{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"CY7C1399B-15VXC","brand":"Infineon Technologies","brandSlug":"infineon","productSlug":"CY7C1399B-15VXC","canonicalUrl":"https://icboms.com/infineon/CY7C1399B-15VXC","factsUrl":"https://icboms.com/api/mcp/products/CY7C1399B-15VXC","rawCanonicalId":null},"summary":{"shortDescription":"Infineon Technologies CY7C1399B-15VXC asynchronous SRAM, 256Kbit (32K x 8), 15 ns access time, 3.0–3.6 V supply, 28-BSOJ (7.62 mm body width), commercial 0°C–70°C, tube, obsolete.","salesMarkdown":"## 15 ns access time and bus timing The CY7C1399B-15VXC: The 15 ns access time means the SRAM presents valid data on the bus within 15 ns of the address being stable — this sets the read-cycle timing margin for the memory controller or FPGA interface. Write cycle time is also 15 ns, so the part can complete a full read or write operation in a single 66 MHz clock cycle with zero wait states, provided the controller's output hold time is met. ## SOJ package — rework and board-fit The 28-SOJ package (JEDEC MO-061, 300 mil body) has gull-wing leads on a 1.27 mm pitch — it is hand-solderable with a fine-tip iron and reworkable under hot air without lifting pads, unlike finer-pitch QFPs. ## Obsolete — sourcing reality No pin-compatible direct replacement exists from Infineon — a functional equivalent would require a different package or speed grade, and a board spin may be needed.","metaTitle":"Infineon CY7C1399B-15VXC 256Kbit SRAM, 15ns, 28-SOJ","metaDescription":"Obsolete Infineon CY7C1399B-15VXC asynchronous SRAM, 256Kbit (32K x 8), 15ns access, 3.0-3.6V, 28-SOJ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Obsolete","categoryPath":["Memory (DRAM / SRAM / Flash / EEPROM)"],"specifications":{"title":"CY7C1399B-15VXC","Package":"Tube","Technology":"SRAM - Asynchronous","Access Time":"15 ns","Memory Size":"256Kbit","Memory Type":"Volatile","Memory Format":"SRAM","Mounting Type":"Surface Mount","Package / Case":"28-BSOJ (0.300\\\", 7.62mm Width)","lifecycle_stage":"eol_hot","Memory Interface":"Parallel","Voltage - Supply":"3V ~ 3.6V","Base Product Number":"CY7C1399","Memory Organization":"32K x 8","Operating Temperature":"0°C ~ 70°C (TA)","Supplier Device Package":"28-SOJ","Write Cycle Time - Word, Page":"15ns"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.0633","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/bcd7f180701279273c0e5324930a5244.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/CY7C1399B-15VXC/alternatives.json"},"ai":{"faq":[{"question":"Is CY7C1399B-15VXC obsolete?","answer":"Yes, CY7C1399B-15VXC is officially obsolete per the manufacturer. No further production is planned; supply is limited to existing channel inventory."},{"question":"What is the replacement for CY7C1399B-15VXC?","answer":"There is no official pin-compatible replacement listed by Cypress for this exact density and speed grade. For a functional equivalent, look for a 32K x 8 asynchronous SRAM in a 28-SOJ package with 15 ns access time and 3.3 V supply — verify the footprint and timing before substituting."},{"question":"What are the specifications of CY7C1399B-15VXC?","answer":"256Kbit (32K x 8) asynchronous parallel SRAM, 15 ns access time, 3.0–3.6 V supply, 28-BSOJ (7.62 mm body width) package, 0°C to 70°C operating temperature, parallel interface."},{"question":"What package is CY7C1399B-15VXC in?","answer":"28-BSOJ (0.300\", 7.62 mm width) surface-mount package, also referred to as 28-SOJ."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/infineon/CY7C1399B-15VXC","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/infineon/CY7C1399B-15VXC when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-21T02:07:33.282Z","lastPublished":"2026-07-21T02:07:33.282Z","indexable":true}}