{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"1206L012WR","brand":"Littelfuse Inc.","brandSlug":"littelfuse-inc","productSlug":"1206L012WR","canonicalUrl":"https://icboms.com/littelfuse-inc/1206L012WR","factsUrl":"https://icboms.com/api/mcp/products/1206L012WR","rawCanonicalId":null},"summary":{"shortDescription":"Littelfuse Inc. POLY-FUSE® 1206L series, Polymeric PTC Resettable Fuse, 1206L012WR, 125 mA hold, 30 V, 100 A max, 200 ms trip, 1206 (3216 Metric) concave package.","salesMarkdown":"## Resettable overcurrent protection for 125 mA rails The Littelfuse 1206L012WR is a polymeric PTC resettable fuse from the POLY-FUSE® 1206L series, designed to protect low-current DC power rails against overcurrent faults. Its 125 mA hold current (Ih) defines the maximum steady-state current the device passes without tripping; once the fault current exceeds the 290 mA trip current (It), the PTC element heats up and its resistance jumps from a typical 1.5 Ω initial resistance (Ri) to a maximum 6 Ω post-trip resistance (R1), limiting the fault current within 200 ms (time to trip). After the fault clears and power is removed, the device cools and resets to its low-resistance state — no fuse replacement needed. Rated for a maximum voltage of 30 V and capable of interrupting fault currents up to 100 A, this PTC suits secondary-side protection in DC-DC converters, USB ports, battery management, and other 5 V to 24 V circuits where a resettable overcurrent device is preferred over a one-time fuse. ## Package, approvals, and operating range The device carries cURus and TUV approvals, confirming compliance with North American and European safety standards for overcurrent protection components. ## Active production and sourcing posture The 1206L012WR is listed as Active on the manufacturer's lifecycle record, meaning Littelfuse continues to manufacture the part with no announced end-of-life.","metaTitle":"Littelfuse 1206L012WR PTC Resettable Fuse, 125 mA, 30 V","metaDescription":"Littelfuse 1206L012WR POLY-FUSE polymeric PTC resettable fuse, 125 mA hold current, 30 V max, 100 A interrupt, cURus/TUV. 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®, 1206L","Package":"Tape & Reel (TR); Cut Tape (CT)","Ratings":"-","Lead Spacing":"-","Time to Trip":"200 ms","Current - Max":"100 A","Mounting Type":"Surface Mount","Voltage - Max":"30V","Package / Case":"1206 (3216 Metric), Concave","Product Status":"Active","Approval Agency":"cURus, TUV","Thickness (Max)":"0.057\\\" (1.45mm)","lifecycle_stage":"unknown","Size / Dimension":"0.126\\\" L x 0.065\\\" W (3.20mm x 1.65mm)","Current - Trip (It)":"290 mA","Height - Seated (Max)":"-","Operating Temperature":"-40°C~85°C","Current - Hold (Ih) (Max)":"125 mA","Resistance - Initial (Ri) (Min)":"1.5 Ohms","Resistance - Post Trip (R1) (Max)":"6 Ohms"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.4900","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/cd6794590906b9a34104657bec909382.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the hold current and trip current of the 1206L012WR?","answer":"The 1206L012WR has a 125 mA hold current (Ih) and a 290 mA trip current (It). The device remains in its low-resistance state below 125 mA and trips when the current exceeds 290 mA, typically within 200 ms."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/littelfuse-inc/1206L012WR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/littelfuse-inc/1206L012WR 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}}