{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"557G-05ALF","brand":"Renesas Electronics","brandSlug":"renesas","productSlug":"557G-05ALF","canonicalUrl":"https://icboms.com/renesas/557G-05ALF","factsUrl":"https://icboms.com/api/mcp/products/557G-05ALF","rawCanonicalId":null},"summary":{"shortDescription":"IDT 557G-05ALF, PCI Express (PCIe) clock source IC, PLL Yes, 1:4 fanout, 200MHz max, HCSL/LVDS outputs, 3.135V-3.465V supply, 20-TSSOP, 0°C to 70°C.","salesMarkdown":"## PCIe clock source with 1:4 fanout — what it does The Renesas (formerly IDT) 557G-05ALF is a PCI Express (PCIe) clock source IC that takes a single-ended clock or crystal input and delivers four differential HCSL or LVDS outputs at up to 200 MHz. The internal PLL cleans up the incoming reference and generates the low-jitter clock family required by PCIe root complexes, switches, and endpoints. The 1:4 fanout ratio means one input feeds four output lanes — useful for distributing a reference clock across a small PCIe switch or multiple downstream devices without adding a separate fanout buffer. ## 200 MHz ceiling and differential output — what they mean for the bus The 200 MHz maximum frequency covers PCIe Gen 1 through Gen 3 reference clock requirements (100 MHz typical, with spread-spectrum modulation where needed). The differential output (HCSL or LVDS) is the standard PCIe clock signaling — the 557G-05ALF accepts a single-ended input and converts it to the differential format the PCIe PHY expects, so you don't need an external single-ended-to-differential converter. The No/Yes differential flag means the input is single-ended (clock or crystal) while all four outputs are differential. ## Supply and temperature — commercial range, 3.3 V rail The supply range is 3.135 V to 3.465 V — a tight 3.3 V ±5% window typical of PCIe clock generators. The operating temperature is 0°C to 70°C, so this part is specified for commercial/indoor equipment (servers, switches, desktop PCs, test gear) rather than industrial or outdoor environments. If the design needs -40°C operation, a different PCIe clock part with industrial temperature rating would be needed. ## Package and mounting — 20-TSSOP, surface-mount Housed in a 20-TSSOP (4.40 mm width) surface-mount package. The supplier device package is 20-TSSOP. This is a standard fine-pitch SSOP footprint — no exposed pad, so thermal dissipation is through the leads only. The shipping medium is tube, not tape-and-reel, which matters for automated pick-and-place line setup (tube-fed feeders or manual loading). ## Lifecycle and compliance — active, ROHS3 The 557G-05ALF is listed as Active in production status and ROHS3 compliant.","metaTitle":"IDT 557G-05ALF PCIe Clock Generator, 200MHz, 20-TSSOP","metaDescription":"IDT 557G-05ALF PCI Express clock source IC. 200MHz max, 1:4 fanout, HCSL/LVDS outputs, 3.3V supply, 20-TSSOP. Active, ROHS3 compliant.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Clock & Timing ICs"],"specifications":{"PLL":"Yes","Input":"Clock, Crystal","Output":"HCSL, LVDS","Package":"Tube","Main Purpose":"PCI Express (PCIe)","Mounting Type":"Surface Mount","Package / Case":"20-TSSOP (0.173\\\", 4.40mm Width)","Frequency - Max":"200MHz","lifecycle_stage":"eol_hot","Voltage - Supply":"3.135V ~ 3.465V","Number of Circuits":"1","Ratio - Input:Output":"1:4","Operating Temperature":"0°C ~ 70°C","Supplier Device Package":"20-TSSOP","Differential - Input:Output":"No/Yes"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$4.04","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$4.24000","currency":"USD"},{"qty":10,"price":"$3.80900","currency":"USD"},{"qty":25,"price":"$3.60120","currency":"USD"},{"qty":100,"price":"$3.12120","currency":"USD"},{"qty":250,"price":"$2.96112","currency":"USD"},{"qty":500,"price":"$2.65700","currency":"USD"},{"qty":1000,"price":"$2.52170","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/2b117581b17abc874290aad1d1bd9f8c.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Is 557G-05ALF RoHS compliant?","answer":"Yes, the 557G-05ALF is ROHS3 compliant."},{"question":"What is the maximum frequency of 557G-05ALF?","answer":"The maximum output frequency is 200 MHz, covering PCIe Gen 1 through Gen 3 reference clock requirements."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/renesas/557G-05ALF","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/renesas/557G-05ALF 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}}