{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LMX2331LTMX","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LMX2331LTMX","canonicalUrl":"https://icboms.com/texas-instruments/LMX2331LTMX","factsUrl":"https://icboms.com/api/mcp/products/LMX2331LTMX","rawCanonicalId":null},"summary":{"shortDescription":"National Semiconductor LMX2331LTMX, Frequency Synthesizer, PLL Yes with Bypass, 2.7V–5.5V supply, CMOS/TTL input, CMOS output, -40°C to 85°C, 20-TSSOP surface mount.","salesMarkdown":"## PLL frequency synthesizer with bypass path The National Semiconductor LMX2331LTMX is a single-circuit frequency synthesizer that integrates a phase-locked loop with a bypass mode — the PLL can be engaged for frequency synthesis or bypassed to pass the reference clock through unmodified. It accepts CMOS or TTL reference inputs and delivers a CMOS-level output, making it a straightforward clock-conditioning block for mixed-logic boards. The 3:1 input-to-output ratio (three selectable inputs to one output) gives the designer a way to multiplex clock sources without an external mux. ## Package and footprint Housed in a 20-lead TSSOP (LSSOP) package with a 4.40 mm body width, the LMX2331LTMX is a surface-mount part that shares the common 20-TSSOP land pattern. The supplier device package is listed as 20-TSSOP. ## Sourcing and compliance note The LMX2331LTMX is listed as Active in production — no last-time-buy risk for current designs. However, it is marked RoHS non-compliant, which means it contains lead (Pb) above the RoHS threshold. This is not a problem for military, aerospace, or industrial equipment with a RoHS exemption, but it blocks use in EU consumer goods and any RoHS-mandated assembly line. If your BOM requires lead-free solder, this part will not pass incoming inspection without a waiver.","metaTitle":"LMX2331LTMX Frequency Synthesizer, PLL with Bypass","metaDescription":"LMX2331LTMX frequency synthesizer from National Semiconductor. PLL with bypass, 2.7V–5.5V supply, -40°C to 85°C, 20-TSSOP. Active, RoHS non-compliant.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"RoHS non-compliant","productStatus":"Active","categoryPath":["Analog & Data Acquisition"],"specifications":{"PLL":"Yes with Bypass","Type":"Frequency Synthesizer","Input":"CMOS, TTL","Output":"CMOS","Package":"Bulk","Mounting Type":"Surface Mount","Package / Case":"20-LSSOP (0.173\\\", 4.40mm Width)","lifecycle_stage":"eol_hot","Voltage - Supply":"2.7V ~ 5.5V","Divider/Multiplier":"Yes/No","Number of Circuits":"1","Ratio - Input:Output":"3:1","Operating Temperature":"-40°C ~ 85°C (TA)","Supplier Device Package":"20-TSSOP","Differential - Input:Output":"No/No"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.4","stockQuantity":0,"priceTiers":[{"qty":214,"price":"$1.40000","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/7e89f5cfd3c5631936bcf86efae59736.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Is LMX2331LTMX RoHS compliant?","answer":"No — the LMX2331LTMX is marked RoHS non-compliant. It contains lead and is not suitable for RoHS-mandated assemblies unless a specific exemption applies."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LMX2331LTMX","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/LMX2331LTMX 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}}