{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"DSC400-4444Q0023KI2","brand":"Microchip Technology","brandSlug":"microchip","productSlug":"DSC400-4444Q0023KI2","canonicalUrl":"https://icboms.com/microchip/DSC400-4444Q0023KI2","factsUrl":"https://icboms.com/api/mcp/products/DSC400-4444Q0023KI2","rawCanonicalId":null},"summary":{"shortDescription":"Microchip Technology DSC400 series, XO (Standard) MEMS oscillator, dual HCSL outputs 100 MHz and 156.25 MHz, ±25 ppm stability, 2.25V–3.6V supply, -40°C to 85°C, 20-VFQFN exposed pad, tube.","salesMarkdown":"## MEMS oscillator with dual HCSL clock outputs The DSC400-4444Q0023KI2 is a MEMS-based XO (Standard) oscillator from Microchip's DSC400 family, generating two independent HCSL outputs at 100 MHz and 156.25 MHz. HCSL (High-Speed Current Steering Logic) is the standard clock format for PCIe reference clocks — the 100 MHz output directly serves a PCIe root complex or switch, while the 156.25 MHz output is common for 10GbE and 25GbE Ethernet PHY reference clocks. ## Supply voltage and power-tree fit The wide supply range of 2.25V to 3.6V means this oscillator can run directly from a 2.5V or 3.3V rail without an intermediate LDO — a single 3.3V supply powers the oscillator and the downstream PCIe or Ethernet ICs. The 20-VFQFN with exposed pad (5.00 mm x 3.20 mm, 0.90 mm height) requires a thermal via array under the pad for proper heat dissipation — the exposed pad is the primary thermal path, not the package body. The 0.50 mm pitch of the QFN package demands careful fan-out; a 4-layer PCB with ground plane under the oscillator is recommended to maintain signal integrity on the HCSL outputs. ## Lifecycle and sourcing status No stock-holding claim — quoted to order.","metaTitle":"DSC400-4444Q0023KI2 MEMS XO – 100 MHz & 156.25 MHz HCSL","metaDescription":"Microchip DSC400-4444Q0023KI2 active MEMS XO, dual HCSL outputs at 100 MHz and 156.25 MHz, ±25 ppm stability, -40°C 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":"Tube","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,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/17298f21a67a7945826b04ab2911ec92.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the frequency stability of DSC400-4444Q0023KI2?","answer":"Frequency stability is ±25 ppm across the full -40°C to 85°C operating temperature range."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/microchip/DSC400-4444Q0023KI2","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/microchip/DSC400-4444Q0023KI2 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}}