{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"0603L050SLYR","brand":"Littelfuse Inc.","brandSlug":"littelfuse-inc","productSlug":"0603L050SLYR","canonicalUrl":"https://icboms.com/littelfuse-inc/0603L050SLYR","factsUrl":"https://icboms.com/api/mcp/products/0603L050SLYR","rawCanonicalId":null},"summary":{"shortDescription":"Littelfuse POLY-FUSE®, LoRho series, PTC resettable fuse, 0603 (1608 Metric) concave surface-mount package, 500 mA hold current, 1 A trip current, 6 V max, 50 A max interrupt.","salesMarkdown":"## 500 mA hold, 1 A trip — the protection threshold and why it matters The 0603L050SLYR holds 500 mA continuously without tripping; above that, at 1 A (the trip current), the internal polymer heats and switches to a high-resistance state, limiting the fault current to a safe level. Initial resistance is a minimum 70 mOhms; after tripping it rises to a maximum 350 mOhms. The low R reduces I²R loss in normal operation — on a 500 mA rail the voltage drop is roughly 35 mV at the start of life. Time to trip is 100 ms — fast enough to protect downstream silicon from sustained overcurrent but slow enough to ignore inrush from a bypass capacitor bank. ## 6 V max, 0603 SMD — where this part fits on the board Rated for 6 V maximum continuous voltage — use it on 3.3 V, 5 V, or battery-protected rails where the rail never exceeds 6 V. The 0603 concave package (1.60 mm x 0.80 mm, 0.75 mm thick) matches the standard 0603 footprint; the concave termination style improves solder-joint reliability under thermal cycling compared to a flat termination. ## Active production, cURus/TUV — sourcing reality Approved by cURus and TUV — accepted in equipment sold into North America and the EU without additional component-level safety testing.","metaTitle":"Littelfuse 0603L050SLYR PTC Resettable Fuse, 500 mA, 6 V","metaDescription":"Littelfuse 0603L050SLYR POLY-FUSE LoRho PTC resettable fuse, 500 mA hold, 1 A trip, 50 A max, 0603 SMD. Active production. cURus/TUV. Request quote.","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":"100 ms","Current - Max":"50 A","Mounting Type":"Surface Mount","Voltage - Max":"6V","Package / Case":"0603 (1608 Metric), Concave","Product Status":"Active","Approval Agency":"cURus, TUV","Thickness (Max)":"0.030\\\" (0.75mm)","lifecycle_stage":"unknown","Size / Dimension":"0.063\\\" L x 0.032\\\" W (1.60mm x 0.80mm)","Current - Trip (It)":"1 A","Height - Seated (Max)":"-","Operating Temperature":"-40°C ~ 85°C","Current - Hold (Ih) (Max)":"500 mA","Resistance - Initial (Ri) (Min)":"70 mOhms","Resistance - Post Trip (R1) (Max)":"350 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 approvals does the 0603L050SLYR carry?","answer":"cURus and TUV — covers UL/CSA-recognized components for North America and IEC/EN compliance for European markets."},{"question":"What is the 0603L050SLYR's type and series?","answer":"It is a Polymeric PTC resettable fuse from the Littelfuse POLY-FUSE LoRho series — a low-resistance formulation for minimal voltage drop on low-voltage power rails."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/littelfuse-inc/0603L050SLYR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/littelfuse-inc/0603L050SLYR 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}}