{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"1206L350SLTHYR","brand":"Littelfuse Inc.","brandSlug":"littelfuse-inc","productSlug":"1206L350SLTHYR","canonicalUrl":"https://icboms.com/littelfuse-inc/1206L350SLTHYR","factsUrl":"https://icboms.com/api/mcp/products/1206L350SLTHYR","rawCanonicalId":null},"summary":{"shortDescription":"Littelfuse Inc. POLY-FUSE®, LoRho series, Type Polymeric PTC resettable fuse, 1206 (3216 Metric) Concave package, 3.5 A hold current, 6 V max, 50 A max fault current, Surface Mount.","salesMarkdown":"## 3.5 A hold in a 1206 footprint The Littelfuse 1206L350SLTHYR is a polymeric PTC resettable fuse from the POLY-FUSE LoRho series, rated to hold 3.5 A continuously at 6 V and trip at 7 A. It clears a fault by heating up and jumping to a high-resistance state, protecting the downstream circuit without needing a fuse replacement after the overcurrent event clears. The 3.5 A hold current in a standard 1206 footprint means it fits into tight USB power ports, battery management paths, and low-voltage DC rails where a traditional fuse would take up more board space and require a holder. ## What the ratings mean on the bench After a trip event, the post-trip resistance climbs to 18 mOhms max, still low enough that the circuit can resume normal operation once the fault is removed and the PTC cools. The trip time is 5 seconds maximum at the rated fault current — this is a slow-blow response, so it will not nuisance-trip on inrush spikes from a capacitor bank or a motor start, but it will clear a sustained short before the downstream silicon sees junction damage. The 50 A maximum fault current rating means it can handle a dead short on a 6 V bus without rupturing. Derate the hold current at the high end of that range — a PTC's trip threshold drops as the ambient temperature rises, so at 85°C the effective hold current is lower than the 25°C rating. ## Package and board-fit The concave termination means the solder fillet wicks up the end of the part, giving a visible inspection point after reflow. Surface-mount only — no through-hole option. The low profile keeps it clear of any enclosure lid or secondary board stacked above. ## Sourcing and compliance Carries cURus and TUV approvals, meaning it is accepted for use in equipment sold into North America and the European Union without additional component-level safety testing.","metaTitle":"Littelfuse 1206L350SLTHYR PTC Resettable Fuse, 3.5A Hold, 6V","metaDescription":"Littelfuse 1206L350SLTHYR POLY-FUSE LoRho PTC resettable fuse, 3.5A hold current, 6V max, 50A fault. Active production. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","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":"5 s","Current - Max":"50 A","Mounting Type":"Surface Mount","Voltage - Max":"6V","Package / Case":"1206 (3216 Metric), Concave","Product Status":"Active","Approval Agency":"cURus, TUV","Thickness (Max)":"0.030\\\" (0.75mm)","lifecycle_stage":"unknown","Size / Dimension":"0.128\\\" L x 0.065\\\" W (3.25mm x 1.65mm)","Current - Trip (It)":"7 A","Height - Seated (Max)":"-","Operating Temperature":"-40°C ~ 85°C","Current - Hold (Ih) (Max)":"3.5 A","Resistance - Initial (Ri) (Min)":"3 mOhms","Resistance - Post Trip (R1) (Max)":"18 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 1206L350SLTHYR and check current pricing?","answer":"The 1206L350SLTHYR is sourced to order against your BOM quantity through independent distribution."},{"question":"What is the 1206L350SLTHYR's hold current and trip current?","answer":"It holds 3.5 A continuously and trips at 7 A. The maximum fault current it can interrupt is 50 A at 6 V."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/littelfuse-inc/1206L350SLTHYR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/littelfuse-inc/1206L350SLTHYR when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:49:49.435Z","lastPublished":"2026-08-11T15:49:49.435Z","indexable":true}}