{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"STM32F042K4U6","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"STM32F042K4U6","canonicalUrl":"https://icboms.com/stmicroelectronics/STM32F042K4U6","factsUrl":"https://icboms.com/api/mcp/products/STM32F042K4U6","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics STM32F042K4U6, STM32F0 series, 32-bit ARM Cortex-M0 MCU, 48 MHz, 16 KB Flash, 6 KB RAM, USB 2.0, CAN 2.0B, 26 GPIO, 12-bit ADC, -40 to 85°C, 32-UFQFPN.","salesMarkdown":"## What this Cortex-M0 MCU brings to a control board The STM32F042K4U6: The peripheral set includes USB, CAN, multiple UART/USART, SPI, I²C, and HDMI-CEC, plus a 13-channel 12-bit ADC. With 16 KB of Flash and 6 KB of RAM, this MCU targets applications where the firmware fits in a few thousand lines of C — a USB-to-UART bridge, a CANopen slave node, a simple PID controller, or a keypad scanner with I²C backlight control. The 6 KB RAM (organized as 6K x 8) leaves room for a modest stack and a couple of ping-pong buffers for USB or serial data. If the firmware needs to grow beyond 16 KB, the pin-compatible STM32F042K6 (32 KB Flash) or STM32F072 (128 KB Flash, Cortex-M0) are drop-in footprint matches — same 32-UFQFPN package, same supply range, same peripheral map. That gives a hardware revision path without a board spin. ## Connectivity and USB without an external PHY The integrated USB peripheral handles device and host modes with built-in transceivers — no external PHY needed. The CAN interface shares the same pin as one of the UARTs, so the design chooses either CAN or a full UART set depending on the fieldbus requirement. The 26 GPIO pins in the 32-UFQFPN package are enough for a 16×2 LCD character display plus a few buttons and LEDs, or for reading a 12-bit ADC channel while driving a PWM output for a small fan or heater. ## Package and PCB layout notes The 32-UFQFN with exposed pad (5×5 mm body) is a compact surface-mount package. No official second-source alternate exists from another manufacturer; the pin-compatible STM32F072 is ST's own density upgrade within the same package and footprint, useful for a last-minute firmware expansion without a PCB change.","metaTitle":"STM32F042K4U6 ARM Cortex-M0 MCU, 48 MHz, 16 KB Flash","metaDescription":"STMicroelectronics STM32F042K4U6 32-bit MCU, ARM Cortex-M0 at 48 MHz, 16 KB Flash, 6 KB RAM, USB/CAN, -40 to 85°C, 32-UFQFPN.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Microcontrollers & Processors (MCU / MPU / DSP)"],"specifications":{"Mfr":"STMicroelectronics","Speed":"48MHz","Series":"STM32F0","Package":"Tray","RAM Size":"6K x 8","Core Size":"32-Bit Single-Core","EEPROM Size":"-","Peripherals":"DMA, I²S, POR, PWM, WDT","Connectivity":"CANbus, HDMI-CEC, I²C, IrDA, LINbus, SPI, UART/USART, USB","Mounting Type":"Surface Mount","Number of I/O":"26","Core Processor":"ARM® Cortex®-M0","Package / Case":"32-UFQFN Exposed Pad","Product Status":"Active","Data Converters":"A/D 13x12b","Oscillator Type":"Internal","lifecycle_stage":"eol_hot","Base Product Number":"STM32F042","Program Memory Size":"16KB (16K x 8)","Program Memory Type":"FLASH","Operating Temperature":"-40°C ~ 85°C (TA)","Supplier Device Package":"32-UFQFPN (5x5)","Voltage - Supply (Vcc/Vdd)":"1.65V ~ 3.6V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$3.4500","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/2c1922c6f0807cc91ffca510b8e89a8e.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/STM32F042K4U6/alternatives.json"},"ai":{"faq":[{"question":"What is the difference between STM32F042 and STM32F072?","answer":"The STM32F072 is a higher-density sibling in the same STM32F0 family. Both share the same Cortex-M0 core and 32-UFQFPN package option, so the F072 is a drop-in upgrade for firmware that outgrows the F042's memory."},{"question":"Is STM32F042K4U6 compatible with STM32F042K6?","answer":"Yes, the STM32F042K4U6 and STM32F042K6 are pin-compatible in the same 32-UFQFPN package. The K6 variant doubles the Flash to 32 KB while keeping the same 6 KB RAM, peripheral set, and supply range. A board designed for the K4 can accept the K6 without any PCB change — useful for a firmware size upgrade."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/STM32F042K4U6","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/STM32F042K4U6 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-22T18:03:28.771Z","lastPublished":"2026-07-22T18:03:28.771Z","indexable":true}}