{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"MC9RS08KB4CTG","brand":"NXP Semiconductors","brandSlug":"nxp","productSlug":"MC9RS08KB4CTG","canonicalUrl":"https://icboms.com/nxp/MC9RS08KB4CTG","factsUrl":"https://icboms.com/api/mcp/products/MC9RS08KB4CTG","rawCanonicalId":null},"summary":{"shortDescription":"NXP RS08 series 8-bit MCU, MC9RS08KB4CTG, 20MHz core, 4KB (4K x 8) FLASH, 126 x 8 RAM, 1.8V-5.5V supply, -40°C to 85°C, 16-TSSOP package, 14 I/O, I²C/SPI, A/D 8x10b.","salesMarkdown":"## 20 MHz RS08 core in a 16-TSSOP — what this MCU brings to the BOM The NXP MC9RS08KB4CTG is an 8-bit microcontroller built around the RS08 core, clocked at 20 MHz. It carries 4 KB of on-chip Flash and 126 bytes of RAM — enough for a single control loop, a sensor readout, or a simple PWM sequence. The 14 general-purpose I/O lines and the 8-channel 10-bit ADC cover basic analog sensing without an external converter. Supply range spans 1.8 V to 5.5 V. The internal oscillator keeps the BOM count low — no external crystal or resonator needed unless the application demands tighter timing. On-chip peripherals include a low-voltage detect (LVD), power-on reset (POR), a PWM timer, and a watchdog timer (WDT). I²C and SPI are available for connecting to a temperature sensor, an EEPROM, or a small display. The part is rated for -40°C to 85°C, which covers outdoor telecom cabinets, factory-floor sensor nodes, and under-hood automotive modules that don't require AEC-Q100 certification. ## 4 KB Flash, 126 B RAM — sizing the memory budget The 4 KB program memory is a hard limit for firmware size. This part suits a state machine, a fan-speed controller, or a simple keypad scanner — not a protocol stack or a data logger. The 126 bytes of RAM handle a few variables and a small stack; anything larger needs external SRAM or a bigger MCU. ## Active lifecycle — no LTB clock ticking The MC9RS08KB4CTG carries an Active product status. For a BOM line that needs a stable, long-term supply, this MCU doesn't carry the obsolescence risk of an NRND or EOL part.","metaTitle":"NXP MC9RS08KB4CTG 8-bit MCU, 20 MHz, 4 KB Flash, 16-TSSOP","metaDescription":"NXP MC9RS08KB4CTG RS08 8-bit MCU: 20 MHz core, 4 KB Flash, 126 B RAM, 1.8-5.5 V, -40 to 85°C, 16-TSSOP.","metaKeywords":null},"attributes":{"series":"RS08","packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Discrete Semiconductors"],"specifications":{"Speed":"20MHz","Series":"RS08","Package":"Bulk","RAM Size":"126 x 8","Core Size":"8-Bit","Peripherals":"LVD, POR, PWM, WDT","Connectivity":"I²C, SPI","Mounting Type":"Surface Mount","Number of I/O":"14","Core Processor":"RS08","Package / Case":"16-TSSOP (0.173\\\", 4.40mm Width)","Data Converters":"A/D 8x10b","Oscillator Type":"Internal","lifecycle_stage":"eol_hot","Program Memory Size":"4KB (4K x 8)","Program Memory Type":"FLASH","Operating Temperature":"-40°C ~ 85°C (TA)","Supplier Device Package":"16-TSSOP","Voltage - Supply (Vcc/Vdd)":"1.8V ~ 5.5V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.33","stockQuantity":0,"priceTiers":[{"qty":226,"price":"$1.33000","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/b92cfa104f77e2bbb915f1256ea02bc7.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What are the alternatives or replacement for MC9RS08KB4CTG?","answer":"No official second-source or pin-compatible replacement is listed in the available records. For a drop-in alternate, check the RS08 family's higher-density variants (e.g., MC9RS08KA8) — they share the same core and package footprint but offer more Flash and RAM."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/nxp/MC9RS08KB4CTG","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/nxp/MC9RS08KB4CTG 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}}