{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"CY7C1399B-12VC","brand":"Infineon Technologies","brandSlug":"infineon","productSlug":"CY7C1399B-12VC","canonicalUrl":"https://icboms.com/infineon/CY7C1399B-12VC","factsUrl":"https://icboms.com/api/mcp/products/CY7C1399B-12VC","rawCanonicalId":null},"summary":{"shortDescription":"Infineon Technologies CY7C1399B-12VC asynchronous SRAM, 256Kbit (32K x 8), 12 ns access time, 3V–3.6V supply, 28-BSOJ (0.300\", 7.62mm) tube package, commercial temperature 0°C–70°C.","salesMarkdown":"## 12 ns asynchronous SRAM — 28-SOJ footprint and board-fit The CY7C1399B-12VC is a 256 Kbit asynchronous SRAM organized 32K x 8, with a 12 ns access time that sets the read-cycle floor for the memory bus — the processor or DMA controller must tolerate 12 ns from address valid to data valid on the parallel interface. No pin-compatible replacement from the original manufacturer exists — a board spin to a different package or a different memory type is required for new production. ## Parallel interface and bus timing The memory interface is Parallel — address and data share the bus in a standard SRAM read/write cycle. The 12 ns access time and 12 ns write-cycle time mean the part supports bus speeds up to roughly 83 MHz in a zero-wait-state design, though the actual throughput depends on the controller's address-to-data setup and hold margins. As an asynchronous SRAM, it requires no refresh clock — the data persists as long as supply is within the 3 V–3.6 V range. This simplifies the glue logic compared to a synchronous SRAM or PSRAM, at the cost of higher standby current than a comparable DRAM.","metaTitle":"CY7C1399B-12VC Infineon 256Kbit Async SRAM, 12ns, 28-SOJ","metaDescription":"CY7C1399B-12VC 256Kbit asynchronous SRAM, 12ns access, 3V-3.6V, 28-SOJ. Obsolete — sourced to order against RFQ through independent distribution.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Obsolete","categoryPath":["Memory (DRAM / SRAM / Flash / EEPROM)"],"specifications":{"title":"CY7C1399B-12VC","Package":"Tube","Technology":"SRAM - Asynchronous","Access Time":"12 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":"12ns"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/ece7e68f50620eb89e0b3d7eb36684f4.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the closest pin-compatible alternative to CY7C1399B-12VC?","answer":"There is no official pin-compatible successor from Infineon. A functionally equivalent 32K x 8 asynchronous SRAM in a 28-SOJ package from another vendor (e.g., ISSI, Alliance Memory, or Renesas) may fit the same footprint, but pin compatibility must be verified against the specific vendor's datasheet — the JEDEC SOJ-28 standard is not universal across all manufacturers."},{"question":"What compliance documentation does Infineon provide for CY7C1399B-12VC?","answer":"The part is an obsolete commercial-temperature SRAM; compliance documentation would be limited to what Infineon published at the time of production. Confirm with the supplier at RFQ."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/infineon/CY7C1399B-12VC","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/infineon/CY7C1399B-12VC when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-21T02:07:33.727Z","lastPublished":"2026-07-21T02:07:33.727Z","indexable":true}}