{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"CY8C3446AXI-099","brand":"Infineon Technologies","brandSlug":"infineon","productSlug":"CY8C3446AXI-099","canonicalUrl":"https://icboms.com/infineon/CY8C3446AXI-099","factsUrl":"https://icboms.com/api/mcp/products/CY8C3446AXI-099","rawCanonicalId":null},"summary":{"shortDescription":"Infineon/Cypress PSoC 3 CY8C34xx series, CY8C3446AXI-099, 8-bit 8051 MCU, 50 MHz, 64 KB Flash, 8 KB RAM, 2 KB EEPROM, CapSense, USB, 62 I/O, 100-TQFP, -40°C to 85°C.","salesMarkdown":"## PSoC 3 CY8C3446AXI-099 — 8051 MCU with integrated analog and CapSense The Infineon (formerly Cypress) CY8C3446AXI-099 is an 8-bit PSoC 3 microcontroller built around an 8051 core clocked at 50 MHz. It carries 64 KB of Flash program memory, 8 KB of SRAM, and 2 KB of EEPROM — enough for a firmware image with CapSense tuning tables, calibration constants, and a modest application stack. The part integrates a 16-channel 12-bit ADC, dual 8-bit DACs, and a full set of programmable analog blocks, making it a genuine mixed-signal controller rather than a pure digital MCU. Packaged in a 100-pin LQFP (also supplied as 100-TQFP), the part is rated for industrial temperature from -40°C to 85°C. Typical applications include industrial control panels with HMI, capacitive touch interfaces on appliances, portable medical instruments, and sensor hubs that need both analog front-end and USB connectivity in one package. ## 50 MHz 8051 core — throughput for control loops and CapSense scanning The 50 MHz clock on the 8051 core determines how fast the CapSense scan completes, how many sensor channels can be time-multiplexed, and the USB packet-handling rate. For a typical 16-button capacitive touch panel, the scan rate at 50 MHz leaves enough headroom for the main control loop and communications without stalling. The 8-bit architecture is code-density efficient for bit-banged protocols and state machines, but a 32-bit ARM Cortex-M0 sibling (CY8C4245LQI-483 at 48 MHz) would edge ahead on math-heavy filtering or floating-point tasks. ## Wide supply range and industrial temperature — what it means for the BOM The 1.71 V to 5.5 V supply range is a genuine BOM simplification. The -40°C to 85°C temperature grade covers factory-floor enclosures, outdoor telecom cabinets, and automotive cabin-adjacent modules.","metaTitle":"CY8C3446AXI-099 PSoC 3 MCU, 8051, 50MHz, 64KB Flash","metaDescription":"Infineon/Cypress CY8C3446AXI-099 8-bit 8051 PSoC 3 MCU, 50MHz, 64KB Flash, 8KB RAM, 2KB EEPROM, CapSense, USB, 62 I/O, 100-TQFP. Active production.","metaKeywords":null},"attributes":{"series":"PSOC® 3 CY8C34xx","packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Discrete Semiconductors"],"specifications":{"Speed":"50MHz","Series":"PSOC® 3 CY8C34xx","Package":"Tray","RAM Size":"8K x 8","Core Size":"8-Bit","EEPROM Size":"2K x 8","Peripherals":"CapSense, DMA, LCD, POR, PWM, WDT","Connectivity":"EBI/EMI, I²C, LINbus, SPI, UART/USART, USB","Mounting Type":"Surface Mount","Number of I/O":"62","Core Processor":"8051","Package / Case":"100-LQFP","Data Converters":"A/D 16x12b; D/A 2x8b","Oscillator Type":"Internal","lifecycle_stage":"eol_hot","Program Memory Size":"64KB (64K x 8)","Program Memory Type":"FLASH","Operating Temperature":"-40°C ~ 85°C (TA)","Supplier Device Package":"100-TQFP (14x14)","Voltage - Supply (Vcc/Vdd)":"1.71V ~ 5.5V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$14.1","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$14.10000","currency":"USD"},{"qty":10,"price":"$12.96300","currency":"USD"},{"qty":25,"price":"$12.42560","currency":"USD"},{"qty":90,"price":"$10.94789","currency":"USD"},{"qty":270,"price":"$10.41059","currency":"USD"},{"qty":450,"price":"$9.73893","currency":"USD"},{"qty":990,"price":"$8.93295","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/033a7647e9725ad6556608a72e8ec755.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the maximum operating frequency of CY8C3446AXI-099?","answer":"The 8051 core runs at 50 MHz. That clock rate sets the throughput ceiling for CapSense scanning, USB packet handling, and control-loop update rates."},{"question":"What are the differences between CY8C3446AXI-099 and CY8C3445AXI-099?","answer":"The CY8C3446AXI-099 carries 64 KB of Flash program memory, while the CY8C3445AXI-099 variant is configured with 32 KB. Pinout and peripheral set are identical across the density options — the only difference is the Flash array size, which determines the firmware image budget."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/infineon/CY8C3446AXI-099","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/infineon/CY8C3446AXI-099 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}}