{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"CY7C4291-10JXC","brand":"Infineon Technologies","brandSlug":"infineon","productSlug":"CY7C4291-10JXC","canonicalUrl":"https://icboms.com/infineon/CY7C4291-10JXC","factsUrl":"https://icboms.com/api/mcp/products/CY7C4291-10JXC","rawCanonicalId":null},"summary":{"shortDescription":"Infineon Technologies CY7C series synchronous FIFO memory, CY7C4291-10JXC, 1.125M (128K x 9), 100MHz data rate, 8ns access time, 32-PLCC (11.43x13.97mm) J-lead surface-mount package.","salesMarkdown":"## 128K x 9 synchronous FIFO — timing and capacity for buffering The CY7C4291-10JXC is a synchronous FIFO memory from the CY7C series, organized as 128K words by 9 bits (1.125 Mbit total capacity). It clocks at 100 MHz with an 8 ns access time, meaning the read/write cycle completes within one clock period — no wait states for the controller at that speed. The 9-bit width (8 data + 1 parity or control bit) suits applications where a ninth bit carries a flag alongside the data word, common in telecom or datacom framer interfaces. Depth expansion is supported via cascading multiple devices, and width expansion is also on the datasheet. ## Package and reflow — 32-PLCC J-lead on a 5 V rail Housed in a 32-lead PLCC (J-lead) package, 11.43 x 13.97 mm body, the part is surface-mount but the J-lead geometry demands a specific solder-paste stencil aperture to avoid tombstoning during reflow. The J-lead heel fillet is critical for joint reliability; a 0.15 mm stencil thickness with a 1:1 aperture-to-lead-footprint ratio is typical. Maximum supply current is 40 mA, so the thermal dissipation in the PLCC at 70°C ambient is manageable without forced airflow, but the junction temperature should be checked against the package's RθJA for the specific board layout. Infineon (formerly Cypress) has marked the CY7C4291-10JXC as Obsolete. The part is not recommended for new designs; existing BOM lines should plan for a replacement or secure a last-time-buy inventory. Confirm the date code and condition (new original, not refurbished) at quote time.","metaTitle":"CY7C4291-10JXC Infineon Sync FIFO, 128Kx9, 100MHz, 32-PLCC","metaDescription":"CY7C4291-10JXC synchronous FIFO memory, 1.125 Mbit (128Kx9), 100 MHz data rate, 8 ns access time, 32-PLCC. Obsolete — sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Obsolete","categoryPath":["Memory (DRAM / SRAM / Flash / EEPROM)"],"specifications":{"title":"CY7C4291-10JXC","Series":"CY7C","Package":"Tube","Function":"Synchronous","Data Rate":"100MHz","Access Time":"8ns","Memory Size":"1.125M (128K x 9)","FWFT Support":"No","Mounting Type":"Surface Mount","Expansion Type":"Depth, Width","Package / Case":"32-LCC (J-Lead)","Bus Directional":"Uni-Directional","lifecycle_stage":"eol_hot","Voltage - Supply":"4.5 V ~ 5.5 V","Base Product Number":"7C4291","Operating Temperature":"0°C~70°C","Retransmit Capability":"No","Current - Supply (Max)":"40mA","Supplier Device Package":"32-PLCC (11.43x13.97)","Programmable Flags Support":"Yes"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/f9eadbcc6dc2c00ce0d2c65bf06737de.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the memory depth and width of CY7C4291-10JXC?","answer":"It is organized as 128K words by 9 bits (1.125 Mbit total). The 9-bit width includes one extra bit per word, often used for parity or a control flag alongside the 8 data bits."},{"question":"What data rate and access time does CY7C4291-10JXC support?","answer":"The synchronous interface operates at 100 MHz with an 8 ns access time. This means data is read or written on each clock edge, and the first word appears 8 ns after the read request."},{"question":"Does CY7C4291-10JXC support programmable flags?","answer":"Yes — it supports programmable flags for FIFO status (almost-full, almost-empty, etc.), allowing the controller to manage flow control without polling the fill level."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/infineon/CY7C4291-10JXC","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/infineon/CY7C4291-10JXC when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-21T02:20:22.519Z","lastPublished":"2026-07-21T02:20:22.519Z","indexable":true}}