{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"1206L400SL-SYR","brand":"Littelfuse Inc.","brandSlug":"littelfuse-inc","productSlug":"1206L400SL-SYR","canonicalUrl":"https://icboms.com/littelfuse-inc/1206L400SL-SYR","factsUrl":"https://icboms.com/api/mcp/products/1206L400SL-SYR","rawCanonicalId":null},"summary":{"shortDescription":"Littelfuse Inc. LoRho Surface Mount PTC Resettable Fuse, Type Polymeric, 1206L400SL-SYR, 4A Hold, 6V Max, 1206 (3216 Metric) Concave Package.","salesMarkdown":"## 4 A hold, 6 V max — the LoRho PTC for tight spots The 1206L400SL-SYR: It holds 4 A continuously (Ih) and trips at 8 A (It) within 2 seconds, with a maximum interrupt rating of 50 A at 6 VDC — sized for low-voltage power rails in portable or battery-backed equipment. ## Low on-resistance keeps the rail clean Initial resistance (Ri) is 1 mOhm minimum, and post-trip resistance (R1) rises to 14 mOhm maximum — the LoRho series minimises voltage drop and I²R heating in the hold state, which matters when the load draws close to the 4 A threshold. Approved under cURus and TUV — the part carries agency marks for North American and European equipment safety reviews. ## Obsolete — plan your last-time-buy or cross-reference Littelfuse has marked the 1206L400SL-SYR as Obsolete. No official successor order code is recorded in the lifecycle data.","metaTitle":"Littelfuse 1206L400SL-SYR PTC Resettable Fuse, 4A Hold, 6V","metaDescription":"Littelfuse 1206L400SL-SYR LoRho PTC resettable fuse, 4A hold, 6V max, 2s trip. Obsolete — sourced to order. cURus, TUV approved.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Obsolete","categoryPath":["Circuit Protection"],"specifications":{"Mfr":"Littelfuse Inc.","Type":"Polymeric","Series":"LoRho Surface Mount","Package":"Tape & Reel (TR)","Ratings":"-","Lead Spacing":"-","Time to Trip":"2 s","Current - Max":"50 A","Mounting Type":"Surface Mount","Voltage - Max":"6V","Package / Case":"1206 (3216 Metric), Concave","Product Status":"Obsolete","Approval Agency":"cURus, TUV","Thickness (Max)":"0.055\\\" (1.40mm)","lifecycle_stage":"unknown","Size / Dimension":"0.126\\\" L x 0.065\\\" W (3.20mm x 1.65mm)","Current - Trip (It)":"8 A","Height - Seated (Max)":"-","Operating Temperature":"-40°C ~ 85°C","Current - Hold (Ih) (Max)":"4 A","Resistance - Initial (Ri) (Min)":"1 mOhms","Resistance - Post Trip (R1) (Max)":"14 mOhms"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/ba263e768b43be9aa2568c602b905b30.pdf","sourceUrl":null},"ai":{"faq":[{"question":"How can I get pricing and availability for 1206L400SL-SYR?","answer":"Submit an RFQ through this listing."},{"question":"What is the closest pin-compatible alternative to 1206L400SL-SYR?","answer":"No official successor or pin-compatible cross-reference is recorded in the lifecycle data. A parametric search for a 1206 LoRho PTC with 4 A hold and 6 V max may yield functional equivalents, but board-level qualification is recommended."},{"question":"What compliance documentation does Littelfuse provide for 1206L400SL-SYR?","answer":"The part carries cURus and TUV agency approvals."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/littelfuse-inc/1206L400SL-SYR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/littelfuse-inc/1206L400SL-SYR 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}}