{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"CY7C429-20JXCT","brand":"Infineon Technologies","brandSlug":"infineon","productSlug":"CY7C429-20JXCT","canonicalUrl":"https://icboms.com/infineon/CY7C429-20JXCT","factsUrl":"https://icboms.com/api/mcp/products/CY7C429-20JXCT","rawCanonicalId":null},"summary":{"shortDescription":"Infineon Technologies CY7C series asynchronous FIFO, CY7C429-20JXCT, 18K (2K x 9), 50 MHz data rate, 20 ns access time, 4.5 V to 5.5 V supply, 32-PLCC (11.43x13.97 mm) J-lead, 0°C to 70°C, retransmit capable, tape and reel.","salesMarkdown":"## 18K FIFO at 50 MHz — the access-time ceiling The CY7C429-20JXCT is an asynchronous FIFO from the CY7C family, organized 2K words deep by 9 bits wide. It clocks at a 50 MHz data rate with a 20 ns access time — the access window determines how fast the read pointer can retrieve a word after the read-enable strobe, setting the real throughput in a burst transfer. The 9-bit width accommodates an eighth parity or control bit alongside an 8-bit byte, common in telecom or data-acquisition buffers where a sideband flag travels with the data word. ## Retransmit and expansion for deep buffering Retransmit capability lets the FIFO re-read data from a marker without a full reset — useful in retry protocols or data recovery after a transmission error. Expansion support allows depth- or width-cascading multiple devices to build a larger buffer array without external glue logic. The 55 mA maximum supply current at 5 V is typical for a 50 MHz FIFO in this density — the active current scales linearly with clock rate; a slower system clock reduces the draw proportionally. Infineon lists the CY7C429-20JXCT as obsolete. The commercial temperature grade (0°C to 70°C,) restricts the part to indoor or controlled environments — not rated for industrial or automotive ambient. ## Supply rail and board integration The J-lead PLCC footprint is surface-mount but requires a socket or reflow profile compatible with the 32-lead body (11.43 x 13.97 mm). No programmable flags or FWFT (First-Word Fall-Through) support — the empty/full flag timing is fixed. For designs that need programmable almost-empty or almost-full thresholds, a different FIFO variant is required.","metaTitle":"Infineon CY7C429-20JXCT Async FIFO, 18K, 50MHz, 20ns","metaDescription":"CY7C429-20JXCT asynchronous FIFO, 18K (2Kx9), 50MHz, 20ns access, 4.5-5.5V, 32-PLCC, 0-70°C, retransmit capable. Obsolete — sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Obsolete","categoryPath":["Memory (DRAM / SRAM / Flash / EEPROM)"],"specifications":{"title":"CY7C429-20JXCT","Series":"CY7C","Package":"Tape & Reel (TR)","Function":"Asynchronous","Data Rate":"50MHz","Access Time":"20ns","Memory Size":"18K (2K 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":"7C429","Operating Temperature":"0°C ~ 70°C","Retransmit Capability":"Yes","Current - Supply (Max)":"55mA","Supplier Device Package":"32-PLCC (11.43x13.97)","Programmable Flags Support":"No"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/29e2525145ef91bf674ce58bf7fd0585.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the closest pin-compatible alternative to the CY7C429-20JXCT?","answer":"No pin-compatible alternative is recorded in the manufacturer's cross-reference. The CY7C family includes other 18K FIFOs in the same 32-PLCC package, but pin compatibility depends on the specific function (depth, width, retransmit, flags). Verify the replacement against the original BOM position before committing."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/infineon/CY7C429-20JXCT","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/infineon/CY7C429-20JXCT when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-21T02:20:22.690Z","lastPublished":"2026-07-21T02:20:22.690Z","indexable":true}}