{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"SY87739LHY","brand":"Microchip Technology","brandSlug":"microchip","productSlug":"SY87739LHY","canonicalUrl":"https://icboms.com/microchip/SY87739LHY","factsUrl":"https://icboms.com/api/mcp/products/SY87739LHY","rawCanonicalId":null},"summary":{"shortDescription":"Microchip Technology AnyClock® series, Fractional-N PLL Synthesizer, SY87739LHY, 729 MHz max, PECL input/output, 32-TQFP Exposed Pad, Tray.","salesMarkdown":"## 729 MHz fractional-N PLL — the line-rate ceiling The SY87739LHY is a fractional-N PLL synthesizer from Microchip's AnyClock® family, clocking up to 729 MHz on the output. That maximum frequency sets the upper bound for the serial line rate it can generate or clean — 729 MHz is enough for 1 GbE, OC-12/STM-4 SONET, and 1x/2x Fibre Channel without an external multiplier. ## PECL signaling — what it means for the backplane Both input and output are PECL (PECL differential), with a 1:1 input-to-output ratio. PECL is the dominant clock standard in telecom and datacom line cards because its differential swing rejects common-mode noise across a backplane. The 3.15 V to 3.45 V supply rail is the PECL VCC range — the output swing is referenced to this rail, so the receiving PECL buffer must share the same supply or use AC-coupling with a bias network. ## Industrial temp and exposed-pad thermal path The 32-TQFP exposed pad (7x7 mm body) pulls heat from the die into a ground-plane via the center pad; the datasheet's RθJA assumes a thermal via array under the pad. Without those vias the junction temperature climbs above the 85°C ambient ceiling at the full 729 MHz toggle rate. ROHS3 means the part is free of the four phthalates (DEHP, BBP, DBP, DIBP) in addition to the original six RoHS substances, so no exemption-expiry risk for European or California-market builds.","metaTitle":"Microchip SY87739LHY Fractional-N PLL, 729 MHz","metaDescription":"Microchip SY87739LHY AnyClock® fractional-N synthesizer, 729 MHz max, PECL I/O, 32-TQFP EP. Active, ROHS3. Quoted to order.","metaKeywords":null},"attributes":{"series":"AnyClock®","packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Discrete Semiconductors"],"specifications":{"PLL":"Yes","Input":"PECL","Output":"PECL","Series":"AnyClock®","Package":"Tray","Main Purpose":"Ethernet, Fibre Channel, SONET/SDH/ATM","Mounting Type":"Surface Mount","Package / Case":"32-TQFP Exposed Pad","Frequency - Max":"729MHz","lifecycle_stage":"eol_hot","Voltage - Supply":"3.15V ~ 3.45V","Number of Circuits":"1","Ratio - Input:Output":"1:1","Operating Temperature":"-40°C ~ 85°C","Supplier Device Package":"32-TQFP-EP (7x7)","Differential - Input:Output":"Yes/Yes"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$34.15","priceTiers":[{"qty":1,"price":"$34.15000","currency":"USD"},{"qty":25,"price":"$28.46120","currency":"USD"},{"qty":100,"price":"$26.37000","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/d2ada621e9f94a53e34599d9cdbb55e3.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/SY87739LHY/alternatives.json"},"ai":{"faq":[{"question":"What is the SY87739LHY used for?","answer":"It is a fractional-N PLL synthesizer designed for Ethernet, Fibre Channel, and SONET/SDH/ATM clock generation. The 729 MHz maximum output and PECL differential signaling make it a fit for line-card timing in telecom switches, routers, and optical transport equipment."},{"question":"How can I get pricing and availability for the SY87739LHY?","answer":"Submit an RFQ through this listing. No stock-holding claim is made here — availability is verified per inquiry."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/microchip/SY87739LHY","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/microchip/SY87739LHY when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:49:49.435Z","lastPublished":"2026-08-11T15:49:49.435Z","indexable":true}}