{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"9ZX21901BKLF","brand":"Renesas Electronics","brandSlug":"renesas","productSlug":"9ZX21901BKLF","canonicalUrl":"https://icboms.com/renesas/9ZX21901BKLF","factsUrl":"https://icboms.com/api/mcp/products/9ZX21901BKLF","rawCanonicalId":null},"summary":{"shortDescription":"Renesas 9ZX21901BKLF, PLL-based PCI Express / Intel QPI clock buffer, 400 MHz max, 2:19 differential HCSL fan-out, 3.135-3.465 V supply, 0°C to 70°C, 72-VFQFPN (10x10) tray.","salesMarkdown":"## What this PCIe clock buffer does on the board The Renesas 9ZX21901BKLF is a PLL-based zero-delay buffer that takes two differential clock inputs and fans them out to nineteen HCSL outputs, all running at up to 400 MHz. It is built for Intel-platform timing trees — specifically Intel QPI and PCI Express (PCIe) reference clocks — where you need one clean source to feed multiple endpoints without skew. The 2:19 ratio means you can route separate clock trees for the root complex, switches, and downstream slots from a single device. Full differential path on both sides keeps signal integrity intact across a server motherboard. ## Supply rail and temperature — where it fits The part runs on a 3.135 V to 3.465 V supply. The operating temperature range is 0°C to 70°C. ## Lifecycle and sourcing The 9ZX21901BKLF is listed as Active with ROHS3 compliance. For a wider-temperature variant, the 9ZXL0851EKKLF (1:8 fan-out) and 9ZXL1231EKILF (1:12 fan-out) are functional peers rated -40°C to 85°C.","metaTitle":"9ZX21901BKLF PCIe Clock Buffer, 400 MHz, 2:19, 72-VFQFPN","metaDescription":"Renesas 9ZX21901BKLF PCIe/QPI clock buffer, 400 MHz, 2:19 fan-out, HCSL outputs, 0-70°C, ROHS3.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Analog & Data Acquisition"],"specifications":{"PLL":"Yes","Input":"Clock","Output":"HCSL","Package":"Tray","Main Purpose":"Intel QPI, PCI Express (PCIe)","Mounting Type":"Surface Mount","Package / Case":"72-VFQFN Exposed Pad","Frequency - Max":"400MHz","lifecycle_stage":"eol_hot","Voltage - Supply":"3.135V ~ 3.465V","Number of Circuits":"1","Ratio - Input:Output":"2:19","Operating Temperature":"0°C ~ 70°C","Supplier Device Package":"72-VFQFPN (10x10)","Differential - Input:Output":"Yes/Yes"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$7.52","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$7.52000","currency":"USD"},{"qty":10,"price":"$6.79700","currency":"USD"},{"qty":25,"price":"$6.48080","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/ea20926b811f2d31f2210615c6f391e0.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Is 9ZX21901BKLF RoHS compliant?","answer":"Yes, it is ROHS3 compliant."},{"question":"What is the equivalent part for 9ZX21901BKLF?","answer":"There is no exact pin-compatible second source listed. For a wider temperature range, the 9ZXL0851EKKLF (1:8 fan-out) and 9ZXL1231EKILF (1:12 fan-out) are functional peers with the same 400 MHz HCSL outputs and 3.3 V supply, rated -40°C to 85°C. The 9DB803DFLFT is a PCIe-only buffer (1:8) with the same 0°C to 70°C range."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/renesas/9ZX21901BKLF","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/renesas/9ZX21901BKLF 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}}