{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"CY7C1399BN-15VXCT","brand":"Infineon Technologies","brandSlug":"infineon","productSlug":"CY7C1399BN-15VXCT","canonicalUrl":"https://icboms.com/infineon/CY7C1399BN-15VXCT","factsUrl":"https://icboms.com/api/mcp/products/CY7C1399BN-15VXCT","rawCanonicalId":null},"summary":{"shortDescription":"Cypress CY7C1399BN-15VXCT, 256Kbit (32K×8) asynchronous SRAM, 15 ns access time, 3.0–3.6V supply, parallel interface, 28-BSOJ (0.300in, 7.62mm), 0°C–70°C, Tape & Reel.","salesMarkdown":"## 15 ns access time — timing margin for legacy buses The CY7C1399BN-15VXCT: The 15 ns access time matches the timing requirements of many 33 MHz bus controllers and DSPs that expect a 20 ns or faster memory cycle. At 3.3 V nominal, the part delivers address-to-data valid within 15 ns, leaving margin for board trace delays and capacitive loading. For a 50 MHz controller, the 15 ns window may be tight; a faster 10 ns or 12 ns SRAM would be a safer choice. ## Package and supply rail considerations The 28-SOJ package (0.300 inch body width, 7.62 mm) is a JEDEC-standard footprint shared by many 256Kbit and 1Mbit asynchronous SRAMs. It is not 5 V tolerant on the I/O pins; level translation is required if interfacing with a 5 V logic family.","metaTitle":"CY7C1399BN-15VXCT Cypress 256Kbit Async SRAM, 15 ns, 28-SOJ","metaDescription":"Cypress CY7C1399BN-15VXCT 256Kbit (32Kx8) asynchronous SRAM with 15 ns access time, 3.0-3.6V supply, 28-SOJ package, 0°C-70°C.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Obsolete","categoryPath":["Memory (DRAM / SRAM / Flash / EEPROM)"],"specifications":{"title":"CY7C1399BN-15VXCT","Package":"Tape & Reel (TR)","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":"$0.6600","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/4fe0334a2d8dfed4307918169f522b7a.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/CY7C1399BN-15VXCT/alternatives.json"},"ai":{"faq":[{"question":"Is CY7C1399BN-15VXCT obsolete?","answer":"Yes, Cypress has listed the CY7C1399BN-15VXCT as Obsolete. No official replacement part number is provided in the available records. For production continuity, buyers should evaluate a pin-compatible 256Kbit asynchronous SRAM from a current manufacturer."},{"question":"What is a drop-in replacement for CY7C1399BN-15VXCT?","answer":"A functionally equivalent 256Kbit (32K x 8) asynchronous SRAM in a 28-SOJ package with 15 ns or faster access time and a 3.3 V supply would be the closest match. Verify pinout and timing compatibility against the original datasheet before substituting."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/infineon/CY7C1399BN-15VXCT","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/infineon/CY7C1399BN-15VXCT 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}}