{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"MC9RS08KB8CWJ","brand":"NXP Semiconductors","brandSlug":"nxp","productSlug":"MC9RS08KB8CWJ","canonicalUrl":"https://icboms.com/nxp/MC9RS08KB8CWJ","factsUrl":"https://icboms.com/api/mcp/products/MC9RS08KB8CWJ","rawCanonicalId":null},"summary":{"shortDescription":"NXP Semiconductors RS08 series 8-bit microcontroller, MC9RS08KB8CWJ, 20MHz core, 8KB Flash, 254 x 8 RAM, 20-SOIC package, -40°C to 85°C.","salesMarkdown":"## Core specs and memory budget The MC9RS08KB8CWJ runs an 8-bit RS08 core at 20 MHz — enough for simple control loops, sensor polling, and basic protocol handling. The 8 KB on-chip Flash (8K x 8) and 254 bytes of RAM set a tight memory envelope; firmware must fit within this footprint, leaving room for a small RTOS or a state-machine scheduler. The 12-channel 10-bit ADC covers basic analog inputs — temperature, current sense, or potentiometer feedback — without an external converter. I²C and SPI connectivity handle common peripheral devices like EEPROM, temperature sensors, or small displays. ## Supply and temperature range Industrial temperature grade (-40°C to 85°C) qualifies the part for factory-floor automation, outdoor telecom cabinets, and automotive cabin applications where the ambient stays below the 85°C ceiling. ## Package and board integration The 1.27 mm pin pitch is hand-solderable and reflow-compatible. No exposed pad — thermal dissipation relies on the leadframe and board copper. 18 I/O pins are available after accounting for the supply and oscillator pins. This is enough for a small keypad matrix, a few LED indicators, external interrupts, and the I²C/SPI bus. ## On-chip peripherals reduce external BOM Built-in LVD (low-voltage detect), POR (power-on reset), and WDT (watchdog timer) eliminate external reset supervisor ICs and watchdog timers. The internal oscillator means no external crystal or ceramic resonator is required for basic operation — the clock source is on-chip. A PWM module is available for dimming LEDs, driving small DC motors via an external FET, or generating analog voltages through an RC filter.","metaTitle":"NXP MC9RS08KB8CWJ RS08 MCU, 8KB Flash, 20MHz, 20-SOIC","metaDescription":"NXP MC9RS08KB8CWJ 8-bit MCU, RS08 core at 20MHz, 8KB Flash, 254B RAM, 1.8-5.5V, 20-SOIC. Active production. Quoted to order.","metaKeywords":null},"attributes":{"series":"RS08","packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Microcontrollers & Processors (MCU / MPU / DSP)"],"specifications":{"Speed":"20MHz","Series":"RS08","Package":"Bulk","RAM Size":"254 x 8","Core Size":"8-Bit","Peripherals":"LVD, POR, PWM, WDT","Connectivity":"I²C, SPI","Mounting Type":"Surface Mount","Number of I/O":"18","Core Processor":"RS08","Package / Case":"20-SOIC (0.295\\\", 7.50mm Width)","Data Converters":"A/D 12x10b","Oscillator Type":"Internal","lifecycle_stage":"eol_hot","Program Memory Size":"8KB (8K x 8)","Program Memory Type":"FLASH","Operating Temperature":"-40°C ~ 85°C (TA)","Supplier Device Package":"20-SOIC","Voltage - Supply (Vcc/Vdd)":"1.8V ~ 5.5V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.5","stockQuantity":0,"priceTiers":[{"qty":201,"price":"$1.50000","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/b92cfa104f77e2bbb915f1256ea02bc7.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the MC9RS08KB8CWJ's core speed and memory?","answer":"The RS08 core runs at 20 MHz. On-chip memory consists of 8 KB Flash (8K x 8) and 254 bytes of RAM. Firmware must fit within this footprint."},{"question":"What package does the MC9RS08KB8CWJ use?","answer":"The supplier device package is 20-SOIC."},{"question":"Does the MC9RS08KB8CWJ have an internal oscillator?","answer":"Yes, it has an internal oscillator — no external crystal or ceramic resonator is needed for basic clocking."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/nxp/MC9RS08KB8CWJ","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/nxp/MC9RS08KB8CWJ 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}}