{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"MC9S08RG32CFJ","brand":"NXP Semiconductors","brandSlug":"nxp","productSlug":"MC9S08RG32CFJ","canonicalUrl":"https://icboms.com/nxp/MC9S08RG32CFJ","factsUrl":"https://icboms.com/api/mcp/products/MC9S08RG32CFJ","rawCanonicalId":null},"summary":{"shortDescription":"NXP S08 series HCS08 8-bit microcontroller, MC9S08RG32CFJ, 8 MHz core, 32 KB Flash, 2 KB RAM, 25 I/O, SCI, SPI, 32-LQFP (7x7 mm), -40 to 85 °C.","salesMarkdown":"## Core specs and BOM-fit for a control MCU The MC9S08RG32CFJ is an NXP HCS08 8-bit microcontroller running at 8 MHz, with 32 KB of on-chip flash and 2 KB of RAM. That flash-to-RAM ratio (16:1) means the firmware image and lookup tables fit comfortably, but the data buffer space is tight — a control loop logging sensor values or holding a display frame needs to budget the 2 KB carefully. Its 25 general-purpose I/O pins in a 32-LQFP package give a solid pin-to-footprint ratio for simple control tasks like keypad scanning, LED driving, or relay toggling. On-chip peripherals include LVD (low-voltage detect) for brownout reset, POR for power-on reset, a PWM timer for dimming or motor speed control, and a watchdog timer for system supervision — all standard blocks that reduce external glue logic. ## Serial connectivity and temperature grade Serial communication is handled by one SCI (UART) module and one SPI module. The SCI supports asynchronous serial links to a host PC, Bluetooth module, or RS-485 transceiver; the SPI can talk to ADCs, DACs, or serial EEPROMs at bus speeds up to the core clock divided by 2. There is no I²C peripheral on this device — if your design needs I²C, you bit-bang it on two GPIOs or step up to the S08AC family. That covers unheated factory floors, outdoor enclosures in temperate climates, and engine bays with passive cooling. The 32-LQFP package measures 7x7 mm with a 0.8 mm pitch — fine enough for a two-layer board with careful fan-out, but the inner rows of the QFP may need a via to escape on a dense layout. ## Lifecycle and compliance reality One compliance caveat: the MC9S08RG32CFJ is listed as RoHS non-compliant. That likely means the plating or solder-ball alloy contains lead above the 0.1 % threshold. For markets with RoHS exemptions (military, aerospace, medical implant, some industrial controls) this is fine; for general EU consumer electronics it is a showstopper. Confirm the exemption status for your jurisdiction before committing the BOM line.","metaTitle":"MC9S08RG32CFJ 8-bit MCU, 8 MHz, 32 KB Flash, 32-LQFP","metaDescription":"NXP MC9S08RG32CFJ HCS08 8-bit MCU: 8 MHz core, 32 KB Flash, 2 KB RAM, 25 I/O, SCI/SPI, -40 to 85 °C, 32-LQFP. Active lifecycle, sourced to order.","metaKeywords":null},"attributes":{"series":"S08","packageCase":null,"mountingType":null,"rohsStatus":"RoHS non-compliant","productStatus":"Active","categoryPath":["Microcontrollers & Processors (MCU / MPU / DSP)"],"specifications":{"Speed":"8MHz","Series":"S08","Package":"Bulk","RAM Size":"2K x 8","Core Size":"8-Bit","Peripherals":"LVD, POR, PWM, WDT","Connectivity":"SCI, SPI","Mounting Type":"Surface Mount","Number of I/O":"25","Core Processor":"HCS08","Package / Case":"32-LQFP","Oscillator Type":"Internal","lifecycle_stage":"eol_hot","Program Memory Size":"32KB (32K x 8)","Program Memory Type":"FLASH","Operating Temperature":"-40°C ~ 85°C (TA)","Supplier Device Package":"32-LQFP (7x7)","Voltage - Supply (Vcc/Vdd)":"1.8V ~ 3.6V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$7.28","stockQuantity":0,"priceTiers":[{"qty":42,"price":"$7.28000","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/bc10b8f650c82191e14f00065d03c39a.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the closest functional second-source to MC9S08RG32CFJ?","answer":"The MC9S08RE8FJE is the nearest sibling in the S08 family — same core, same 8 MHz speed, same 25 I/O, same SCI/SPI connectivity, and same LVD/POR/PWM/WDT peripheral set. The key difference is memory: the RE8 carries 8 KB flash and 512 bytes RAM versus this part's 32 KB flash and 2 KB RAM. If your firmware fits in 8 KB, the RE8 is a pin-compatible drop-in for the same 32-LQFP footprint; if you need the full 32 KB, this part is the one."},{"question":"What does the 8 MHz core speed mean for a real control loop?","answer":"At 8 MHz the HCS08 executes most instructions in 2-4 clock cycles, so a tight PID loop or bit-banged protocol handler gets roughly 2-4 MIPS of throughput. That is enough for a 1 kHz sensor read-and-actuate cycle with margin, but not for high-speed PWM generation above about 50 kHz without timer hardware assist. The on-chip PWM timer handles the switching waveform directly, so the core just updates the duty-cycle register at the control-loop rate."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/nxp/MC9S08RG32CFJ","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/nxp/MC9S08RG32CFJ 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}}