{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"CY8C3666AXI-037","brand":"Infineon Technologies","brandSlug":"infineon","productSlug":"CY8C3666AXI-037","canonicalUrl":"https://icboms.com/infineon/CY8C3666AXI-037","factsUrl":"https://icboms.com/api/mcp/products/CY8C3666AXI-037","rawCanonicalId":null},"summary":{"shortDescription":"Infineon Technologies PSoC® 3 CY8C36xx series 8-bit MCU, CY8C3666AXI-037, 8051 core at 67 MHz, 64 KB Flash, 8K x 8 RAM, 2K x 8 EEPROM, 62 I/O, 100-TQFP (14x14 mm), -40°C to 85°C.","salesMarkdown":"## 8051 core at 67 MHz with programmable analog The CY8C3666AXI-037 is an 8-bit MCU built around the 8051 core clocked at 67 MHz, part of the PSoC 3 family. The 67 MHz clock on an 8051 pipeline gives roughly 60 MIPS throughput — the limiting factor for loop-heavy control code is the flash wait-state profile, not the core itself. For mixed-signal tasks, the on-chip data converters include a 16-channel 12-bit ADC and a 4-channel 8-bit DAC, so many sensor-conditioning and analog-output loops close without an external converter. ## Peripheral set for human-interface and industrial comms On the connectivity side: CANbus, EBI/EMI, I²C, LINbus, SPI, and UART/USART — enough to talk to a fieldbus gateway, a local display, and a sensor array on the same chip. With 62 general-purpose I/O in the 100-TQFP package, the pinout can serve a parallel LCD data bus, a row-column keypad matrix, and several serial interfaces simultaneously without external GPIO expanders. The fine pitch demands a 4-layer PCB for reliable fan-out of the 62 I/O — two-layer boards will struggle to route the inner rows without vias under the package. Surface-mount assembly with a standard reflow profile; the package is ROHS3 compliant per the lifecycle record.","metaTitle":"Infineon CY8C3666AXI-037 PSoC 3 MCU, 67 MHz, 64 KB Flash","metaDescription":"Infineon CY8C3666AXI-037 PSoC 3 8-bit MCU, 8051 core at 67 MHz, 64 KB Flash, 8 KB RAM, 2 KB EEPROM, 62 I/O, 100-TQFP. Active production, ROHS3 compliant.","metaKeywords":null},"attributes":{"series":"PSOC® 3 CY8C36xx","packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Microcontrollers & Processors (MCU / MPU / DSP)"],"specifications":{"Speed":"67MHz","Series":"PSOC® 3 CY8C36xx","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","Mounting Type":"Surface Mount","Number of I/O":"62","Core Processor":"8051","Package / Case":"100-LQFP","Data Converters":"A/D 16x12b; 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":"$16.95","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$16.95000","currency":"USD"},{"qty":10,"price":"$15.57500","currency":"USD"},{"qty":25,"price":"$14.92920","currency":"USD"},{"qty":90,"price":"$13.15389","currency":"USD"},{"qty":270,"price":"$12.50833","currency":"USD"},{"qty":450,"price":"$11.70136","currency":"USD"}]},"links":{"datasheetUrl":null,"sourceUrl":null},"ai":{"faq":[{"question":"Where can I buy CY8C3666AXI-037 and check availability?","answer":"The CY8C3666AXI-037 is an active-production part. Availability is verified at quote time."},{"question":"What is the closest functional second-source to CY8C3666AXI-037?","answer":"The CY8C4245LQI-483 is a PSoC 4 device with a 32-bit ARM Cortex-M0 core at 48 MHz, 34 I/O, and a different peripheral set (8x12b ADC, 2xIDAC). It is not a pin-compatible or drop-in replacement — the core architecture, package (68-QFN vs 100-TQFP), and memory map differ. A board redesign and firmware port would be required."},{"question":"What compliance documentation does Infineon provide for CY8C3666AXI-037?","answer":"The part is ROHS3 Compliant per the lifecycle record. Infineon provides the standard RoHS and REACH declarations."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/infineon/CY8C3666AXI-037","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/infineon/CY8C3666AXI-037 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}}