MC9S12XDT256MAA - 16-bit 80MHz 256KB Flash MCU | NXP
MPN: MC9S12XDT256MAA ✗ End of Life| Qty | Unit Price | Extended |
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| 1 | $0 | $0.00 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
MC9S12XDT256MAA Overview
A 16-bit microcontroller (MCU) is a single-chip computing device whose arithmetic logic unit and internal data paths are 16 bits wide. The MC9S12XD family sits within the broader HCS12X / S12XD hierarchy of automotive-oriented microcontrollers, which themselves belong to the microcontroller unit (MCU) class of embedded processors. MCUs integrate CPU, memory, and peripherals on one die, making them the control backbone of body electronics, gateways, and industrial nodes.
Key features include the 16-bit HCS12X CISC core, upward compatible with the HCS12 instruction set, delivering 32-bit-class performance with 16-bit efficiency. Peripherals include CANbus, EBI/EMI external bus interface, I2C, IrDA, LINbus, SCI, and SPI connectivity, plus PWM, watchdog timer (WDT), low-voltage detect (LVD), and power-on reset (POR). The enhanced indexed addressing and instruction queue improve code density and interrupt latency versus legacy HCS12 devices.
Architecturally, the S12XD family was targeted at automotive multiplexing applications, where its XGATE-style co-processor concept and rich CAN/LIN mix offload communication processing from the main core. The 256KB Flash supports single-chip designs without external memory, and the 5V-tolerant I/O structure suits harsh 12V automotive electrical environments.
Typical applications include automotive body control modules, gateway nodes bridging CAN and LIN networks, dashboard and instrumentation clusters, and industrial control systems that benefit from 5V noise immunity.
A key design consideration is lifecycle status: NXP lists this part as NRND (Not Recommended for New Designs), so new projects should evaluate S12XE/XS family successors while the XDT256 remains ideal for maintaining existing designs.
This page synthesizes distributor inventory data, drop-in alternatives, lifecycle status, and practical design notes not found in the manufacturer datasheet, delivering information gain beyond standard catalog listings.
Drop-in alternatives for MC9S12XDT256MAA — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with MC9S12XDT256MAA (same form factor and footprint) — differing in Package, Operating Temperature, Core Processor, RAM Size, Supply Voltage.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MC9S12XDT512MAA
✅ Drop-In✓ In Stock
Contact for price
View Datasheet →MC9S12XDT256CAG
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$17.4 / Unit
View Datasheet →MC9S12XDT256MAL
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$15.85 / Unit
View Datasheet →MC9S12XET256MAA
✅ Drop-In✓ In Stock
$6.98 / Unit
View Datasheet →MC9S12XD256MAA
✅ Drop-In✓ In Stock
$11.95 / Unit
View Datasheet →S912XET256J2VAG
✅ Drop-In✓ In Stock
Contact for price
View Datasheet →MC9S12XEQ384CAG
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View Datasheet →MC9S12XDT256MAA Maximum Ratings & Electrical Characteristics
| Core Processor | HCS12X |
| Core Size | 16-Bit |
| Core Architecture | CISC |
| Maximum Clock Speed | 80 MHz |
| Program Memory Size | 256KB (256K x 8) |
| Program Memory Type | FLASH |
| RAM Size | 16KB |
| Supply Voltage | 2.5V/5V |
| Connectivity | CANbus, EBI/EMI, I2C, IrDA, LINbus, SCI, SPI |
| Peripherals | LVD, POR, PWM, WDT |
| Number of I/O | 59 |
| Package | 80-QFP (14x14 mm) |
| Mounting Type | Surface Mount |
| Terminal Form | Gull Wing |
| Packaging | Tray |
| Temperature Grade | Automotive |
| Part Status | NRND (Not Recommended for New Designs) |
MC9S12XDT256MAA 80-qfp (14x14 mm) Pin Configuration Guide
Pin configuration for MC9S12XDT256MAA (80-qfp (14x14 mm) package). This digital IC includes GPIO, communication interfaces (UART, SPI, I2C), and power pins. Refer to the manufacturer datasheet for alternate pin functions and configuration options. Essential for embedded system design and PCB layout.
