{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"1206SFF250F/32-2","brand":"Littelfuse Inc.","brandSlug":"littelfuse-inc","productSlug":"1206SFF250F-32-2","canonicalUrl":"https://icboms.com/littelfuse-inc/1206SFF250F-32-2","factsUrl":"https://icboms.com/api/mcp/products/1206SFF250F%2F32-2","rawCanonicalId":null},"summary":{"shortDescription":"Littelfuse Inc. SFF Series, Board Mount Surface Mount Fuse, 1206 (3216 Metric), 2.5 A, 32 VDC, Fast Blow, 50 A Breaking Capacity, UL Recognized.","salesMarkdown":"## 2.5 A fast-blow in a 1206 footprint The Littelfuse 1206SFF250F/32-2 is a 2.5 A fast-blow surface-mount fuse from the SFF series, rated for 32 VDC with a 50 A interrupting capacity at that voltage. The 0.14 melting I²t tells you this fuse opens quickly on a hard short but will tolerate the brief inrush of a 100 µF capacitor bank charging from a 24 V rail — the energy to blow the element is 0.14 A²s, so the pulse must exceed that integral to clear the fuse. The 1206 (3216 Metric) package is the standard footprint for board-mount fuses in this current class, and the 0.037 Ohm DC cold resistance means a 2.5 A load drops about 93 mV and dissipates 230 mW — negligible in most circuits but worth checking if the fuse sits in a tightly regulated 3.3 V rail where every millivolt of headroom matters. ## Obsolete — sourcing through independent channels Littelfuse lists the 1206SFF250F/32-2 as Obsolete. Sourcing this part now runs through independent distribution — surplus inventory, new-old-stock lots, and broker channels. The SFF series is a recognized UL 248-14 supplementary fuse line. The UL approval certifies the design meets the standard for overcurrent protection in equipment where the branch circuit is already protected. For a replacement search, the key parametric anchors are the 2.5 A current rating, 32 VDC voltage, fast-blow response, and the 1206 footprint — any candidate fuse must match these four constraints to drop into the same PCB land pattern and protect the same load. ## Temperature grade and deployment context In a 125°C engine-bay ECU or a -55°C satellite power conditioner, the fuse element's time-current curve shifts with temperature — the datasheet's derating guidance (not reproduced here) should be consulted for the actual trip point at the application's ambient. The 50 A breaking capacity at 32 VDC is adequate for most low-voltage DC power rails; at higher system voltages the interrupting rating may be lower, so confirm the fault current available at the fuse location. The surface-mount 1206 package is a common PCB layout footprint. Tape & Reel packaging is the typical supply format for volume production.","metaTitle":"Littelfuse 1206SFF250F/32-2 SFF Fuse, 2.5 A, 32 VDC","metaDescription":"Littelfuse 1206SFF250F/32-2 SFF series fuse, 2.5 A, 32 VDC, 50 A breaking capacity, fast blow, 1206 SMD.","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":"0.14","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":"0.037 Ohms","Voltage Rating - DC":"32 V","Current Rating (Amps)":"2.5 A","Operating Temperature":"-55°C ~ 125°C","Breaking Capacity @ Rated Voltage":"50A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.9100","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/8939cf38a5e3035b0d6c6bedcc1d525b.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the breaking capacity of the 1206SFF250F/32-2?","answer":"The fuse is rated for 50 A interrupting capacity at its rated voltage of 32 VDC. This means it can safely clear a fault current up to 50 A without rupturing or sustaining an arc. For circuits with higher available fault current, a fuse with a higher interrupting rating is needed."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/littelfuse-inc/1206SFF250F-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/1206SFF250F-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}}