{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM3409QMY/NOPB","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM3409QMY-NOPB","canonicalUrl":"https://icboms.com/texas-instruments/LM3409QMY-NOPB","factsUrl":"https://icboms.com/api/mcp/products/LM3409QMY%2FNOPB","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments LM3409QMY/NOPB, Automotive AEC-Q100, DC DC Controller, Step-Down (Buck) LED Driver, 6V to 42V supply, PWM/Analog Dimming, Single Output, External Switch, -40°C to 125°C, 10-HVSSOP.","salesMarkdown":"## Automotive LED driver controller — fit and constraints The Texas Instruments LM3409QMY/NOPB is a DC-DC controller designed for driving LED strings in automotive lighting systems. It operates as a step-down (buck) controller with a single output, requiring an external MOSFET switch — no internal switch is integrated. The part supports both analog and PWM dimming, making it adaptable to headlamp, daytime-running-light, and interior-lighting designs that need smooth brightness control. Rated for -40°C to 125°C and AEC-Q100 qualified, this controller handles under-hood thermal cycling. The 6V to 42V supply range covers automotive battery voltages with load-dump headroom. Packaged in a 10-HVSSOP (3.00mm width PowerTFSOP/MSOP footprint), it suits space-constrained LED driver modules on a surface-mount assembly line. The ROHS3 compliance simplifies EU and global regulatory acceptance. ## What the key ratings mean for the BOM The 6V to 42V input range is the primary fit gate. Designs fed from a regulated 12V rail have margin; systems expecting 24V truck or bus power also fit. The 42V maximum handles the typical 40V load-dump clamp in automotive front-end protection — but verify the external MOSFET's VDS rating against the same transient. No internal switch means the BOM must include an external N-channel MOSFET and its gate-drive components. This adds board area and cost but gives the designer flexibility to size the switch for the LED current and thermal budget of the specific application — a 2A string uses a different FET than a 10A string. PWM dimming support allows the controller to accept a PWM signal from an ECU or lighting module for brightness control without analog drift. Analog dimming is also available for simpler constant-current adjustment via a control voltage.","metaTitle":"LM3409QMY/NOPB LED Driver Controller, Automotive AEC-Q100","metaDescription":"TI LM3409QMY/NOPB DC DC controller for LED drivers, step-down (buck) topology, 6V to 42V input, PWM/analog dimming, AEC-Q100, -40°C to 125°C.","metaKeywords":null},"attributes":{"series":"Automotive, AEC-Q100","packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Analog & Data Acquisition"],"specifications":{"Type":"DC DC Controller","Series":"Automotive, AEC-Q100","Dimming":"Analog, PWM","Package":"Tape & Reel (TR); Cut Tape (CT)","Topology":"Step-Down (Buck)","Applications":"Automotive","Mounting Type":"Surface Mount","Package / Case":"10-PowerTFSOP, 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)":"42V","Voltage - Supply (Min)":"6V","Supplier Device Package":"10-HVSSOP"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$2.36","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$2.36000","currency":"USD"},{"qty":10,"price":"$2.12100","currency":"USD"},{"qty":25,"price":"$2.00080","currency":"USD"},{"qty":100,"price":"$1.70460","currency":"USD"},{"qty":250,"price":"$1.60060","currency":"USD"},{"qty":500,"price":"$1.40052","currency":"USD"},{"qty":1000,"price":"$1.16044","currency":"USD"},{"qty":2000,"price":"$1.13250","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/61f46deabd02fff12b8992ff9aecbabe.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Does LM3409QMY/NOPB support PWM dimming?","answer":"Yes, the controller supports both analog and PWM dimming, giving flexibility for brightness control in automotive lighting applications."},{"question":"Is LM3409QMY/NOPB suitable for automotive headlamps?","answer":"Yes. The AEC-Q100 qualification, -40°C to 125°C operating range, and 6V to 42V supply make it suitable for headlamp, DRL, and exterior lighting modules. The external MOSFET allows sizing for the LED current needed."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM3409QMY-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/LM3409QMY-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}}