{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LMX2531LQ1650E/NOPB","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LMX2531LQ1650E-NOPB","canonicalUrl":"https://icboms.com/texas-instruments/LMX2531LQ1650E-NOPB","factsUrl":"https://icboms.com/api/mcp/products/LMX2531LQ1650E%2FNOPB","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments LMX2531LQ1650E/NOPB PLL frequency synthesizer (RF), 1.7 GHz max frequency, CMOS output, 2.8V–3.2V supply, -40°C to 85°C, 36-WQFN (6x6) exposed pad.","salesMarkdown":"## PLL synthesizer with integrated VCO — what it is and where it fits The Texas Instruments LMX2531LQ1650E/NOPB is a PLL-based frequency synthesizer with an integrated VCO, designed for RF local-oscillator generation in wireless infrastructure, test equipment, and microwave backhaul. It accepts a clock input and delivers a CMOS output up to 1.7 GHz, covering bands such as cellular base-station LO synthesis and ISM-band signal chains. The single-circuit device uses a 2:2 input-to-output ratio, and the integrated divider/multiplier allows flexible frequency planning without external VCO modules. ## 1.7 GHz max frequency — what it means for the RF chain The 1.7 GHz upper limit sets the synthesizer's usable range for LO generation. The CMOS output drives standard digital PLL inputs directly, so no external level shifter is needed between the synthesizer and the downstream mixer or modulator. ## Industrial temperature grade and supply range Rated for -40°C to 85°C, this part suits outdoor telecom cabinets, base stations in uncontrolled enclosures, and industrial RF links where ambient temperatures swing. The 2.8V to 3.2V supply aligns with common 3.0V and 3.3V RF rails — check your regulator's tolerance, especially at cold-crank where the rail may dip toward 2.8V. The part remains operational within that window. ## Package and thermal handling for RF layout The 6x6 mm body with exposed pad demands a solid ground-plane via stitch under the pad for both thermal dissipation and RF grounding. The pad is the main heat path — without adequate vias, junction temperature climbs quickly above 85°C ambient. ## Lifecycle and sourcing posture Listed as Active with RoHS3 compliance.","metaTitle":"LMX2531LQ1650E/NOPB PLL Frequency Synthesizer, 1.7 GHz","metaDescription":"Texas Instruments LMX2531LQ1650E/NOPB PLL frequency synthesizer with integrated VCO. 1.7 GHz max frequency, CMOS output, industrial temp -40°C to 85°C.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Clock & Timing ICs"],"specifications":{"PLL":"Yes","Type":"Frequency Synthesizer (RF)","Input":"Clock","Output":"CMOS","Package":"Tape & Reel (TR); Cut Tape (CT)","Mounting Type":"Surface Mount","Package / Case":"36-WFQFN Exposed Pad","Frequency - Max":"1.7GHz","lifecycle_stage":"eol_hot","Voltage - Supply":"2.8V ~ 3.2V","Divider/Multiplier":"Yes/No","Number of Circuits":"1","Ratio - Input:Output":"2:2","Operating Temperature":"-40°C ~ 85°C","Supplier Device Package":"36-WQFN (6x6)","Differential - Input:Output":"No/No"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$13.57","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$13.57000","currency":"USD"},{"qty":10,"price":"$12.47500","currency":"USD"},{"qty":25,"price":"$11.95800","currency":"USD"},{"qty":100,"price":"$10.53610","currency":"USD"},{"qty":250,"price":"$10.01900","currency":"USD"},{"qty":500,"price":"$9.37262","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/fdd610e3e34ac7c680218100a27ac57e.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the frequency range of LMX2531LQ1650E/NOPB?","answer":"The maximum output frequency is 1.7 GHz. The synthesizer accepts a clock input and uses an internal divider/multiplier to generate the output, covering the range from low MHz up to that ceiling."},{"question":"What is the output type of LMX2531LQ1650E/NOPB?","answer":"CMOS. The single-ended CMOS output drives standard digital PLL inputs directly without external level translation."},{"question":"What is the difference between LMX2531LQ1650E and LMX2531LQ1650E/NOPB?","answer":"The /NOPB suffix indicates RoHS3 compliance (lead-free). The LMX2531LQ1650E base part number is the same device; the /NOPB variant is the current RoHS-compliant ordering option. Both are functionally identical."},{"question":"When sourcing LMX2531LQ1650E/NOPB, what's the closest functional second-source?","answer":"The CD74HCT7046AE is a PLL device but operates at 38 MHz maximum, through-hole, and with a different supply range (4.5V). It is not a pin-compatible or frequency-equivalent second source for the LMX2531LQ1650E/NOPB. No direct second-source alternate is listed for this RF synthesizer."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LMX2531LQ1650E-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/LMX2531LQ1650E-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}}