{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"0603SFP400F/32-2","brand":"Littelfuse Inc.","brandSlug":"littelfuse-inc","productSlug":"0603SFP400F-32-2","canonicalUrl":"https://icboms.com/littelfuse-inc/0603SFP400F-32-2","factsUrl":"https://icboms.com/api/mcp/products/0603SFP400F%2F32-2","rawCanonicalId":null},"summary":{"shortDescription":"Littelfuse Inc. SFP series, board-mount fuse, 0603 (1608 metric), 4 A, 32 VDC, 50 A breaking capacity, surface-mount, tape and reel.","salesMarkdown":"The 0603SFP400F/32-2: Rated 4 A continuous at 32 VDC with a breaking capacity of 50 A at rated voltage — the fuse safely interrupts a fault current up to 50 A without rupturing the 0603 ceramic body. The DC cold resistance is 0.018 Ohms, so the voltage drop at rated current is under 75 mV, keeping power dissipation low in a tight board layout. Melting I²t is 2.63 — this is the energy needed to clear the fuse element. For a downstream DC-DC converter with input capacitors, the inrush current pulse must stay below this I²t threshold to avoid nuisance opens during power-up. The 0603 package (1.60 mm x 0.81 mm x 0.81 mm) fits dense SMT layouts where board space is at a premium. ## Sourcing this obsolete part Because Littelfuse has discontinued the SFP series, no official successor or pin-compatible cross-reference is maintained. No stock-holding claim; sourced per request.","metaTitle":"Littelfuse 0603SFP400F/32-2 SFP Fuse, 4 A 32 V, Obsolete","metaDescription":"Littelfuse 0603SFP400F/32-2 SFP series board-mount fuse, 4 A, 32 VDC, 50A breaking capacity. Obsolete — sourced to order via independent channels.","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":"2.63","Mounting Type":"Surface Mount","Response Time":"-","Package / Case":"0603 (1608 Metric)","Product Status":"Obsolete","Approval Agency":"-","lifecycle_stage":"unknown","Size / Dimension":"0.063\\\" L x 0.032\\\" W x 0.032\\\" H (1.60mm x 0.81mm x 0.81mm)","DC Cold Resistance":"0.018 Ohms","Voltage Rating - DC":"32 V","Current Rating (Amps)":"4 A","Operating Temperature":"-55°C ~ 125°C","Breaking Capacity @ Rated Voltage":"50A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.1700","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/8939cf38a5e3035b0d6c6bedcc1d525b.pdf","sourceUrl":null},"ai":{"faq":[{"question":"How can I order the 0603SFP400F/32-2 or check current stock?","answer":"The 0603SFP400F/32-2 is obsolete but available through independent surplus channels. No stock-holding claim is made on this page."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/littelfuse-inc/0603SFP400F-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/0603SFP400F-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}}