{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"CY7C4271-15AC","brand":"Infineon Technologies","brandSlug":"infineon","productSlug":"CY7C4271-15AC","canonicalUrl":"https://icboms.com/infineon/CY7C4271-15AC","factsUrl":"https://icboms.com/api/mcp/products/CY7C4271-15AC","rawCanonicalId":null},"summary":{"shortDescription":"Infineon Technologies CY7C series synchronous FIFO, CY7C4271-15AC, 288K (32K x 9), 66.7 MHz data rate, 10 ns access, 4.5-5.5 V supply, 35 mA max, 0°C to 70°C, 32-TQFP (7x7 mm), surface mount.","salesMarkdown":"## 66.7 MHz synchronous FIFO — what the clock and access time mean on the bus The CY7C4271-15AC is a synchronous FIFO from the CY7C series, organized as 32K x 9 bits for a total of 288 Kbit storage. The 66.7 MHz clock rate means the FIFO can accept a write or deliver a read on every clock edge at that frequency, so the peak data throughput is 66.7 million 9-bit words per second — enough to buffer a sustained burst from a fast ADC or a DSP link without dropping samples. The 10 ns access time is the delay from the read clock edge to valid data on the output bus. In a pipelined system, this latency adds to the combinational path between the FIFO and the receiving device; a 10 ns window means the downstream logic must sample the data within that window after the read clock, which is manageable with a 66.7 MHz (15 ns period) clock when the board trace lengths are kept short. The 9-bit width (32K x 9) is the key differentiator from standard 8-bit FIFOs — the extra bit typically carries a parity flag or a ninth data bit for 9-bit DSP word formats. If your bus is 8-bit only, the ninth pin floats or ties low, but the part still functions; if you need parity, the ninth bit is already wired. ## 32-TQFP (7x7 mm) — rework and board-fit realities The 32-TQFP package with a 7x7 mm body and 0.80 mm pitch is hand-reworkable with a hot-air station if the pad layout is clean and the adjacent components are not too dense. That means the part runs hotter than an equivalent QFN with an exposed paddle; keep airflow across the package in the system design. Surface-mount only — no through-hole variant. The 32-TQFP footprint is standard JEDEC; the 0.80 mm pitch is fine enough that a solder bridge between adjacent pins is possible with a poorly profiled reflow. A stencil with 0.15 mm thickness and a 1:1 aperture-to-pad ratio is the starting point for the assembly house. ## Obsolete — sourcing through independent surplus channels The CY7C4271-15AC is marked obsolete by Infineon Technologies (formerly Cypress Semiconductor). Quantities are lot-specific and confirmed at RFQ; no stock-holding claim is made here. ## Supply and expansion — depth, width, and programmable flags The 35 mA maximum supply current at 66.7 MHz is modest for a synchronous FIFO; the power dissipation stays under 200 mW at 5 V, so no heatsinking is needed. Depth and width expansion are supported without external logic — multiple CY7C4271 devices can be cascaded in a daisy-chain configuration to build deeper or wider buffers. The programmable flags (almost-full, almost-empty) let the system set threshold levels via the flag pins, so the host controller can pre-emptively throttle writes or reads before the FIFO hits its hard limits. This part is intended for indoor, temperature-controlled equipment — not automotive, industrial, or outdoor deployment.","metaTitle":"CY7C4271-15AC Infineon FIFO, 288K, 66.7MHz, 32-TQFP","metaDescription":"CY7C4271-15AC synchronous FIFO, 288K (32K x 9), 66.7 MHz, 10 ns access, 4.5-5.5 V, 32-TQFP. Obsolete — sourced to order through independent channels.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Obsolete","categoryPath":["Memory (DRAM / SRAM / Flash / EEPROM)"],"specifications":{"title":"CY7C4271-15AC","Series":"CY7C","Package":"Bag","Function":"Synchronous","Data Rate":"66.7MHz","Access Time":"10ns","Memory Size":"288K (32K x 9)","FWFT Support":"No","Mounting Type":"Surface Mount","Expansion Type":"Depth, Width","Package / Case":"32-TQFP","Bus Directional":"Uni-Directional","lifecycle_stage":"eol_hot","Voltage - Supply":"4.5 V ~ 5.5 V","Base Product Number":"7C4271","Operating Temperature":"0°C ~ 70°C","Retransmit Capability":"No","Current - Supply (Max)":"35mA","Supplier Device Package":"32-TQFP (7x7)","Programmable Flags Support":"Yes"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/20c5e88916ab8bb4d871fe92ddbb00ea.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Where can I buy the CY7C4271-15AC or check availability?","answer":"The CY7C4271-15AC is obsolete and sourced through independent surplus channels. No stock-holding claim is made here."},{"question":"What does the 9-bit width (32K x 9) mean for my design?","answer":"The 9-bit organization stores a ninth data bit alongside each byte — commonly used for parity checking or 9-bit DSP word formats. If your bus is standard 8-bit, the ninth pin can be left unconnected or tied to a known state; the FIFO still functions as a 32K x 8 buffer."},{"question":"Can I rework the 32-TQFP package by hand?","answer":"Yes — the 0.80 mm pitch and 7x7 mm body are hand-reworkable with a hot-air station if the board layout provides clearance around the part. The package has no exposed thermal pad, so the die heat exits through the leads; keep airflow across the body during operation."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/infineon/CY7C4271-15AC","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/infineon/CY7C4271-15AC when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-21T02:19:55.828Z","lastPublished":"2026-07-21T02:19:55.828Z","indexable":true}}