{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"DSC400-4444Q0023KI2T","brand":"Microchip Technology","brandSlug":"microchip","productSlug":"DSC400-4444Q0023KI2T","canonicalUrl":"https://icboms.com/microchip/DSC400-4444Q0023KI2T","factsUrl":"https://icboms.com/api/mcp/products/DSC400-4444Q0023KI2T","rawCanonicalId":null},"summary":{"shortDescription":"Microchip DSC400 series, XO (Standard) MEMS oscillator, dual HCSL outputs 100 MHz and 156.25 MHz, ±25 ppm stability, 2.25V–3.6V supply, -40 to +85°C, 20-VFQFN exposed pad, tape & reel.","salesMarkdown":"## Dual-frequency HCSL clock source for PCIe and Ethernet The DSC400-4444Q0023KI2T is a MEMS-based XO (Standard) oscillator that delivers two HCSL outputs at 100 MHz and 156.25 MHz from a single 20-VFQFN package. These frequencies are common reference clocks for PCIe and 10/25 GbE SERDES, so this part can replace two discrete quartz oscillators on the same board footprint. ## MEMS reliability vs quartz in industrial temperature The supply voltage range of 2.25V to 3.6V covers common 2.5V and 3.3V rails without an external LDO, simplifying the power tree. The 5.00 mm × 3.20 mm × 0.90 mm 20-VFQFN package with exposed pad requires a thermal via pattern under the pad for proper heat dissipation; the small footprint fits dense multi-layer boards.","metaTitle":"DSC400-4444Q0023KI2T Dual HCSL MEMS Oscillator","metaDescription":"DSC400-4444Q0023KI2T XO (Standard) MEMS oscillator from Microchip, dual HCSL outputs at 100 MHz and 156.25 MHz, ±25 ppm stability, -40 to +85°C, 20-VFQFN.","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":"DSC400","Package":"Tape & Reel (TR)","Function":"Enable/Disable","Base Resonator":"MEMS","Package / Case":"20-VFQFN Exposed Pad","Product Status":"Active","lifecycle_stage":"eol_hot","Size / Dimension":"0.197\\\" L x 0.126\\\" W (5.00mm x 3.20mm)","Voltage - Supply":"2.25V ~ 3.6V","Base Product Number":"DSC400","Frequency Stability":"±25ppm","Frequency - Output 1":"100MHz","Frequency - Output 2":"156.25MHz","Frequency - Output 3":"-","Frequency - Output 4":"-","Operating Temperature":"-40°C~85°C","Current - Supply (Max)":"-"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/17298f21a67a7945826b04ab2911ec92.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/DSC400-4444Q0023KI2T/alternatives.json"},"ai":{"faq":[{"question":"Can the DSC400-4444Q0023KI2T replace a standard quartz oscillator?","answer":"Yes, in most designs. The MEMS resonator offers faster startup and better shock/vibration immunity than quartz, but the output is HCSL — not LVCMOS — so the receiver must accept HCSL levels. Check the input buffer on your SERDES or FPGA bank before substituting."},{"question":"What is the output type of the DSC400-4444Q0023KI2T?","answer":"HCSL (High-Speed Current Steering Logic). This is the standard differential clock format for PCIe Gen1/2/3 and many Ethernet PHY reference clocks."},{"question":"Is the DSC400-4444Q0023KI2T compatible with a 2.5V supply?","answer":"Yes. The supply range is 2.25V to 3.6V, so 2.5V and 3.3V rails both fall within the operating envelope without an external regulator."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/microchip/DSC400-4444Q0023KI2T","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/microchip/DSC400-4444Q0023KI2T 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}}