{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM3409QMYX/NOPB","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM3409QMYX-NOPB","canonicalUrl":"https://icboms.com/texas-instruments/LM3409QMYX-NOPB","factsUrl":"https://icboms.com/api/mcp/products/LM3409QMYX%2FNOPB","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments LM3409QMYX/NOPB, Automotive AEC-Q100, DC DC Controller, Step-Down (Buck) LED Driver, 42V Max Supply, Analog/PWM Dimming, Single Output, -40 to 125°C, 10-HVSSOP.","salesMarkdown":"## Controller for automotive LED strings — what it is and where it fits The Texas Instruments LM3409QMYX/NOPB is a DC DC controller designed to drive LED strings in a step-down (buck) topology. It is qualified to AEC-Q100, making it suitable for automotive exterior and interior lighting modules — headlamps, daytime running lights, taillights, and ambient lighting — where the supply rail is 12V or 24V with transients up to 42V. The part operates over a -40°C to 125°C junction temperature range, covering under-hood and cabin environments. Dimming is supported via both analog and PWM methods, giving the system designer flexibility to adjust brightness without a separate dimming IC. ## External MOSFET — design trade-off The LM3409QMYX/NOPB has no internal switch. This means the designer selects an external N-channel MOSFET sized for the LED string current and thermal dissipation. For a 1A string at 12V, a small SOT-23 FET may suffice; for a 3A string at 24V, a DPAK or TO-252 FET with a heatsink pad is typical. The controller's gate drive is designed for standard logic-level FETs. This external-FET approach adds two or three BOM lines but lets the thermal load sit off the controller package, which helps in compact 10-HVSSOP layouts. ## Supply range and transient headroom Minimum supply is 6V, maximum is 42V. On a nominal 12V automotive system, the 42V ceiling provides margin for load-dump events (typically clamped to 35V–40V in most ECUs). On a 24V truck or bus system, the same margin holds. The controller's undervoltage lockout ensures clean startup and shutdown behavior on the 6V low end. ## Lifecycle and compliance It is ROHS3 compliant, meaning no restricted substances above exemption thresholds. The package is a 10-lead HVSSOP (3.00 mm × 3.00 mm body), supplied in Tape & Reel for automated assembly. Cut Tape quantities are available for prototyping.","metaTitle":"LM3409QMYX/NOPB LED Driver Controller, Buck, 42V, AEC-Q100","metaDescription":"TI LM3409QMYX/NOPB DC DC controller, step-down (buck) LED driver, 42V max input, analog/PWM dimming, AEC-Q100, -40 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":"$1.97","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$1.97000","currency":"USD"},{"qty":10,"price":"$1.76700","currency":"USD"},{"qty":25,"price":"$1.66680","currency":"USD"},{"qty":100,"price":"$1.42020","currency":"USD"},{"qty":250,"price":"$1.33348","currency":"USD"},{"qty":500,"price":"$1.16680","currency":"USD"},{"qty":1000,"price":"$0.96677","currency":"USD"},{"qty":3500,"price":"$0.94350","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/61f46deabd02fff12b8992ff9aecbabe.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Is the LM3409QMYX/NOPB RoHS compliant?","answer":"Yes, the LM3409QMYX/NOPB is ROHS3 compliant, meeting EU RoHS exemption-free requirements."},{"question":"What are the alternatives to the LM3409QMYX/NOPB?","answer":"A functional alternative is the LM2703MF-ADJ/NOPB, which is a DC DC regulator (boost topology) with an internal switch, 0.35 A output, and backlight application focus. It is not a pin-compatible second source — the LM3409QMYX/NOPB is a buck controller with external FET, while the LM2703 is a boost regulator with integrated switch. For a buck controller replacement, stay within the TI LM3409 family or evaluate the TPS92641-Q1 for similar automotive LED drive."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM3409QMYX-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/LM3409QMYX-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}}