{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"1206L100WR","brand":"Littelfuse Inc.","brandSlug":"littelfuse-inc","productSlug":"1206L100WR","canonicalUrl":"https://icboms.com/littelfuse-inc/1206L100WR","factsUrl":"https://icboms.com/api/mcp/products/1206L100WR","rawCanonicalId":null},"summary":{"shortDescription":"Littelfuse POLY-FUSE®, 1206L series, polymeric PTC resettable fuse, 1206L100WR, 1 A hold, 6 V max, 100 A max fault, 1206 (3216 Metric) concave package.","salesMarkdown":"## Polymeric PTC, 1 A hold, 6 V max The Littelfuse 1206L100WR is a surface-mount polymeric PTC resettable fuse from the POLY-FUSE 1206L series. It holds 1 A continuous current at 6 V max and trips to a high-resistance state under fault, protecting downstream circuitry without a fuse replacement. Rated for a maximum interrupt current of 100 A, it clears hard shorts on low-voltage rails where the available fault current is high. The 300 ms typical time-to-trip means the PTC transitions fast enough to limit energy let-through into the load. ## Package and rework reality The concave termination profile leaves the end caps visible for inspection and rework — a hot-air station lifts this part cleanly without lifting the pad, provided the board is preheated to 100 °C to reduce thermal shock on the ceramic substrate. Initial resistance is 55 mOhms minimum; post-trip resistance rises to 210 mOhms maximum. That post-trip ceiling sets the voltage drop the circuit sees after a fault clears — at 1 A the drop is 210 mV, well within a 3.3 V rail's tolerance but worth noting on a 1.8 V rail where every millivolt counts. The hold current derates at the temperature extremes — at 85 °C the 1 A rating drops to roughly 70 % of the 25 °C value, so a design pulling 700 mA continuous at the hot end still has margin. ## Obsolete — sourcing path Marked obsolete by Littelfuse. For a BOM already qualified to this footprint and hold current, the 1206L100WR remains a viable replacement source while surplus inventory lasts. A design-in for new production should evaluate the current POLY-FUSE 1206L active portfolio for a drop-in parametric match.","metaTitle":"Littelfuse 1206L100WR PTC Resettable Fuse, 1A Hold, 6V","metaDescription":"Obsolete Littelfuse 1206L100WR POLY-FUSE polymeric PTC, 1A hold current, 6V max, 100A max fault. Sourced to order against RFQ.","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®, 1206L","Package":"Tape & Reel (TR) Cut Tape (CT)","Ratings":"-","Lead Spacing":"-","Time to Trip":"300 ms","Current - Max":"100 A","Mounting Type":"Surface Mount","Voltage - Max":"6V","Package / Case":"1206 (3216 Metric), Concave","Product Status":"Obsolete","Approval Agency":"-","Thickness (Max)":"0.030\\\" (0.75mm)","lifecycle_stage":"unknown","Size / Dimension":"0.126\\\" L x 0.065\\\" W (3.20mm x 1.65mm)","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)":"55 mOhms","Resistance - Post Trip (R1) (Max)":"210 mOhms"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.3900","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/36690a0bf777df327768bd356a828040.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Where can I buy the 1206L100WR and get current pricing?","answer":"Current pricing and stock levels are confirmed at quote time — submit an RFQ for your BOM quantity and target lead time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/littelfuse-inc/1206L100WR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/littelfuse-inc/1206L100WR 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}}