{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"CY7C1399B-12ZXC","brand":"Infineon Technologies","brandSlug":"infineon","productSlug":"CY7C1399B-12ZXC","canonicalUrl":"https://icboms.com/infineon/CY7C1399B-12ZXC","factsUrl":"https://icboms.com/api/mcp/products/CY7C1399B-12ZXC","rawCanonicalId":null},"summary":{"shortDescription":"Infineon Technologies CY7C1399B-12ZXC asynchronous SRAM, 256Kbit (32K x 8), 12 ns access time, 3V–3.6V supply, 28-TSSOP (0.465\", 11.80mm width), 0°C to 70°C, tray.","salesMarkdown":"## What the 12 ns access time means for your bus The CY7C1399B-12ZXC is a 256Kbit asynchronous SRAM organized as 32K x 8 bits, with a 12 ns access time that sets the fastest read cycle the CPU can expect without wait states. In a 3.3 V system, that 12 ns window covers address-to-data valid — if your controller's memory bus runs at 50 MHz (20 ns cycle), this part leaves 8 ns of margin for address hold and data setup, which is tight but workable for a single-cycle read. ## Package and hand-solderability No BGA, no hidden pads; you can breadboard it on a SOIC adapter if you're prototyping. The commercial temperature range (0°C to 70°C) limits it to indoor, climate-controlled environments — not suitable for engine bays or outdoor enclosures without active cooling. ## Obsolete — sourcing reality Infineon lists this part as Obsolete. If you're designing a new board, look for a current-generation async SRAM in the same 28-TSOP footprint — the 12 ns speed grade and 3.3 V supply are common across many active parts.","metaTitle":"Infineon CY7C1399B-12ZXC 256Kbit Async SRAM, 12ns, 28-TSSOP","metaDescription":"CY7C1399B-12ZXC 256Kbit (32Kx8) async SRAM, 12ns access, 3V-3.6V, 28-TSSOP. Obsolete — sourced to order against RFQ through independent channels.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Obsolete","categoryPath":["Memory (DRAM / SRAM / Flash / EEPROM)"],"specifications":{"title":"CY7C1399B-12ZXC","Package":"Tray","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":"$1.3900","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/a01599d373db306f08880242de2c1d40.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/CY7C1399B-12ZXC/alternatives.json"},"ai":{"faq":[{"question":"How can I order CY7C1399B-12ZXC or check stock?","answer":"This part is obsolete and sourced through independent distribution."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/infineon/CY7C1399B-12ZXC","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/infineon/CY7C1399B-12ZXC when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-21T02:07:29.583Z","lastPublished":"2026-07-21T02:07:29.583Z","indexable":true}}