No detailed pinout data available for MC9S12XDT256MAA.
Refer to the datasheet for full pin configuration.
Typical Applications
MC9S12XDT256MAA is suitable for 6 applications: Automotive Body Control Modules, CAN/LIN Network Gateways, Automotive Dashboard and Instrument Clusters, Industrial Control and Automation Nodes, Motor Control and Actuator Drivers, Diagnostic and Telematics Interface Modules.
Automotive Body Control Modules
Body control modules (BCMs) coordinate lighting, window lift, door locks, and wiper functions across a vehicle's electrical system. The MC9S12XDT256MAA fits this role directly: its automotive temperature grade, 5V-tolerant I/O with 59 lines, PWM channels for lamp dimming and motor control, and watchdog timer with low-voltage detect address the reliability requirements of 12V in-vehicle environments. The 256KB Flash accommodates full body-function firmware in a single chip without external memory, while the 80 MHz HCS12X core delivers 32-bit-class throughput at 16-bit code efficiency. Because the S12XD family was designed specifically for automotive multiplexing, reference designs and toolchain support are mature, reducing development risk in legacy platform maintenance.
Recommended
CAN/LIN Network Gateways
In-vehicle gateways bridge high-speed CAN trunk networks to lower-cost LIN sub-networks for sensors and actuators. The MC9S12XDT256MAA integrates both CANbus and LINbus controllers on-chip, alongside SCI and SPI for diagnostic links, allowing a single MCU to perform protocol translation without external communication ICs. The enhanced indexed addressing and instruction queue of the HCS12X core reduce interrupt latency when handling bursty CAN traffic, and the 16KB RAM buffers message queues for gateway routing tables. In existing platform designs, the 80-QFP (14x14 mm) footprint and 5V I/O directly reuse qualified schematics. For new gateway designs, engineers should evaluate the active-lifecycle S12XE successors, but for sustaining approved XDT256 platforms this part remains the path of least requalification.
Recommended
Automotive Dashboard and Instrument Clusters
Instrument clusters combine stepper-motor gauge drive, backlight dimming, switch scanning, and CAN communication to the vehicle network. The MC9S12XDT256MAA's PWM peripherals drive gauge and backlight dimming with hardware timing independent of software load, while its 59 I/O lines scan keypads and indicator lamps directly. The 80 MHz core headroom handles multiplexed display refresh and CAN message filtering simultaneously, and 256KB Flash stores display tables and calibration data on-chip. Its 5V I/O structure interfaces cleanly with legacy 5V cluster components without level shifters. Automotive temperature grading ensures operation across the full vehicle cabin environment. Existing cluster platforms validated on the S12XD generation can sustain production with this NRND part while planning migration to S12XE-class successors.
Recommended
Industrial Control and Automation Nodes
Industrial nodes require robust 5V logic, deterministic interrupt behavior, and serial connectivity to PLC backbones. The MC9S12XDT256MAA serves these needs with an SPI and SCI interface for fieldbus and HMI links, EBI/EMI external bus for memory-mapped expansion, and PWM outputs for actuator and motor drive. The 16-bit HCS12X CISC core provides predictable execution timing valued in sequential control logic, and the watchdog timer plus power-on reset and low-voltage detect deliver fail-safe behavior required in factory equipment. Its 5V tolerance simplifies interfacing with industrial sensors still specified at 5V levels, and the 80-QFP 14x14 mm package fits standard reflow assembly. For new industrial designs, note the NRND status and consider S12XE-family pin-compatible parts instead.
Recommended
Motor Control and Actuator Drivers
DC motor and actuator control in mechatronic modules (throttle, HVAC flaps, seat adjusters) benefits from the MC9S12XDT256MAA's hardware PWM channels, which generate fixed-frequency drive signals independent of CPU load. The 80 MHz core executes closed-loop control algorithms using feedback from timer-input-capture signals, and the 59 I/O lines interface H-bridge drivers and limit switches directly at 5V logic. The watchdog timer ensures PWM outputs enter a safe state on software failure, a requirement for in-cabin actuator safety. Automotive temperature grading and the S12XD family's automotive pedigree align with module-level qualification requirements. Designs already qualified on this die can sustain supply via remaining stock; new actuator designs should adopt active S12XE equivalents in the same 80-QFP footprint.
