{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"CY8C3866AXI-040","brand":"Infineon Technologies","brandSlug":"infineon","productSlug":"CY8C3866AXI-040","canonicalUrl":"https://icboms.com/infineon/CY8C3866AXI-040","factsUrl":"https://icboms.com/api/mcp/products/CY8C3866AXI-040","rawCanonicalId":null},"summary":{"shortDescription":"Infineon Technologies PSoC® 3 CY8C38xx 8-bit MCU, CY8C3866AXI-040, 8051 core at 67 MHz, 64 KB flash, 8 KB RAM, 2 KB EEPROM, 100-LQFP tray.","salesMarkdown":"## 8051 core at 67 MHz with programmable analog The CY8C3866AXI-040 runs an 8051 core at 67 MHz — the throughput ceiling for deterministic control loops and legacy 8051 toolchains. The 64 KB flash and 8 KB RAM partition leaves headroom for a CapSense library, a USB stack, and a CANopen node in a single part. The 16-channel 20-bit delta-sigma ADC array is the standout analog peripheral: it resolves sensor signals that would otherwise need an external ADC and a separate reference. The four 8-bit DACs handle analog set-point generation or waveform output without an external converter. ## Peripheral set for mixed-signal control CapSense capacitive touch sensing, CANbus, USB, I²C, SPI, and UART/USART are all on-chip — the part replaces a discrete MCU plus a separate touch controller and a CAN transceiver in a single 100-pin package. The 62 I/O lines map to the 100-LQFP (14x14 mm) footprint. The DMA engine moves data between peripherals and memory without CPU intervention, critical for USB isochronous transfers or high-rate ADC captures. ## Supply and temperature envelope The industrial temperature grade (-40°C to 85°C) qualifies the part for factory-floor PLCs, outdoor sensor nodes, and under-hood automotive auxiliary modules.","metaTitle":"Infineon CY8C3866AXI-040 PSoC 3 MCU, 67 MHz, 64 KB Flash","metaDescription":"Active-production Infineon CY8C3866AXI-040 PSoC 3 MCU: 8051 core at 67 MHz, 64 KB flash, 8 KB RAM, 16-channel 20-bit ADC, CAN/USB/CapSense.","metaKeywords":null},"attributes":{"series":"PSOC® 3 CY8C38xx","packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Microcontrollers & Processors (MCU / MPU / DSP)"],"specifications":{"Speed":"67MHz","Series":"PSOC® 3 CY8C38xx","Package":"Tray","RAM Size":"8K x 8","Core Size":"8-Bit","EEPROM Size":"2K x 8","Peripherals":"CapSense, DMA, LCD, POR, PWM, WDT","Connectivity":"CANbus, 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 16x20b; D/A 4x8b","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":"$23.39","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$23.39000","currency":"USD"},{"qty":10,"price":"$21.57400","currency":"USD"},{"qty":25,"price":"$20.60400","currency":"USD"},{"qty":90,"price":"$18.42244","currency":"USD"},{"qty":270,"price":"$17.57400","currency":"USD"},{"qty":450,"price":"$16.72560","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/bce109168f5bfb1a2b6d3f9ab94fe849.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the closest functional second-source for CY8C3866AXI-040?","answer":"The CY8C4245LQI-483 is a PSoC 4 part with an ARM Cortex-M0 core at 48 MHz, 8x12-bit SAR ADC, and 34 I/O — it is not a pin-compatible drop-in. The CY8C3866AXI-040's 8051 core, 20-bit ADC array, and 62 I/O are distinct; a board spin is required to migrate to a PSoC 4 device."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/infineon/CY8C3866AXI-040","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/infineon/CY8C3866AXI-040 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-22T19:45:10.375Z","lastPublished":"2026-07-22T19:45:10.375Z","indexable":true}}