{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"CY8C4124FNI-443T","brand":"Infineon Technologies","brandSlug":"infineon","productSlug":"CY8C4124FNI-443T","canonicalUrl":"https://icboms.com/infineon/CY8C4124FNI-443T","factsUrl":"https://icboms.com/api/mcp/products/CY8C4124FNI-443T","rawCanonicalId":null},"summary":{"shortDescription":"Infineon PSoC® 4 CY8C4100 series, CY8C4124FNI-443T, 32-bit ARM Cortex-M0+, 24 MHz, 16 KB Flash, 35-WLCSP, 31 I/O, -40°C to 85°C.","salesMarkdown":"## What this PSoC 4 MCU packs into a 35-WLCSP ## 24 MHz Cortex-M0+ — enough for touch and sensor fusion The 24 MHz core is modest by modern MCU standards, but for this part's intended role — scanning capacitive touch buttons/sliders, reading a handful of analog sensors, and managing serial communication — it's more than adequate. The 12-bit SAR ADC samples at rates suitable for slow-to-moderate signals (temperature, humidity, slider position), and the dual IDACs let you drive external sensor bias or generate analog waveforms without an external DAC. ## CapSense and the peripheral mix CapSense is the headline feature here — Cypress (now Infineon) built the PSoC 4 family around it. The CY8C4124FNI-443T includes hardware support for capacitive touch sensing, which means you can implement buttons, sliders, or proximity detection without a separate touch controller. The 31 I/O lines in this WLCSP give reasonable access for a part this small. No automotive qualification is listed, so it's not targeted for under-hood or chassis-domain applications. ## Package reality — WLCSP rework considerations The 35-WLCSP is a direct-solder-bump package with no leads — it's essentially the die with bumps. That means no visible pins to probe, and rework requires a hot-air station with a fine nozzle and a steady hand. The bumps are on a 0.4 mm or 0.5 mm pitch (typical for this class), so alignment under the microscope is critical. If you're hand-assembling prototypes, expect to use a solder paste stencil and a reflow oven; a soldering iron won't touch this. The upside: the package is thin and light, and the thermal mass is low, so reflow profiles are short. Just make sure the board's solder mask opening matches the bump pattern exactly — no room for guesswork.","metaTitle":"Infineon CY8C4124FNI-443T PSoC 4 MCU, ARM Cortex-M0+, 24 MHz","metaDescription":"CY8C4124FNI-443T: 32-bit ARM Cortex-M0+ MCU from Infineon PSoC 4 series, 24 MHz, 16 KB Flash, 31 I/O, CapSense, 8x12b ADC, 2xIDAC, -40°C to 85°C, 35-WLCSP.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Microcontrollers & Processors (MCU / MPU / DSP)"],"specifications":{"series":"PSOC® 4 CY8C4100","has_mpn":"CY8C4124","cpu_core":"ARM® Cortex®-M0+","frame_size":"32-Bit Single-Core","fuse_speed":"24 MHz","connectivity":"I²C, IrDA, LINbus, Microwire, SmartCard, SPI, SSP, UART/USART","package_type":"Tape & Reel (TR)","Number Of I/O":"31","mounting_type":"Surface Mount","product_status":"Active","Data Converters":"A/D 8x12b SAR; D/A 2xIDAC","Oscillator Type":"Internal","lifecycle_stage":"eol_hot","peripheral_types":"Brown-out Detect/Reset, CapSense, LCD, LVD, 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":"$1.66","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/1ace7f65017fc7aa7d4f2258d7a89bb2.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/CY8C4124FNI-443T/alternatives.json"},"ai":{"faq":[{"question":"What is the programming interface for CY8C4124FNI-443T?","answer":"The part uses the standard PSoC 4 programming interface — SWD (Serial Wire Debug) via the SWDIO and SWCLK pins. Infineon's PSoC Creator or ModusToolbox IDEs handle the flash programming through a MiniProg3 or KitProg adapter."},{"question":"Is CY8C4124FNI-443T compatible with 3.3V logic?","answer":"Yes. With a supply range starting at 1.71 V, the part operates comfortably at 3.3 V. All I/O pins are 3.3 V tolerant when the VDDIO rail is set accordingly. The internal ADC reference can be configured for 3.3 V operation as well."},{"question":"What is the replacement or equivalent for CY8C4124FNI-443T?","answer":"Within the same PSoC 4 family, the CY8C4245LQI-483 offers a similar peripheral set (CapSense, ADC, IDAC) but with a 48 MHz Cortex-M0 core, 34 I/O, and a QFN package — not a direct pin-compatible drop-in due to the different package and pin count. For a true WLCSP replacement, stick with the CY8C4124 series variants; the CY8C4124FNI-443T is the specific 16 KB Flash, 35-WLCSP option."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/infineon/CY8C4124FNI-443T","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/infineon/CY8C4124FNI-443T 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}}