{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"1206L380SLWR","brand":"Littelfuse Inc.","brandSlug":"littelfuse-inc","productSlug":"1206L380SLWR","canonicalUrl":"https://icboms.com/littelfuse-inc/1206L380SLWR","factsUrl":"https://icboms.com/api/mcp/products/1206L380SLWR","rawCanonicalId":null},"summary":{"shortDescription":"Littelfuse Inc. POLY-FUSE®, LoRho series PTC resettable fuse, Type Polymeric, 1206 (3216 Metric) Concave package, 3.8 A hold, 6 V max, 50 A max, Tape & Reel.","salesMarkdown":"## What the hold current and voltage ceiling mean for your rail The 1206L380SLWR is a Littelfuse POLY-FUSE LoRho series polymeric PTC resettable fuse, rated for a 3.8 A hold current (Ih) at 6 V max. The 50 A max fault current rating tells you it can interrupt a short-circuit current up to that level without rupturing the package. The 3.8 A hold current is the steady-state current the part will pass without tripping at 25 °C ambient. Above that, the internal resistive heating raises the polymer temperature until it switches to a high-resistance state, typically within 3 seconds at 8 A (It). Once the fault clears and power is removed, it resets — no fuse replacement needed. ## Resistance values and the LoRho advantage Initial resistance (Ri) is 2 mOhms minimum, and post-trip resistance (R1) maxes out at 16 mOhms. The LoRho series is designed for lower resistance than standard PTCs — the 2 mOhm floor means the voltage drop at 3.8 A is under 8 mV, which keeps I²R losses negligible on a 6 V rail. That matters when you are trying to avoid a voltage sag on a USB VBUS line or a battery protection circuit. The 1206 (3216 metric) concave package is surface-mount, 3.25 mm x 1.65 mm, with a max thickness of 0.70 mm. That footprint is standard for medium-current PTCs — the concave termination allows visual solder-joint inspection after reflow. Operating temperature range is -40 °C to 85 °C, covering most indoor and outdoor consumer/industrial environments. ## Lifecycle reality — obsolete, sourced through surplus Littelfuse lists the 1206L380SLWR as obsolete. That means new designs should look at current POLY-FUSE offerings in the same 1206 footprint and similar hold-current range, but the BOM line for an existing board must be filled through independent distribution or surplus channels. The part carries cURus and TUV approvals, so it was qualified for North American and European safety standards when active. Those approvals are still valid for the existing stock — no recertification needed for repair or replacement runs.","metaTitle":"Littelfuse 1206L380SLWR PTC Resettable Fuse, 3.8A Hold, 6V","metaDescription":"Littelfuse 1206L380SLWR POLY-FUSE LoRho PTC resettable fuse, 3.8A hold current, 6V max, 50A max fault current. 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":"POLY-FUSE®, LoRho","Package":"Tape & Reel (TR) Cut Tape (CT)","Ratings":"-","Lead Spacing":"-","Time to Trip":"3 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)":"0.028\\\" (0.70mm)","lifecycle_stage":"unknown","Size / Dimension":"0.128\\\" L x 0.065\\\" W (3.25mm x 1.65mm)","Current - Trip (It)":"8 A","Height - Seated (Max)":"-","Operating Temperature":"-40°C ~ 85°C","Current - Hold (Ih) (Max)":"3.8 A","Resistance - Initial (Ri) (Min)":"2 mOhms","Resistance - Post Trip (R1) (Max)":"16 mOhms"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.8500","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/ba263e768b43be9aa2568c602b905b30.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the closest alternative to the 1206L380SLWR?","answer":"For a new design, look at current POLY-FUSE LoRho series parts in the 1206 package with a similar 3.8 A hold current and 6 V voltage rating. The exact pin-compatible replacement depends on the board's hold-current and trip-time requirements — confirm the parametric match before committing."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/littelfuse-inc/1206L380SLWR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/littelfuse-inc/1206L380SLWR 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}}