{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"W181-51SZ","brand":"Infineon Technologies","brandSlug":"infineon","productSlug":"W181-51SZ","canonicalUrl":"https://icboms.com/infineon/W181-51SZ","factsUrl":"https://icboms.com/api/mcp/products/W181-51SZ","rawCanonicalId":null},"summary":{"shortDescription":"Cypress W181-51SZ, Clock/Frequency Synthesizer with Spread Spectrum, PLL Yes, Input Clock/Crystal, Output CMOS, 75 MHz max, 3.135V-3.465V / 4.5V-5.5V supply, 1 circuit, 1:1 ratio, 0°C to 70°C, 8-SOIC package, Surface Mount, ROHS3.","salesMarkdown":"## Spread spectrum — what it does for the board The spread-spectrum feature modulates the output frequency around the center frequency, spreading the radiated energy across a wider band. This lowers peak EMI amplitudes at the fundamental and harmonics, which can help a design pass FCC or CISPR radiated-emissions limits without adding ferrite beads or shielding cans. The modulation profile and deviation are set internally — no external programming pins. This is a set-and-forget EMI mitigation block for a single clock tree. ## Lifecycle and sourcing The W181-51SZ carries an active lifecycle status with ROHS3 compliance. The part is current-production, so BOM planners can freeze this line without imminent obsolescence risk.","metaTitle":"W181-51SZ Clock Generator, 75 MHz, Spread Spectrum, SOIC-8","metaDescription":"W181-51SZ clock/frequency synthesizer with spread spectrum, 75 MHz max, 3.3V/5V supply, SOIC-8. Active production.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Clock & Timing ICs"],"specifications":{"PLL":"Yes","Type":"Clock/Frequency Synthesizer, Spread Spectrum Clock Generator","Input":"Clock, Crystal","Output":"CMOS","Package":"Bulk","Mounting Type":"Surface Mount","Package / Case":"8-SOIC (0.154\\\", 3.90mm Width)","Frequency - Max":"75MHz","lifecycle_stage":"eol_hot","Voltage - Supply":"3.135V ~ 3.465V, 4.5V ~ 5.5V","Divider/Multiplier":"Yes/No","Number of Circuits":"1","Ratio - Input:Output":"1:1","Operating Temperature":"0°C ~ 70°C","Supplier Device Package":"8-SOIC","Differential - Input:Output":"No/No"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.04","stockQuantity":0,"priceTiers":[{"qty":289,"price":"$1.04000","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/743c0d10e4d2d2749a9544a0835d0525.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Can W181-51SZ be used with a 3.3V supply?","answer":"Yes. The W181-51SZ accepts a supply range of 3.135V to 3.465V, which covers the nominal 3.3V rail. It also accepts 4.5V to 5.5V for 5V designs, giving flexibility across mixed-voltage boards."},{"question":"What is the maximum output frequency of W181-51SZ?","answer":"The maximum output frequency is 75 MHz, delivered as a CMOS-level signal from the single output. The integrated PLL synthesizes this from the clock or crystal input."},{"question":"Is there a functional equivalent or cross-reference for W181-51SZ?","answer":"A close functional peer is the CY2305SXI-1HT from Cypress. Both integrate a PLL and generate clock outputs, but the CY2305SXI-1HT offers a 1:5 fanout ratio (five outputs) versus the W181-51SZ's single output, and it is rated for the industrial temperature range (-40°C to 85°C) versus the W181-51SZ's commercial 0°C to 70°C range. The CY2305SXI-1HT also operates from a fixed 3.0V supply, while the W181-51SZ accepts both 3.3V and 5V rails. For designs needing multiple clock outputs or wider temperature tolerance, the CY2305SXI-1HT is a valid alternative; for single-output, dual-supply application"}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/infineon/W181-51SZ","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/infineon/W181-51SZ 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}}