{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"CY9AF421LWQN-G-JNE2","brand":"Infineon Technologies","brandSlug":"infineon","productSlug":"CY9AF421LWQN-G-JNE2","canonicalUrl":"https://icboms.com/infineon/CY9AF421LWQN-G-JNE2","factsUrl":"https://icboms.com/api/mcp/products/CY9AF421LWQN-G-JNE2","rawCanonicalId":null},"summary":{"shortDescription":"Infineon Technologies FM3 MB9A420L series 32-bit ARM Cortex-M3 microcontroller, CY9AF421LWQN-G-JNE2, 40MHz, 64KB flash, 8K x 8 RAM, 51 I/O, CANbus, I²C, LINbus, UART/USART, 64-WFQFN exposed pad.","salesMarkdown":"## Cortex-M3 core at 40 MHz — flash and RAM budget The CY9AF421LWQN-G-JNE2: The ARM Cortex-M3 core runs at 40 MHz, delivering a deterministic interrupt latency that suits real-time control loops. The 64 KB of on-chip flash (64K x 8) and 8K x 8 SRAM set the firmware footprint ceiling — a full CANopen stack plus a modest application layer fits, but leave headroom for the bootloader and any field-update staging buffer. The internal oscillator means no external crystal is required for the core clock, saving two pins and a PCB component. The LVD, POR, and WDT peripherals handle brown-out and watchdog supervision without an external supervisor IC. ROHS3 compliance is confirmed on the lifecycle record, so the part passes EU material restrictions without additional documentation. ## Connectivity and analog I/O The CANbus interface, along with I²C, LINbus, CSIO, and UART/USART, makes this MCU a natural fit for industrial fieldbus nodes and sensor hubs. The 8-channel 12-bit ADC and single 10-bit DAC handle analog sensor conditioning and simple analog output without an external converter. 51 general-purpose I/O pins are available in the 64-QFN package (9x9 mm, exposed pad).","metaTitle":"Infineon CY9AF421LWQN-G-JNE2 MCU, Cortex-M3, 40MHz","metaDescription":"Infineon CY9AF421LWQN-G-JNE2 32-bit ARM Cortex-M3 MCU, 40MHz, 64KB flash, 8Kx8 RAM, CANbus, -40 to 105°C, 64-QFN. Active production, ROHS3. Request a quote.","metaKeywords":null},"attributes":{"series":"FM3 MB9A420L","packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Microcontrollers & Processors (MCU / MPU / DSP)"],"specifications":{"Speed":"40MHz","Series":"FM3 MB9A420L","Package":"Tray","RAM Size":"8K x 8","Core Size":"32-Bit Single-Core","Peripherals":"LVD, POR, WDT","Connectivity":"CANbus, CSIO, I²C, LINbus, UART/USART","Mounting Type":"Surface Mount","Number of I/O":"51","Core Processor":"ARM® Cortex®-M3","Package / Case":"64-WFQFN Exposed Pad","Data Converters":"A/D 8x12b; D/A 1x10b","Oscillator Type":"Internal","lifecycle_stage":"eol_hot","Program Memory Size":"64KB (64K x 8)","Program Memory Type":"FLASH","Operating Temperature":"-40°C ~ 105°C (TA)","Supplier Device Package":"64-QFN (9x9)","Voltage - Supply (Vcc/Vdd)":"2.7V ~ 5.5V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$10.95","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$10.95000","currency":"USD"},{"qty":10,"price":"$9.89000","currency":"USD"},{"qty":25,"price":"$9.43000","currency":"USD"},{"qty":80,"price":"$8.18800","currency":"USD"},{"qty":230,"price":"$7.82000","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/039dbe881f9fd6ec486a442ef7135c81.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Is CY9AF421LWQN-G-JNE2 a drop-in replacement for XMC4100F64K128BAXQMA1?","answer":"No — the XMC4100 is a Cortex-M4 at 80 MHz with a different peripheral set and package options. The CY9AF421LWQN-G-JNE2 is a Cortex-M3 at 40 MHz in a 64-QFN package; the two are not pin-compatible without a board spin."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/infineon/CY9AF421LWQN-G-JNE2","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/infineon/CY9AF421LWQN-G-JNE2 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}}