Recommended
Diagnostic and Telematics Interface Modules
Service diagnostic modules and early telematics units tap vehicle CAN buses and forward data over SCI/IrDA or external links. The MC9S12XDT256MAA's CAN controller, SCI UART, and IrDA support cover both in-vehicle capture and workshop-tool connectivity, while 16KB RAM buffers logged frames between upload sessions. The EBI/EMI external bus allows attachment of additional nonvolatile memory for extended log storage beyond the on-chip 256KB Flash, a flexibility not always present in modern single-chip MCUs. Its 5V I/O tolerates the electrical abuse of workshop environments, and the automotive grade covers under-hood adjacent placements. For legacy diagnostic hardware sustaining a vehicle fleet, this NRND part remains procurable via XAIPART sourcing with pin-compatible S12XE successors as forward migration.
Recommended
Recommended Products Summary
Engineering reference data for MC9S12XDT256MAA — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MC9S12XDT512MAA | MC9S12XDT256CAG | MC9S12XET256MAA | MC9S12XEQ384CAG |
|---|---|---|---|---|---|
| Package | 80-QFP (14x14 mm) | 80-QFP (14x14 mm) - same | 80-QFP - same | 80-QFP (14x14 mm) - same | 80-QFP - same |
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Core / Architecture | HCS12X 16-bit CISC | HCS12X 16-bit CISC | HCS12X 16-bit CISC | S12XE 16-bit (next generation) | HCS12X 16-bit CISC |
| Max Clock Speed | 80 MHz | 80 MHz | 80 MHz | 80 MHz | 80 MHz |
| Program Flash | 256KB | 512KB | 256KB | 256KB | 384KB |
| Connectivity | CAN, LIN, I2C, IrDA, SCI, SPI, EBI/EMI | CAN, LIN, I2C, SCI, SPI, EBI/EMI | CAN, LIN, SCI, SPI | CAN, LIN, SCI, SPI | CAN, LIN, SCI, SPI |
Key Differentiators
- Largest on-chip Flash in XD-class 80-QFP option set (vs MC9S12XDT256CAG)
- Rich connectivity set including IrDA and EBI/EMI (vs MC9S12XET256MAA)
- Legacy code compatibility advantage (vs S912XET256J2VAG)
Design Notes
The MC9S12XDT256MAA is NRND per NXP's product page. Before committing a new PCB, confirm lifetime supply: either place a last-time-buy covering the product's service life or design in a pin-compatible S12XE successor such as S912XET256J2VAG from the start. NRND parts can transition to obsolete with limited notice, and spot-market stock carries counterfeit risk - source only through authorized or verified distributors.
The device operates from a 5V supply with a 2.5V core-referenced domain per specification listings. Decouple VDD/VDDPLL pins with 0.1uF ceramics placed within 5 mm of each pin, and add 10uF bulk capacitance per power domain. Observe the S12XD datasheet's specified PLL filter network on XFC pins to guarantee stable 80 MHz bus-clock operation; an incorrect loop filter causes jitter and CAN bit-timing errors.
The 80-QFP (14x14 mm) gull-wing package needs a standard 0.5 mm-pitch QFP land pattern per the manufacturer's mechanical drawing. Use thermal relief-free direct connections on VSS pins and a solid ground plane on layer 2 for CAN/LIN signal integrity. Keep CAN transceiver traces short and pair differential routing; route the 80 MHz bus clock away from analog I/O and CAN lines to minimize EMI in automotive harness environments.
Compliance Information
Temperature grade is listed as AUTOMOTIVE by distributor data (Partstack). RoHS/REACH/lead-free status were not stated in the captured web data; verify on NXP's product page environmental section.