{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM3402MR/NOPB","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM3402MR-NOPB","canonicalUrl":"https://icboms.com/texas-instruments/LM3402MR-NOPB","factsUrl":"https://icboms.com/api/mcp/products/LM3402MR%2FNOPB","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments LM3402MR/NOPB, DC DC Regulator, Step-Down (Buck) LED driver, 1 MHz switching, 500 mA output, PWM dimming, 8-PowerSOIC package, -40°C to 125°C.","salesMarkdown":"## What this buck LED driver brings to the board The TI LM3402MR/NOPB is a constant-current buck LED driver in an 8-PowerSOIC package, switching at 1 MHz and delivering up to 500 mA per channel with PWM dimming. It operates from a 6 V to 42 V supply and regulates the output voltage to 40 V maximum. The internal switching FET handles the full load, so no external power transistor is needed. This part is aimed at lighting applications — architectural, signage, or general-purpose constant-current LED strings — where the 1 MHz switching keeps the inductor and capacitor small enough to fit the board area an 8-pin SOIC footprint allows. ## 1 MHz switching — what it buys the layout At 1 MHz the switching period is 1 µs, which lets the designer use a physically smaller inductor than a lower-frequency buck would need. For a 500 mA load, a shielded inductor is typical. ## Sourcing and lifecycle Texas Instruments lists the LM3402MR/NOPB as Active. For dual-sourcing evaluation, the closest functional sibling is the LM2703MF-ADJ/NOPB, a boost (step-up) LED driver with 350 mA output, which is a different topology — not a pin-for-pin swap.","metaTitle":"LM3402MR/NOPB LED Driver, DC-DC Buck Regulator, 1 MHz","metaDescription":"LM3402MR/NOPB is a DC-DC buck LED driver with PWM dimming, 40 V output, 500 mA per channel, 1 MHz switching. Active production.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Analog & Data Acquisition"],"specifications":{"Type":"DC DC Regulator","Dimming":"PWM","Package":"Tube","Topology":"Step-Down (Buck)","Frequency":"1MHz","Applications":"Lighting","Mounting Type":"Surface Mount","Package / Case":"8-PowerSOIC (0.154\\\", 3.90mm Width)","lifecycle_stage":"eol_hot","Voltage - Output":"40V","Number of Outputs":"1","Internal Switch(s)":"Yes","Operating Temperature":"-40°C ~ 125°C (TJ)","Voltage - Supply (Max)":"42V","Voltage - Supply (Min)":"6V","Supplier Device Package":"8-SO PowerPad","Current - Output / Channel":"500mA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$2.34","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$2.34000","currency":"USD"},{"qty":10,"price":"$2.10400","currency":"USD"},{"qty":25,"price":"$1.98480","currency":"USD"},{"qty":100,"price":"$1.69110","currency":"USD"},{"qty":250,"price":"$1.58788","currency":"USD"},{"qty":500,"price":"$1.38940","currency":"USD"},{"qty":1000,"price":"$1.15121","currency":"USD"},{"qty":2500,"price":"$1.12350","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/a38d10194c187801576d72d31d718e4f.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the difference between LM3402 and LM3404?","answer":"The LM3404 is a higher-current sibling rated for 1.2 A output versus the 500 mA of the LM3402. Both are buck LED drivers with PWM dimming and 1 MHz switching, but the LM3404 requires a larger inductor and wider PCB copper pour for thermal management."},{"question":"How do I use LM3402MR/NOPB as a constant current LED driver?","answer":"Connect the LED string between the output and the sense resistor (R_sns) to ground. The internal regulation loop adjusts the duty cycle to maintain the voltage across R_sns at 200 mV typical, setting the LED current as I_LED = 0.2 V / R_sns. For 500 mA, use a 0.4 Ω sense resistor. Apply a PWM signal to the DIM pin for brightness control."},{"question":"Is LM3402MR/NOPB a direct replacement for LM3402?","answer":"Yes — the LM3402MR/NOPB is the ROHS3-compliant, lead-free version of the original LM3402. The suffix /NOPB indicates no lead (Pb) in the package. Electrical specifications and pinout are identical."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM3402MR-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/LM3402MR-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}}