{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"1206L300SLWR","brand":"Littelfuse Inc.","brandSlug":"littelfuse-inc","productSlug":"1206L300SLWR","canonicalUrl":"https://icboms.com/littelfuse-inc/1206L300SLWR","factsUrl":"https://icboms.com/api/mcp/products/1206L300SLWR","rawCanonicalId":null},"summary":{"shortDescription":"Littelfuse Inc. POLY-FUSE®, LoRho series, Polymeric PTC resettable fuse, 1206L300SLWR, 3 A hold, 6 V max, 50 A max, 1206 (3216 Metric) concave package, surface mount.","salesMarkdown":"## Overcurrent protection for tight board spaces The Littelfuse 1206L300SLWR is a polymeric PTC resettable fuse from the POLY-FUSE LoRho series, designed to protect low-voltage power rails in compact surface-mount designs. It holds 3 A continuously and trips within 4 seconds under fault conditions, resetting automatically once power is removed and the device cools. Rated for a maximum voltage of 6 V and a maximum fault current of 50 A, this part is suited for USB ports, battery packs, and handheld electronics where a short circuit could otherwise damage the upstream regulator or connector. ## Low resistance keeps power loss minimal Initial resistance is just 3 mOhms minimum, rising to 20 mOhms maximum after a trip event. The 1206 concave package (3.25 mm x 1.65 mm footprint, 1.00 mm max thickness) fits standard pick-and-place assembly and reflow profiles. Operating temperature range is -40°C to 85°C, covering most indoor and portable equipment environments. Safety approvals from cURus and TUV mean the part is accepted in equipment sold into North American and European markets without additional component-level certification. ## Obsolete — sourcing through independent channels Littelfuse has marked the 1206L300SLWR as Obsolete. The LoRho series is known for low internal resistance, so a replacement candidate should match the 3 A hold current, 6 V max rating, and 1206 footprint. Verify the initial resistance and post-trip resistance against the design's voltage-drop budget before substituting.","metaTitle":"Littelfuse 1206L300SLWR PTC Resettable Fuse, 3A Hold, 6V","metaDescription":"Littelfuse 1206L300SLWR POLY-FUSE LoRho PTC, 3A hold, 6V max, 50A max. Obsolete — sourced to order. cURus, TUV. RFQ for availability.","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":"4 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)":"0.039\\\" (1.00mm)","lifecycle_stage":"unknown","Size / Dimension":"0.128\\\" L x 0.065\\\" W (3.25mm x 1.65mm)","Current - Trip (It)":"6 A","Height - Seated (Max)":"-","Operating Temperature":"-40°C ~ 85°C","Current - Hold (Ih) (Max)":"3 A","Resistance - Initial (Ri) (Min)":"3 mOhms","Resistance - Post Trip (R1) (Max)":"20 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":"Where can I buy the 1206L300SLWR and get a price?","answer":"Submit a request for quote — current pricing and available quantities are confirmed at that time. No stock-holding or price is listed here."},{"question":"What is the hold current and trip current of the 1206L300SLWR?","answer":"Hold current (Ih) is 3 A maximum. Trip current (It) is 6 A. The device will start to trip above 3 A and is guaranteed to trip at 6 A within 4 seconds."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/littelfuse-inc/1206L300SLWR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/littelfuse-inc/1206L300SLWR 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}}