{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"0603L003/36YR-A","brand":"Littelfuse Inc.","brandSlug":"littelfuse-inc","productSlug":"0603L003-36YR-A","canonicalUrl":"https://icboms.com/littelfuse-inc/0603L003-36YR-A","factsUrl":"https://icboms.com/api/mcp/products/0603L003%2F36YR-A","rawCanonicalId":null},"summary":{"shortDescription":"Littelfuse POLY-FUSE® 0603L series, polymeric PTC resettable fuse, 0603 (1608 Metric) concave package, 30 mA hold current, 36 V max, 1 s trip time, surface mount.","salesMarkdown":"## Active production, 30 mA hold — a fit check for 36V rails The 0603L003/36YR-A: Its 30 mA hold current (Ih) at 36 V max means it passes normal circuit current up to that point without tripping; once the fault current reaches 90 mA (It), the PTC heats and transitions to a high-resistance state in typically 1 second, protecting downstream components. ## 0603 footprint, concave termination — board-fit note Initial series resistance is 6 Ohms minimum, rising to 50 Ohms maximum after a trip event — the post-trip resistance adds a voltage drop that keeps the PTC latched until power is cycled, so the circuit sees a clean open-circuit condition during fault. ## Approvals and temperature range Carries cURus and TUV agency approvals — accepted in North American and European equipment without additional component-level review for the safety agency file.","metaTitle":"Littelfuse 0603L003/36YR-A PTC Resettable Fuse, 30mA Hold","metaDescription":"Littelfuse 0603L003/36YR-A polymeric PTC resettable fuse, 30 mA hold current, 36V max, 0603 SMD package. Active production, cURus/TUV approved. Quoted 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®, 0603L","Package":"Tape & Reel (TR) Cut Tape (CT)","Ratings":"-","Lead Spacing":"-","Time to Trip":"1 s","Current - Max":"40 A","Mounting Type":"Surface Mount","Voltage - Max":"36V","Package / Case":"0603 (1608 Metric), Concave","Product Status":"Active","Approval Agency":"cURus, TUV","Thickness (Max)":"0.039\\\" (1.00mm)","lifecycle_stage":"unknown","Size / Dimension":"0.063\\\" L x 0.031\\\" W (1.60mm x 0.80mm)","Current - Trip (It)":"90 mA","Height - Seated (Max)":"-","Operating Temperature":"-40°C ~ 85°C","Current - Hold (Ih) (Max)":"30 mA","Resistance - Initial (Ri) (Min)":"6 Ohms","Resistance - Post Trip (R1) (Max)":"50 Ohms"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$2.1900","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/e4b6b6d09813d8b80152762a3dffab34.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What does the 30 mA hold current mean for my circuit?","answer":"The 30 mA hold current (Ih) is the maximum steady-state current the PTC passes without tripping at 25°C. Above that, once the fault current reaches 90 mA (It), the device trips in typically 1 second. At elevated temperatures the hold current derates, so a 30 mA circuit at 85°C may see the PTC trip on normal current — check the derating curve in the datasheet for your ambient."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/littelfuse-inc/0603L003-36YR-A","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/littelfuse-inc/0603L003-36YR-A 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}}