{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"CY7C1399BN-12ZXCT","brand":"Infineon Technologies","brandSlug":"infineon","productSlug":"CY7C1399BN-12ZXCT","canonicalUrl":"https://icboms.com/infineon/CY7C1399BN-12ZXCT","factsUrl":"https://icboms.com/api/mcp/products/CY7C1399BN-12ZXCT","rawCanonicalId":null},"summary":{"shortDescription":"Infineon (Cypress) CY7C1399BN-12ZXCT, 256Kbit asynchronous SRAM, 32K x 8 organization, 12 ns access time, 3V–3.6V supply, parallel interface, 28-TSOP I surface-mount package, 0°C–70°C, Tape & Reel.","salesMarkdown":"## 256Kbit async SRAM, 12 ns — what you need to know The Infineon CY7C1399BN-12ZXCT is a 256Kbit asynchronous SRAM organized 32K x 8, with a 12 ns access time and a 3V–3.6V supply range. This is a volatile memory — data is lost when power drops below the minimum supply. ## 12 ns access time — bus timing margin The 12 ns access time and 12 ns write cycle time mean this SRAM can keep up with a 50–66 MHz bus without wait states, assuming reasonable PCB trace lengths. If your controller's memory interface runs faster than that, you'll need to budget for the access time in your timing closure — or look at a pipelined synchronous SRAM. ## 3V–3.6V supply — no 5V tolerance The I/O pins track VDD — applying 5V to any pin will exceed the absolute maximum ratings. If your legacy design runs at 5V, you need a different SRAM or a voltage translation bridge. ## Package: 28-TSOP I — rework and footprint The 28-TSOP I package is a thin small-outline package with a 0.465-inch body width. The TSOP I footprint is shared by many 32K x 8 async SRAMs, which helps if you're looking for a drop-in replacement. This part is formally obsolete per the manufacturer. That means new-manufacture stock is gone; remaining inventory is limited to what's in the distribution channel or on the surplus market. If you have an active BOM line with this order code, the window for factory-origin parts is closed — procurement now depends on independent-distributor stock, which is finite and quoted to order.","metaTitle":"Infineon CY7C1399BN-12ZXCT 256Kbit Async SRAM, 12 ns","metaDescription":"Infineon (Cypress) CY7C1399BN-12ZXCT is a 256Kbit asynchronous SRAM, 32K x 8, 12 ns access time, 3V–3.6V supply, 28-TSOP I.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Obsolete","categoryPath":["Memory (DRAM / SRAM / Flash / EEPROM)"],"specifications":{"title":"CY7C1399BN-12ZXCT","Package":"Tape & Reel (TR)","Technology":"SRAM - Asynchronous","Access Time":"12 ns","Memory Size":"256Kbit","Memory Type":"Volatile","Memory Format":"SRAM","Mounting Type":"Surface Mount","Package / Case":"28-TSSOP (0.465\\\", 11.80mm 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-TSOP I","Write Cycle Time - Word, Page":"12ns"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/fef115cca883337317066bfca634e597.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Is CY7C1399BN-12ZXCT obsolete?","answer":"Yes, Infineon lists this part as obsolete. If you need a drop-in replacement, look for a 32K x 8 asynchronous SRAM in a 28-TSOP I package with a 12 ns or faster access time and a 3V–3.6V supply — several vendors offer pin-compatible parts, but verify the exact timing and supply specs against your design."},{"question":"Can CY7C1399BN-12ZXCT be used in a 5V system?","answer":"No. Applying 5V to the supply or any pin will exceed the absolute maximum ratings and damage the device."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/infineon/CY7C1399BN-12ZXCT","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/infineon/CY7C1399BN-12ZXCT 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}}