{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"CY8C4125AZI-S423","brand":"Infineon Technologies","brandSlug":"infineon","productSlug":"CY8C4125AZI-S423","canonicalUrl":"https://icboms.com/infineon/CY8C4125AZI-S423","factsUrl":"https://icboms.com/api/mcp/products/CY8C4125AZI-S423","rawCanonicalId":null},"summary":{"shortDescription":"Infineon PSoC® 4 CY8C4100S series, CY8C4125AZI-S423, 32-bit ARM Cortex-M0+ MCU, 24 MHz, 32 KB Flash, 4 KB RAM, 36 I/O, 48-LQFP/TQFP, -40°C to 85°C.","salesMarkdown":"## What this PSoC 4 MCU brings to a control or sensor interface design The Infineon CY8C4125AZI-S423 is a 32-bit ARM Cortex-M0+ MCU from the PSoC 4 CY8C4100S series, clocked at 24 MHz with 32 KB Flash and 4 KB RAM. It packs 36 I/O lines, CapSense touch-sensing hardware, LCD segment drive, and a full suite of serial interfaces — I2C, SPI, UART/USART, LINbus, IrDA, Microwire, and SmartCard — in a 48-pin TQFP package. The supply range spans 1.71 V to 5.5 V, letting it bridge 1.8 V and 5 V logic domains without a level shifter. Typical applications include industrial sensor nodes, human-machine interfaces (touch buttons/sliders), appliance control panels, and portable medical devices where the integrated analog and capacitive-sensing blocks reduce external component count. The ARM Cortex-M0+ core runs at 24 MHz, which is adequate for sensor polling, capacitive-touch scanning, and low-speed motor or valve control. It won't handle heavy DSP or high-speed data logging, but for a dedicated control or interface MCU the speed is well matched to the Flash and RAM sizes. ## Memory budget: 32 KB Flash, 4 KB RAM With 32 KB of Flash and 4 KB of RAM, this part targets firmware images under 20 KB and modest data buffers. The Flash is sufficient for a CapSense library, a communication stack (e.g., I2C slave or UART protocol), and application code — but leaves little room for over-the-air update staging or large lookup tables. The 4 KB RAM handles a few dozen sensor readings and a small frame buffer; designs needing larger packet buffers or extensive state machines should consider the higher-density siblings in the PSoC 4 family. The 1.71 V to 5.5 V supply range means it can run from a single Li-ion cell (through a regulator) or directly off a 5 V industrial rail. Brown-out detect, POR, and LVD are built in, so external supervisor ICs are unnecessary for basic power monitoring. ## Active lifecycle — no near-term obsolescence concern","metaTitle":"CY8C4125AZI-S423 PSoC 4 MCU, ARM Cortex-M0+, 24 MHz","metaDescription":"Infineon CY8C4125AZI-S423 32-bit ARM Cortex-M0+ MCU, 24 MHz, 32 KB Flash, 4 KB RAM, 36 I/O, CapSense, -40°C to 85°C.","metaKeywords":null},"attributes":{"series":"PSOC® 4 CY8C4100S","packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Microcontrollers & Processors (MCU / MPU / DSP)"],"specifications":{"Speed":"24MHz","Series":"PSOC® 4 CY8C4100S","Package":"Tray","RAM Size":"4K x 8","Core Size":"32-Bit Single-Core","Peripherals":"Brown-out Detect/Reset, CapSense, LCD, LVD, POR, PWM, WDT","Connectivity":"I2C, IrDA, LINbus, Microwire, SmartCard, SPI, SSP, UART/USART","Mounting Type":"Surface Mount","Number of I/O":"36","Core Processor":"ARM® Cortex®-M0+","Package / Case":"48-LQFP","Data Converters":"A/D 16x10b Slope, 16x12b SAR; D/A 2xIDAC","Oscillator Type":"Internal","lifecycle_stage":"eol_hot","Program Memory Size":"32KB (32K x 8)","Program Memory Type":"FLASH","Operating Temperature":"-40°C ~ 85°C (TA)","Supplier Device Package":"48-TQFP (7x7)","Voltage - Supply (Vcc/Vdd)":"1.71V ~ 5.5V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$3.27","priceTiers":[{"qty":1,"price":"$3.27000","currency":"USD"},{"qty":10,"price":"$2.93300","currency":"USD"},{"qty":25,"price":"$2.77240","currency":"USD"},{"qty":80,"price":"$2.40275","currency":"USD"},{"qty":250,"price":"$2.27956","currency":"USD"},{"qty":500,"price":"$2.04546","currency":"USD"},{"qty":1000,"price":"$1.72508","currency":"USD"},{"qty":2500,"price":"$1.63882","currency":"USD"},{"qty":5000,"price":"$1.57722","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/1ace7f65017fc7aa7d4f2258d7a89bb2.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/CY8C4125AZI-S423/alternatives.json"},"ai":{"faq":[{"question":"What are the equivalent or cross reference parts for CY8C4125AZI-S423?","answer":"The closest functional peer is the CY8C4245LQI-483, which runs at 48 MHz and has 34 I/O in a QFN package, but it shares the same Cortex-M0 core, CapSense, and serial interface set. For a drop-in replacement check the package variant CY8C4125PVI-S423 (same die in a different package). No exact second-source exists outside Infineon's PSoC 4 family."},{"question":"What is the programming interface for CY8C4125AZI-S423?","answer":"The part uses the standard PSoC 4 SWD (Serial Wire Debug) interface for programming and debugging. No external programmer is required beyond a common ARM SWD adapter like the MiniProg3 or J-Link. The internal oscillator means no external clock is needed for programming."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/infineon/CY8C4125AZI-S423","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/infineon/CY8C4125AZI-S423 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}}