{"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. ## 24 MHz Cortex-M0+ core — enough for real-time control loops 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. The internal oscillator eliminates the need for an external crystal in many designs, though the clock tree allows an external source if tighter timing is needed. ## 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. ## Industrial temperature grade and supply flexibility Rated for -40°C to 85°C ambient, the CY8C4125AZI-S423 fits factory-floor enclosures, outdoor telecom cabinets, and under-hood automotive cabin applications (though it lacks AEC-Q100 qualification). 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 There is no last-time-buy notice or NRND flag. For production planning, this means the part can be specified into a BOM without worrying about a sudden EOL — though always verify current lead times at quote time, as supply conditions shift.","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":["DC-DC Power Modules"],"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","stockQuantity":0,"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},"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":"2026-07-17T19:50:00.618Z","lastPublished":"2026-07-17T19:50:00.618Z","indexable":true}}