{"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":"## Offline LED driver with Triac dimming — what it does and where it fits 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. ## Temperature range and environment Rated for -40°C to 125°C junction temperature, this part covers industrial and outdoor lighting enclosures where ambient heat builds up. 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. ## Lifecycle and sourcing The LM3445MM/NOPB is listed as Active with ROHS3 compliance.","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":["Analog & Data Acquisition"],"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","stockQuantity":0,"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},"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":"2026-07-17T19:50:00.618Z","lastPublished":"2026-07-17T19:50:00.618Z","indexable":true}}