{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"0603L035ZR","brand":"Littelfuse Inc.","brandSlug":"littelfuse-inc","productSlug":"0603L035ZR","canonicalUrl":"https://icboms.com/littelfuse-inc/0603L035ZR","factsUrl":"https://icboms.com/api/mcp/products/0603L035ZR","rawCanonicalId":null},"summary":{"shortDescription":"Littelfuse POLY-FUSE® 0603L series, PTC resettable fuse, 0603 (1608 Metric) package, 350 mA hold current, 6V max, 40A max current, Tape & Reel.","salesMarkdown":"## What the ratings mean on the bench The 0603L035ZR is a Littelfuse POLY-FUSE® polymeric PTC resettable fuse in a 0603 surface-mount package, rated for a hold current of 350 mA and a trip current of 750 mA at 25°C. At 6V max and 40A max fault current, it protects low-voltage rails — think USB VBUS, battery outputs, or peripheral power — where a short pulls the line below the supply's current limit. The 100 ms trip time at 25°C means the PTC heats and latches high-resistance fast enough to keep the downstream silicon below its I²t damage threshold in most 6V bus faults. Post-trip resistance rises to 1 ohm max, so after the fault clears and the part cools, the residual voltage drop at 350 mA is under 350 mV — the load sees a clean restart. Approvals include cURus and TUV, so the part carries recognized safety marks for equipment destined for North American and European markets.","metaTitle":"0603L035ZR Littelfuse PTC Resettable Fuse, 350 mA Hold","metaDescription":"0603L035ZR Littelfuse POLY-FUSE PTC resettable fuse, 350 mA hold, 6V max, 40A max current. Obsolete — sourced to order. cURus, TUV. RFQ for availability.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Obsolete","categoryPath":["Circuit Protection"],"specifications":{"Mfr":"Littelfuse Inc.","Type":"Polymeric","Series":"POLY-FUSE®, 0603L","Package":"Tape & Reel (TR)","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":"Obsolete","Approval Agency":"cURus, TUV","Thickness (Max)":"0.030\\\" (0.75mm)","lifecycle_stage":"unknown","Size / Dimension":"0.063\\\" L x 0.031\\\" W (1.60mm x 0.80mm)","Current - Trip (It)":"750 mA","Height - Seated (Max)":"-","Operating Temperature":"-40°C~85°C","Current - Hold (Ih) (Max)":"350 mA","Resistance - Initial (Ri) (Min)":"200 mOhms","Resistance - Post Trip (R1) (Max)":"1 Ohms"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/f3e6b5aefd63d9cd1e6d6b839ee617f3.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the closest pin-compatible alternative to 0603L035ZR in this Circuit Protection family?","answer":"No official pin-compatible successor is recorded from Littelfuse. A functional replacement would require comparing hold current, trip current, and package footprint from the current POLY-FUSE 0603L series — confirm the BOM position before substituting."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/littelfuse-inc/0603L035ZR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/littelfuse-inc/0603L035ZR when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-20T14:34:45.345Z","lastPublished":"2026-07-20T14:34:45.345Z","indexable":true}}