{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"MC9S12XET256MAA","brand":"NXP Semiconductors","brandSlug":"nxp","productSlug":"MC9S12XET256MAA","canonicalUrl":"https://icboms.com/nxp/MC9S12XET256MAA","factsUrl":"https://icboms.com/api/mcp/products/MC9S12XET256MAA","rawCanonicalId":null},"summary":{"shortDescription":"NXP HCS12X 16-bit MCU, MC9S12XET256MAA, 50MHz core, 256KB Flash, 16K x 8 RAM, 4K x 8 EEPROM, 59 I/O, CANbus/SCI/SPI/I²C, -40°C to 125°C, 80-QFP.","salesMarkdown":"## What this 16-bit MCU brings to the BOM The NXP MC9S12XET256MAA is a 16-bit HCS12X microcontroller in an 80-QFP package, rated for 50 MHz operation. It carries 256 KB of Flash program memory, 16K x 8 RAM, and 4K x 8 EEPROM — enough code and data space for automotive body controllers, industrial CAN gateways, and motor-drive logic that must run without external memory. The -40°C to 125°C temperature range qualifies it for under-hood or factory-floor environments where commercial-grade parts drift or fail. Supply voltage spans 1.72 V to 5.5 V. ## Peripherals and connectivity — what is on-chip On-chip peripherals include LVD (low-voltage detect), POR (power-on reset), PWM, and WDT — the usual watchdog and supervision blocks for safety-critical designs. The connectivity set covers CANbus, EBI/EMI, I²C, IrDA, SCI, and SPI, so this MCU can talk to a CAN transceiver, an external memory chip, a serial LCD, or an IrDA transceiver without extra UARTs or bit-banging. A 12-channel, 12-bit ADC is integrated, which handles analog inputs like throttle position, temperature sensors, or current shunts without an external converter. ## I/O and package — board-fit details 59 general-purpose I/O lines are available on the 80-QFP (14x14 mm body). The QFP footprint is hand-solderable and rework-friendly, which matters for prototype runs and field repairs where a BGA would be impractical. An external oscillator is required; no internal RC clock is used for the core timing, so the board design must allocate space for a crystal or ceramic resonator. ## Lifecycle and sourcing posture The MC9S12XET256MAA is listed as Active with ROHS3 compliance.","metaTitle":"NXP MC9S12XET256MAA 16-bit MCU, 50MHz, 256KB Flash, 80-QFP","metaDescription":"NXP HCS12X 16-bit MCU with 50MHz core, 256KB Flash, 16K x 8 RAM, 4K x 8 EEPROM, CANbus, -40°C to 125°C.","metaKeywords":null},"attributes":{"series":"HCS12X","packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Analog & Data Acquisition"],"specifications":{"Speed":"50MHz","Series":"HCS12X","Package":"Tray","RAM Size":"16K x 8","Core Size":"16-Bit","EEPROM Size":"4K x 8","Peripherals":"LVD, POR, PWM, WDT","Connectivity":"CANbus, EBI/EMI, I²C, IrDA, SCI, SPI","Mounting Type":"Surface Mount","Number of I/O":"59","Core Processor":"HCS12X","Package / Case":"80-QFP","Data Converters":"A/D 12x12b","Oscillator Type":"External","lifecycle_stage":"eol_hot","Program Memory Size":"256KB (256K x 8)","Program Memory Type":"FLASH","Operating Temperature":"-40°C ~ 125°C (TA)","Supplier Device Package":"80-QFP (14x14)","Voltage - Supply (Vcc/Vdd)":"1.72V ~ 5.5V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$20.59","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$20.59000","currency":"USD"},{"qty":10,"price":"$16.45400","currency":"USD"},{"qty":80,"price":"$13.89638","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/4a05e186d3f7f737b3a259d85d857ce3.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the maximum operating frequency of the MC9S12XET256MAA?","answer":"The core runs at 50 MHz. This is the rated speed for the HCS12X core; bus timing and peripheral clock dividers are set via the clock-and-reset-generation module."},{"question":"What is a direct equivalent replacement for the MC9S12XET256MAA?","answer":"No pin-compatible direct replacement is listed in the official documentation. The MC9S12XEP100 is a higher-density sibling in the same HCS12X family, but its memory and peripheral complement differ — verify compatibility against your firmware and pin requirements before substituting."},{"question":"Where can I find the MC9S12XET256MAA datasheet?","answer":"The datasheet is published by NXP under the HCS12X series documentation. It covers the full register map, electrical characteristics, and application notes for this MCU."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/nxp/MC9S12XET256MAA","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/nxp/MC9S12XET256MAA 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}}