{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"1206L050/15YR","brand":"Littelfuse Inc.","brandSlug":"littelfuse-inc","productSlug":"1206L050-15YR","canonicalUrl":"https://icboms.com/littelfuse-inc/1206L050-15YR","factsUrl":"https://icboms.com/api/mcp/products/1206L050%2F15YR","rawCanonicalId":null},"summary":{"shortDescription":"Littelfuse POLY-FUSE® 1206L series, Polymeric PTC Resettable Fuse, 1206L050/15YR, 500 mA hold, 15 V, 100 A max, surface mount, 1206 concave.","salesMarkdown":"## Active production and BOM-fit baseline The Littelfuse 1206L050/15YR is an active-production polymeric PTC resettable fuse in the POLY-FUSE® 1206L series, rated for a hold current of 500 mA at 15 V max. This means it passes normal circuit current up to half an amp and trips when the fault current exceeds 1 A, resetting after the overcurrent condition clears and power is removed. With a maximum fault current rating of 100 A, it safely interrupts high-energy shorts without rupturing, provided the supply impedance keeps the prospective short-circuit current below that ceiling. The 100 ms typical time-to-trip at 8 A (from the series characteristic) means fast-acting protection for downstream silicon. ## Resistance states and thermal budget Initial resistance is a minimum of 150 mOhms; after tripping and cooling, the post-trip resistance rises to a maximum of 750 mOhms. The ratio between these two states — roughly 5× — is typical for a polymeric PTC and means the series resistance in the circuit path changes after a fault event, which can affect low-voltage rail regulation if the PTC is in the feedback path. Derate the hold current above 25°C per the POLY-FUSE 1206L curve — at 85°C ambient the effective hold current drops to roughly 60% of the 25°C rating, so a 500 mA nominal part may only carry 300 mA reliably in a hot enclosure. ## Footprint and approvals The concave termination profile suits standard reflow soldering and allows visual inspection of the solder joint fillet. Surface-mount pick-and-place compatible. Approved by cURus and TUV, covering North American and European safety agency requirements for overcurrent protection components. The approvals certify the part meets UL 1434 and IEC 60738-1 standards for polymeric PTCs.","metaTitle":"Littelfuse 1206L050/15YR PTC Resettable Fuse, 500 mA Hold","metaDescription":"Active Littelfuse POLY-FUSE 1206L050/15YR polymeric PTC resettable fuse. 500 mA hold current, 15 V max, 100 A fault rating. 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":"100 ms","Current - Max":"100 A","Mounting Type":"Surface Mount","Voltage - Max":"15V","Package / Case":"1206 (3216 Metric), Concave","Product Status":"Active","Approval Agency":"cURus, TUV","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 A","Height - Seated (Max)":"-","Operating Temperature":"-40°C~85°C","Current - Hold (Ih) (Max)":"500 mA","Resistance - Initial (Ri) (Min)":"150 mOhms","Resistance - Post Trip (R1) (Max)":"750 mOhms"}},"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 and trip current for the 1206L050/15YR?","answer":"The hold current (Ih) is 500 mA maximum at 25°C, meaning the part will not trip below this current under normal conditions. The trip current (It) is 1 A, at which the PTC begins to heat and switch to its high-resistance state within 100 ms typical."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/littelfuse-inc/1206L050-15YR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/littelfuse-inc/1206L050-15YR 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}}