footprint, surface-mount. Tape & Reel and Cut Tape packaging — the reel quantity is standard for the SFF series. The UL recognition covers the fuse's safety performance in the end equipment.","metaTitle":"Littelfuse 1206SFF175F/63-2 SFF Fuse, 1.75 A, 63 VDC","metaDescription":"Littelfuse 1206SFF175F/63-2 SFF series surface-mount fast-blow fuse. 1.75 A, 63 VDC, 50 A breaking capacity. 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":"0.045","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":"0.1 Ohms","Voltage Rating - DC":"63 V","Current Rating (Amps)":"1.75 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 closest alternative to 1206SFF175F/63-2 in the SFF family?","answer":"No pin-compatible or functional equivalent is listed as an official successor. The SFF series includes other ratings in the same 1206 footprint, but a different current or voltage rating changes the protection profile — a BOM substitution requires verifying the new fuse's I²t and breaking capacity against the circuit requirements."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/littelfuse-inc/1206SFF175F-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/1206SFF175F-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}}