{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"0603L100SLYR","brand":"Littelfuse Inc.","brandSlug":"littelfuse-inc","productSlug":"0603L100SLYR","canonicalUrl":"https://icboms.com/littelfuse-inc/0603L100SLYR","factsUrl":"https://icboms.com/api/mcp/products/0603L100SLYR","rawCanonicalId":null},"summary":{"shortDescription":"Littelfuse Inc. POLY-FUSE®, LoRho series PTC Resettable Fuse, Type Polymeric, 0603 (1608 Metric) Concave package, 1 A hold current, 6 V max, 50 A max, 300 ms trip time.","salesMarkdown":"## PTC resettable fuse for tight board layouts The Littelfuse 0603L100SLYR is a polymeric PTC resettable fuse from the POLY-FUSE LoRho series, housed in a 0603 (1608 Metric) concave surface-mount package. It holds 1 A continuously and trips at 1.8 A within 300 ms, protecting downstream circuitry from overcurrent faults without needing a fuse replacement. ## Hold current and trip performance Rated for a maximum voltage of 6 V and a maximum interrupt current of 50 A, the 0603L100SLYR fits low-voltage rail protection in portable and battery-powered gear. The 1 A hold current (Ih) at 25 °C ambient means the device stays low-resistance below that threshold; once the fault current exceeds 1.8 A (It), the PTC heats up and switches to a high-resistance state within 300 ms, limiting the current to a safe level. Initial resistance (Ri) is a minimum of 40 mOhms, rising to a maximum of 120 mOhms after tripping (R1). The low initial resistance minimizes voltage drop and power loss during normal operation, which is critical in 6 V rails where every milliohm counts. ## Package and board integration The 0603 (1608 Metric) concave package measures 1.60 mm x 0.80 mm with a maximum seated height of 0.75 mm, making it suitable for dense surface-mount assemblies. Operating temperature range is -40 °C to 85 °C, covering most commercial and industrial indoor environments. ## Approvals and compliance The device carries cURus and TUV approvals, confirming it meets North American and international safety standards for overcurrent protection components.","metaTitle":"0603L100SLYR Littelfuse PTC Resettable Fuse, 1A Hold, 6V Max","metaDescription":"0603L100SLYR Littelfuse POLY-FUSE LoRho PTC resettable fuse, 1A hold current, 6V max, 300ms trip time. 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":"300 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)":"1.8 A","Height - Seated (Max)":"-","Operating Temperature":"-40°C ~ 85°C","Current - Hold (Ih) (Max)":"1 A","Resistance - Initial (Ri) (Min)":"40 mOhms","Resistance - Post Trip (R1) (Max)":"120 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 0603L100SLYR and how do I get a price?","answer":"The 0603L100SLYR is available to order through independent distribution."},{"question":"What is the hold current and trip current of 0603L100SLYR?","answer":"The hold current (Ih) is 1 A, and the trip current (It) is 1.8 A. At 25 °C, the device will trip within 300 ms when the current exceeds 1.8 A."},{"question":"What compliance documentation does Littelfuse provide for 0603L100SLYR?","answer":"The 0603L100SLYR is approved by cURus and TUV, indicating compliance with UL and IEC safety standards for polymeric PTC fuses. RoHS and REACH compliance documentation is typically available from the manufacturer."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/littelfuse-inc/0603L100SLYR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/littelfuse-inc/0603L100SLYR 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}}