{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"1206L025/24YR","brand":"Littelfuse Inc.","brandSlug":"littelfuse-inc","productSlug":"1206L025-24YR","canonicalUrl":"https://icboms.com/littelfuse-inc/1206L025-24YR","factsUrl":"https://icboms.com/api/mcp/products/1206L025%2F24YR","rawCanonicalId":null},"summary":{"shortDescription":"Littelfuse POLY-FUSE 1206L series, Polymeric PTC Resettable Fuse, 1206L025/24YR, 250 mA hold, 24 VDC, 100 A max, 80 ms trip, Surface Mount 1206 (3216 Metric), Tape & Reel.","salesMarkdown":"## 250 mA hold, 550 mA trip — the PTC resettable fuse for 24 V rails The Littelfuse 1206L025/24YR is a polymeric PTC (positive temperature coefficient) resettable fuse from the POLY-FUSE 1206L series, designed to protect low-voltage DC power rails up to 24 V. Its 250 mA hold current (Ih) means the circuit operates normally up to that load; above 550 mA trip current (It) the device heats up and latches into a high-resistance state, limiting fault current to protect downstream components. Rated for a maximum fault current of 100 A and a typical trip time of 80 ms at 25 °C, it clears overcurrent events quickly enough to prevent damage to the PCB trace or load before the fault escalates. ## Resistance profile and thermal limits Initial resistance (Ri) is a minimum of 550 mOhms; after tripping, the post-trip resistance (R1) rises to a maximum of 2.3 Ohms. This resistance swing is normal for polymeric PTCs — the device self-heats during a fault and the polymer matrix expands, increasing resistance by roughly 4×. Once power is removed and the device cools, it resets to the low-resistance state automatically. Derate the hold current at elevated ambient temperatures per the POLY-FUSE 1206L series curve — at 85 °C the effective hold current drops to roughly 60% of the 25 °C rating, so a 250 mA hold at 25 °C becomes ~150 mA at the high end of the range.","metaTitle":"Littelfuse 1206L025/24YR PTC Resettable Fuse, 250 mA Hold","metaDescription":"Littelfuse 1206L025/24YR POLY-FUSE polymeric PTC resettable fuse, 250 mA hold current, 24V max, 100 A max fault, 80 ms trip. Active, cURus/TUV approved.","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":"80 ms","Current - Max":"100 A","Mounting Type":"Surface Mount","Voltage - Max":"24V","Package / Case":"1206 (3216 Metric), Concave","Product Status":"Active","Approval Agency":"cURus, TUV","Thickness (Max)":"0.039\\\" (1.00mm)","lifecycle_stage":"unknown","Size / Dimension":"0.126\\\" L x 0.065\\\" W (3.20mm x 1.65mm)","Current - Trip (It)":"550 mA","Height - Seated (Max)":"-","Operating Temperature":"-40°C ~ 85°C","Current - Hold (Ih) (Max)":"250 mA","Resistance - Initial (Ri) (Min)":"550 mOhms","Resistance - Post Trip (R1) (Max)":"2.3 Ohms"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.5700","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/b8fc92bc33c264d26251f523f168bfed.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the closest pin-compatible alternative to 1206L025/24YR in this Circuit Protection family?","answer":"Within the POLY-FUSE 1206L series, the 1206L035/24YR (350 mA hold) and 1206L050/24YR (500 mA hold) share the same 1206 footprint and 24 V rating. Choose based on the required hold current for your circuit — no board layout change is needed."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/littelfuse-inc/1206L025-24YR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/littelfuse-inc/1206L025-24YR 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}}