{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"0603L050YR","brand":"Littelfuse Inc.","brandSlug":"littelfuse-inc","productSlug":"0603L050YR","canonicalUrl":"https://icboms.com/littelfuse-inc/0603L050YR","factsUrl":"https://icboms.com/api/mcp/products/0603L050YR","rawCanonicalId":null},"summary":{"shortDescription":"Littelfuse POLY-FUSE® 0603L series, Polymeric PTC Resettable Fuse, 0603 (1608 Metric) Concave package, 500 mA hold current, 6 V max, 40 A max interrupt, Tape & Reel.","salesMarkdown":"## 0603 footprint, 500 mA hold — the board-protection fit The 0603L050YR: Its 500 mA hold current (Ih) at 25 °C defines the maximum steady-state load the fuse passes without tripping — above that threshold, the polymer heats and the device switches to a high-resistance state, limiting current to protect the downstream circuit. The trip current (It) is 1 A, and the device clears a fault in 100 ms typical at that level, fast enough to protect most low-voltage DC rails from sustained overcurrent. ## Voltage and interrupt ceiling — where it fits in the rail Rated for a maximum voltage of 6 V and a maximum interrupt current of 40 A, this PTC is sized for low-voltage DC power distribution — think USB power rails, battery management outputs, or peripheral port protection where the supply stays under 6 V. The initial resistance (Ri) is 100 mOhms minimum, rising to 680 mOhms maximum after a trip event (R1) — the post-trip resistance ceiling means the circuit sees a higher series impedance after a fault, which may need to be factored into the load's minimum operating voltage. ## Active production, cURus and TUV approvals Carries cURus and TUV agency approvals, confirming compliance with UL 1434 and IEC 60738-1 for polymeric PTC overcurrent protectors — a standard requirement for equipment sold into North American and European markets. Supplied in Tape & Reel (TR) or Cut Tape (CT) packaging, matching standard 8 mm carrier tape for 0603 components — compatible with automated pick-and-place assembly without a feeder change.","metaTitle":"Littelfuse 0603L050YR PTC Resettable Fuse, 500mA, 6V","metaDescription":"Littelfuse 0603L050YR POLY-FUSE polymeric PTC resettable fuse, 500 mA hold current, 6 V max, 40 A max interrupt. Active production, cURus/TUV approved.","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®, 0603L","Package":"Tape & Reel (TR) Cut Tape (CT)","Ratings":"-","Lead Spacing":"-","Time to Trip":"100 ms","Current - Max":"40 A","Mounting Type":"Surface Mount","Voltage - Max":"6V","Package / Case":"0603 (1608 Metric), Concave","Product Status":"Active","Approval Agency":"cURus, TUV","Thickness (Max)":"0.061\\\" (1.55mm)","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)":"100 mOhms","Resistance - Post Trip (R1) (Max)":"680 mOhms"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.0300","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/e4b6b6d09813d8b80152762a3dffab34.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Where can I buy 0603L050YR and check availability?","answer":"The 0603L050YR is an active Littelfuse part available through independent and authorized distribution."},{"question":"What is the hold current and trip current of 0603L050YR?","answer":"The hold current (Ih) is 500 mA maximum at 25 °C, and the trip current (It) is 1 A. The device trips in 100 ms typical at the trip current level."},{"question":"What approvals does 0603L050YR carry?","answer":"The part is approved by cURus (UL 1434) and TUV (IEC 60738-1), covering North American and European safety standards for polymeric PTC resettable fuses."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/littelfuse-inc/0603L050YR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/littelfuse-inc/0603L050YR 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}}