{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"DSC2044FI2-H0001B","brand":"Microchip Technology","brandSlug":"microchip","productSlug":"DSC2044FI2-H0001B","canonicalUrl":"https://icboms.com/microchip/DSC2044FI2-H0001B","factsUrl":"https://icboms.com/api/mcp/products/DSC2044FI2-H0001B","rawCanonicalId":null},"summary":{"shortDescription":"Microchip DSC2044FI2-H0001B, MEMS-based XO (Standard), dual 156.25 MHz HCSL outputs, ±25 ppm stability, 2.25V–3.6V supply, -40°C to 85°C, 14-VFQFN package.","salesMarkdown":"## Dual 156.25 MHz – PCIe and Ethernet reference clock The DSC2044FI2-H0001B delivers two identical 156.25 MHz HCSL outputs from a single MEMS resonator — the exact frequency used as the reference clock for PCIe Gen 3/4, 10GBASE-KR, and 25GBASE-CR interfaces. Both outputs run at the same frequency, so a single oscillator can clock the MAC and the PHY on separate lanes without a fanout buffer. ## ±25 ppm stability over industrial temperature Frequency stability is ±25 ppm total across the -40°C to 85°C range, supply variation from 2.25 V to 3.6 V, and aging — no external trim capacitors or VCXO control loop needed. For a 156.25 MHz clock, ±25 ppm equals ±3.9 kHz of absolute frequency error, well within the ±100 ppm tolerance of a standard Ethernet PHY. The 60 mA typical supply current covers both output drivers; the disable mode drops it to 23 mA for sleep states. ## 14-VFQFN – layout and thermal management The 14-lead VFQFN with exposed pad measures 3.20 mm × 2.50 mm (0.126\" × 0.098\") and stands 0.90 mm tall. The 0.50 mm pitch fan-out is manageable on a 2-layer board if the ground paddle vias are placed under the package. Product status is Active. No stock-holding claim is made; the order is placed upon your commitment.","metaTitle":"DSC2044FI2-H0001B – Microchip MEMS XO, Dual 156.25 MHz, HCSL","metaDescription":"DSC2044FI2-H0001B from Microchip: dual 156.25 MHz HCSL output, ±25 ppm stability, -40°C to 85°C, 14-VFQFN. Active production.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Crystals & Oscillators"],"specifications":{"Mfr":"Microchip Technology","Type":"XO (Standard)","Height":"0.035\\\" (0.90mm)","Output":"HCSL","Series":"DSC2044","Package":"Tape & Reel (TR)","Function":"Enable/Disable","Base Resonator":"MEMS","Package / Case":"14-VFQFN Exposed Pad","Product Status":"Active","lifecycle_stage":"eol_hot","Size / Dimension":"0.126\\\" L x 0.098\\\" W (3.20mm x 2.50mm)","Voltage - Supply":"2.25V ~ 3.6V","Base Product Number":"DSC2044","Frequency Stability":"±25ppm","Frequency - Output 1":"156.25MHz","Frequency - Output 2":"156.25MHz","Frequency - Output 3":"-","Frequency - Output 4":"-","Operating Temperature":"-40°C~85°C","Current - Supply (Max)":"60mA (Typ)","Current - Supply (Disable) (Max)":"23 mA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/961a0622be7bfe0860b322926ab30ab9.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the frequency of the DSC2044FI2-H0001B?","answer":"Both outputs are 156.25 MHz — the standard reference clock for PCIe Gen 3/4 and 10/25 GbE interfaces."},{"question":"What is the output type and does it have an enable/disable function?","answer":"Output is HCSL (High-Speed Current Steering Logic), the standard for PCIe reference clocks. Yes, the part has an enable/disable pin; when disabled the supply current drops to 23 mA max."},{"question":"What is the frequency stability and operating temperature range?","answer":"Frequency stability is ±25 ppm total over -40°C to 85°C, supply range 2.25 V to 3.6 V, and aging. The industrial temperature range qualifies it for outdoor telecom and industrial networking."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/microchip/DSC2044FI2-H0001B","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/microchip/DSC2044FI2-H0001B 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}}