{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"1206L050YR","brand":"Littelfuse Inc.","brandSlug":"littelfuse-inc","productSlug":"1206L050YR","canonicalUrl":"https://icboms.com/littelfuse-inc/1206L050YR","factsUrl":"https://icboms.com/api/mcp/products/1206L050YR","rawCanonicalId":null},"summary":{"shortDescription":"Littelfuse Inc. POLY-FUSE® 1206L series, Type Polymeric PTC resettable fuse, 1206L050YR, 500 mA hold current, 6V max, 100 A max fault, 1206 (3216 Metric) concave package, Tape & Reel.","salesMarkdown":"## Hold current and trip behaviour The 1206L050YR is a Littelfuse POLY-FUSE® series polymeric PTC resettable fuse. It holds 500 mA continuous without tripping; when the fault current pushes the internal temperature past the polymer's switching threshold, the resistance jumps from a 150 mOhm minimum to a 700 mOhm maximum post-trip state, limiting the current to a safe level. The trip time is 100 ms at the fault current — fast enough to protect a 6V rail feeding a USB port or a sensor node before the downstream regulator overheats. After the fault clears and power cycles, the PTC resets and the circuit returns to normal operation. ## Fault current ceiling and voltage limit Rated for a maximum fault current of 100 A at 6V. The 6V maximum voltage restricts this part to low-voltage DC rails — USB VBUS (5V), battery-powered handhelds, or logic supplies. Do not use it on 12V or 24V industrial buses; the voltage exceeds the PTC's dielectric withstand and the device may not trip cleanly. ## Package and board integration The concave termination profile improves solder-joint inspection — the side-wall fillet is visible after reflow, unlike a flat-chip termination where the joint hides under the body. Surface-mount mounting per standard 1206 footprint. The Tape & Reel packaging (Cut Tape option available) feeds into pick-and-place without a feeder change. Store the reels in a dry cabinet if the ambient humidity exceeds 60% RH — the moisture sensitivity level is not stated, but a 24-hour bake at 125°C before reflow is a safe precaution for any 1206 polymeric device. ## Temperature range and approvals The -40°C low end means the PTC trips at a slightly higher current in cold environments, but the trip time remains within the 100 ms window. Carries cURus and TUV approvals — the cURus mark certifies compliance with UL 1434 and CSA C22.2 No. 0.4 for polymeric PTCs; TUV certification confirms it meets IEC 60738-1 for thermally sensitive resistors. Both are required for equipment sold into North American and European markets.","metaTitle":"Littelfuse 1206L050YR PTC Resettable Fuse, 500mA, 6V, 1206","metaDescription":"Littelfuse 1206L050YR POLY-FUSE polymeric PTC, 500 mA hold, 100 A max, 6V, 1206 package. Active production. cURus, TUV. 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":"100 ms","Current - Max":"100 A","Mounting Type":"Surface Mount","Voltage - Max":"6V","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)":"700 mOhms"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.4900","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/b8fc92bc33c264d26251f523f168bfed.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Where can I buy 1206L050YR and what is the lead time?","answer":"Availability and current lead time are confirmed at quote time — submit an RFQ for the exact quantity and delivery window."},{"question":"What is the hold current and trip current for 1206L050YR?","answer":"Hold current (Ih) is 500 mA maximum — the device will not trip below this current. Trip current (It) is 1 A — at or above this level the PTC switches to its high-resistance state within 100 ms."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/littelfuse-inc/1206L050YR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/littelfuse-inc/1206L050YR 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}}