{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"CY8C3666LTI-027","brand":"Infineon Technologies","brandSlug":"infineon","productSlug":"CY8C3666LTI-027","canonicalUrl":"https://icboms.com/infineon/CY8C3666LTI-027","factsUrl":"https://icboms.com/api/mcp/products/CY8C3666LTI-027","rawCanonicalId":null},"summary":{"shortDescription":"Infineon/Cypress PSoC 3 CY8C36xx, CY8C3666, 8-Bit 8051, 67 MHz, 64KB FLASH, 38 I/O, 68-QFN, -40°C to 85°C.","salesMarkdown":"## 67 MHz 8051 core with programmable analog and digital blocks The Infineon CY8C3666LTI-027 is an 8-bit 8051-based PSoC 3 microcontroller from the CY8C36xx family, clocked at 67 MHz. The part includes an internal oscillator, so no external crystal is required for basic operation. A standout feature is the on-chip data converter array: a 16-channel, 12-bit ADC and a 4-channel, 8-bit DAC. This allows the MCU to handle mixed-signal tasks — sensor conditioning, analog feedback loops, or simple audio output — without a separate analog front-end IC.","metaTitle":"CY8C3666LTI-027 PSoC 3 8-Bit MCU, 67 MHz, 64KB Flash, 68-QFN","metaDescription":"Infineon/Cypress CY8C3666LTI-027 PSoC 3 8-bit 8051 MCU at 67 MHz with 64KB Flash, 38 I/O, USB, CapSense, 16x12b ADC, 4x8b DAC.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Microcontrollers & Processors (MCU / MPU / DSP)"],"specifications":{"series":"PSOC® 3 CY8C36xx","has_mpn":"CY8C3666","cpu_core":"8051","frame_size":"8-Bit","fuse_speed":"67 MHz","connectivity":"EBI/EMI, I²C, LINbus, SPI, UART/USART, USB","package_type":"Bulk","Number Of I/O":"38","mounting_type":"Surface Mount","product_status":"Active","Data Converters":"A/D 16x12b; D/A 4x8b","Oscillator Type":"Internal","lifecycle_stage":"eol_hot","peripheral_types":"CapSense, DMA, LCD, POR, PWM, WDT","supply_voltage_v":"1.71","Program Memory Type":"FLASH","Operating Temperature High":"-40°C to 85°C (TA)"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$14.30","priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/CY8C3666LTI-027/alternatives.json"},"ai":{"faq":[{"question":"Is CY8C3666LTI-027 obsolete or active?","answer":"The CY8C3666LTI-027 is listed as Active."},{"question":"Can CY8C3666LTI-027 replace CY8C3666LTI-026?","answer":"The CY8C3666LTI-027 and CY8C3666LTI-026 share the same base die (CY8C3666) and 68-QFN package. The suffix difference typically reflects a firmware revision or pre-programmed configuration. Electrically and pin-compatible, but verify the specific factory-programmed content if the application relies on it."},{"question":"What is the difference between CY8C3666LTI-027 and CY8C3666AXI-027?","answer":"The 'LTI' suffix denotes a 68-pin QFN package, while 'AXI' indicates a 100-pin TQFP package. The AXI variant offers more I/O pins (up to 70 vs. 38) and a larger footprint. All other core specs — 67 MHz 8051, 64 KB Flash, analog peripherals — are identical between the two order codes."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/infineon/CY8C3666LTI-027","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/infineon/CY8C3666LTI-027 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:49:49.435Z","lastPublished":"2026-08-11T15:49:49.435Z","indexable":true}}