{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LMX2491RTWR","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LMX2491RTWR","canonicalUrl":"https://icboms.com/texas-instruments/LMX2491RTWR","factsUrl":"https://icboms.com/api/mcp/products/LMX2491RTWR","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments LMX2491RTWR, RF Frequency Synthesizer (PLL), 1 Circuit, 2:1 Input:Output, Clock Input/Output, 6.4 GHz Max, 3.15V-3.45V, -40°C to 125°C, 24-WQFN Exposed Pad.","salesMarkdown":"## RF frequency synthesizer with integrated PLL — what it covers and what it needs The Texas Instruments LMX2491RTWR is a single-chip frequency synthesizer combining a phase-locked loop (PLL) with a VCO core, designed to generate clock or local-oscillator signals up to 6.4 GHz. It accepts a reference clock input and outputs a synthesized clock, with an internal divider and multiplier chain that lets you lock to a multiple or submultiple of the reference. The 2:1 input-to-output ratio means two reference inputs can be selected, but the output path is single-ended — no differential signaling on either side. The part is built for RF and microwave applications: point-to-point radio, radar local oscillators, 5G NR frequency generation, and test equipment that needs a clean, programmable carrier up into C-band. The supply range is 3.15 V to 3.45 V. The industrial temperature grade covers -40°C to 125°C. ## Package and mounting — thermal pad is not optional The LMX2491RTWR comes in a 24-lead WFQFN with an exposed thermal pad (4 mm × 5 mm body,). That pad must be soldered to a PCB copper land with thermal vias to a ground plane; without it, the junction temperature rises well above the 125°C limit under continuous operation at the upper frequency range. The package is surface-mount only, supplied in Tape & Reel or Cut Tape — no tube or tray option. ## Lifecycle and sourcing reality The LMX2491RTWR is listed as Active and ROHS3 compliant. There is no LTB notice or NRND flag in the record — this part is still in regular production and available through the standard TI distribution network. For a BOM line that needs an RF PLL up to 6.4 GHz, this is a current-design-in candidate, not a last-time-buy scavenge.","metaTitle":"Texas Instruments LMX2491RTWR RF Frequency Synthesizer","metaDescription":"Texas Instruments LMX2491RTWR RF frequency synthesizer with integrated PLL, max 6.4 GHz output. Active, ROHS3, -40°C to 125°C.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Analog & Data Acquisition"],"specifications":{"PLL":"Yes","Type":"Frequency Synthesizer (RF)","Input":"Clock","Output":"Clock","Package":"Tape & Reel (TR); Cut Tape (CT)","Mounting Type":"Surface Mount","Package / Case":"24-WFQFN Exposed Pad","Frequency - Max":"6.4GHz","lifecycle_stage":"eol_hot","Voltage - Supply":"3.15V ~ 3.45V","Divider/Multiplier":"Yes/Yes","Number of Circuits":"1","Ratio - Input:Output":"2:1","Operating Temperature":"-40°C ~ 125°C","Supplier Device Package":"24-WQFN (4x5)","Differential - Input:Output":"No/No"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$7.08","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$7.08000","currency":"USD"},{"qty":10,"price":"$6.39700","currency":"USD"},{"qty":25,"price":"$6.09960","currency":"USD"},{"qty":100,"price":"$5.29620","currency":"USD"},{"qty":250,"price":"$5.05820","currency":"USD"},{"qty":500,"price":"$4.61190","currency":"USD"},{"qty":1000,"price":"$4.21050","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/d8fbb57cb43518de660b9a1af57acd64.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Does LMX2491RTWR support 6.4 GHz output?","answer":"Yes, the maximum output frequency is rated at 6.4 GHz. That covers C-band (4–8 GHz) local-oscillator generation and 5G NR frequency bands up to n104."},{"question":"What is an equivalent replacement for LMX2491RTWR?","answer":"The listed peer CD74HCT7046AE is a through-hole 74HCT PLL operating at 38 MHz max with a 4.5 V supply — it is not a functional equivalent. The LMX2491RTWR is an RF-frequency synthesizer; a replacement would need to match the 6.4 GHz range, 3.3 V supply, and QFN package. No direct second-source alternate is recorded."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LMX2491RTWR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/LMX2491RTWR 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}}