{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM3445MM/NOPB","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM3445MM-NOPB","canonicalUrl":"https://icboms.com/texas-instruments/LM3445MM-NOPB","factsUrl":"https://icboms.com/api/mcp/products/LM3445MM%2FNOPB","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments LM3445MM/NOPB, AC DC Offline Switcher, Triac dimming, Step-Down (Buck) topology, 30kHz ~ 1MHz, 1 output, No internal switch, 8V ~ 12V supply, -40°C ~ 125°C, 10-VSSOP package.","salesMarkdown":"The Texas Instruments LM3445MM/NOPB is an AC DC Offline Switcher controller designed for LED lighting applications that require Triac dimming compatibility. It uses a Step-Down (Buck) topology, operates from an 8V to 12V supply, and switches at a frequency adjustable from 30kHz to 1MHz. The controller has no internal power switch — it drives an external MOSFET — and delivers a single regulated output. The 10-VSSOP package suits compact LED driver boards in retrofit bulbs, downlights, and other mains-powered luminaires where dimmer compatibility is needed. The wide range also accommodates automotive exterior lighting if the supply rail is derived from the vehicle's 12V bus — though the part itself is not AEC-Q100 listed in the record. ## Switching frequency — inductor sizing vs efficiency The 30kHz to 1MHz range lets you trade inductor size against switching losses. ## No internal switch — external MOSFET required Because the LM3445MM/NOPB has no internal switch, the BOM includes an external MOSFET and its gate-drive components. This adds board area but gives flexibility to choose the FET based on the output current and voltage stress of the specific LED load. For a 1A output at 12V, a small SOT-23 MOSFET suffices; higher currents need a larger DPAK or similar.","metaTitle":"LM3445MM/NOPB AC DC Offline Switcher, Triac Dimming","metaDescription":"LM3445MM/NOPB AC DC Offline Switcher LED driver with Triac dimming, buck topology, 30kHz-1MHz, -40°C to 125°C. Active, ROHS3.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Discrete Semiconductors"],"specifications":{"Type":"AC DC Offline Switcher","Dimming":"Triac","Package":"Tape & Reel (TR); Cut Tape (CT)","Topology":"Step-Down (Buck)","Frequency":"30kHz ~ 1MHz","Applications":"Lighting","Mounting Type":"Surface Mount","Package / Case":"10-TFSOP, 10-MSOP (0.118\\\", 3.00mm Width)","lifecycle_stage":"eol_hot","Number of Outputs":"1","Internal Switch(s)":"No","Operating Temperature":"-40°C ~ 125°C (TJ)","Voltage - Supply (Max)":"12V","Voltage - Supply (Min)":"8V","Supplier Device Package":"10-VSSOP"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.26","priceTiers":[{"qty":1,"price":"$1.26000","currency":"USD"},{"qty":10,"price":"$1.12600","currency":"USD"},{"qty":25,"price":"$1.06840","currency":"USD"},{"qty":100,"price":"$0.87770","currency":"USD"},{"qty":250,"price":"$0.82044","currency":"USD"},{"qty":500,"price":"$0.72504","currency":"USD"},{"qty":1000,"price":"$0.57240","currency":"USD"},{"qty":2000,"price":"$0.54000","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/6e44fc120129c6bd347c116e1840dc4b.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/LM3445MM%2FNOPB/alternatives.json"},"ai":{"faq":[{"question":"Can LM3445MM/NOPB be used with 120VAC triac dimmers?","answer":"Yes — the part is specifically designed for Triac dimming, which is the standard phase-cut dimmer used in 120VAC residential lighting. The buck controller maintains constant LED current while the dimmer chops the AC waveform."},{"question":"What are the alternatives to LM3445MM/NOPB?","answer":"The TLC69611RTWR is a linear LED driver with PWM dimming and 16 outputs, but it is not a direct functional replacement — it lacks offline AC-DC capability and Triac dimming. For a similar offline Triac-dimming buck controller, stay within the LM3445 family or evaluate newer TI parts like the LM3447."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM3445MM-NOPB","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/LM3445MM-NOPB 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}}