{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"0603L300/9SLYR","brand":"Littelfuse Inc.","brandSlug":"littelfuse-inc","productSlug":"0603L300-9SLYR","canonicalUrl":"https://icboms.com/littelfuse-inc/0603L300-9SLYR","factsUrl":"https://icboms.com/api/mcp/products/0603L300%2F9SLYR","rawCanonicalId":null},"summary":{"shortDescription":"Littelfuse Inc., POLY-FUSE® LoRho series, Polymeric PTC resettable fuse, 0603L300/9SLYR, 3 A hold current, 9 V max, 50 A max fault, 0603 (1608 Metric) concave package, Surface Mount.","salesMarkdown":"## 3 A hold, 9 V max — the resettable overcurrent guard for tight board spaces The Littelfuse 0603L300/9SLYR is a polymeric PTC resettable fuse from the POLY-FUSE® LoRho series, designed to protect low-voltage circuits up to 9 V from overcurrent faults. Its 3 A hold current (Ih) means it passes normal load current up to that level without tripping, while the 6 A trip current (It) defines the threshold where the device switches to a high-resistance state within 1 second (typical time to trip). Rated for a maximum fault current of 50 A, this PTC can safely interrupt short circuits without rupturing, making it suitable for USB port protection, battery pack overcurrent, and general-purpose board-level fault isolation in compact designs. ## Resistance profile and temperature envelope Initial resistance (Ri) is a minimum of 3 mOhms, and post-trip resistance (R1) rises to a maximum of 30 mOhms — the low Ri keeps I²R losses minimal during normal operation, while the post-trip state provides enough impedance to limit fault current to safe levels. The operating temperature range spans -40°C to +85°C, covering typical industrial and consumer environments. ## Sourcing and compliance It carries cURus and TUV approvals, confirming safety certification for North American and European markets. No stock-holding claim; each lot is verified for authenticity and RoHS compliance per the manufacturer's documentation.","metaTitle":"Littelfuse 0603L300/9SLYR PTC Resettable Fuse, 3A Hold, 9V","metaDescription":"Littelfuse 0603L300/9SLYR POLY-FUSE LoRho PTC resettable fuse, 3A hold current, 9V max, 50A max fault, 0603 SMD. 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":"1 s","Current - Max":"50 A","Mounting Type":"Surface Mount","Voltage - Max":"9V","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 0.032\\\" W (1.60mm x 0.80mm)","Current - Trip (It)":"6 A","Height - Seated (Max)":"-","Operating Temperature":"-40°C ~ 85°C","Current - Hold (Ih) (Max)":"3 A","Resistance - Initial (Ri) (Min)":"3 mOhms","Resistance - Post Trip (R1) (Max)":"30 mOhms"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$3.6000","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/da8e56318cf01c04781c444c1a037361.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What are the key electrical ratings for the 0603L300/9SLYR?","answer":"Hold current (Ih) is 3 A, trip current (It) is 6 A, maximum voltage is 9 V, and maximum fault current is 50 A. Typical time to trip is 1 second at fault condition."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/littelfuse-inc/0603L300-9SLYR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/littelfuse-inc/0603L300-9SLYR 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}}