S912XET256J2CAG - 50MHz 256KB 16-Bit Automotive MCU | NXP
MPN: S912XET256J2CAG ✓ Active| 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 |
S912XET256J2CAG Overview
A microcontroller is a programmable semiconductor that integrates a CPU core, memory, timers, communication interfaces, analog conversion functions, and control logic on one integrated circuit. The S912X device family belongs to the HCS12X 16-bit MCU hierarchy, combining a 16-bit S12X CPU with an XGATE co-processor. This architecture is intended for real-time embedded applications where predictable execution, peripheral integration, and low-cost control are more important than the software ecosystem associated with higher-bit application processors.
Key verified features include a 50 MHz S12X CPU, 256 KB of programmable flash, XGATE co-processor support, programmable hardware-emulated EEPROM, a memory protection unit, supervisor and user operating modes, a 12-bit ADC with a 3 µs conversion time, an enhanced capture timer, a periodic interrupt timer, and a real-time interrupt timer. These resources allow one device to combine motor or actuator control, diagnostics, communications, and safety-oriented supervisory functions.
The S12X core operates at 50 MHz, while the XGATE processor can assist with virtual peripheral functions and overall processing throughput. Hardware-emulated EEPROM supports parameter storage without requiring a separate external memory device. The memory protection unit and supervisor/user modes improve system integrity by separating privileged functions from application-level code. The 12-bit ADC is suited to analog monitoring where resolution and a stated 3 µs conversion time are important.
Typical applications include automotive body-control modules, actuator and motor controllers, sensor-interface systems, electronic control units, instrumentation, industrial automation equipment, and embedded diagnostic controllers. The -40°C to +85°C temperature range supports applications beyond ordinary room-temperature consumer products, while the automotive qualification designation is relevant to electronic modules requiring supplier-controlled quality and reliability.
Designers should preserve the 144-LQFP footprint and verify the complete pinout, power rails, clock configuration, reset requirements, and peripheral multiplexing before substitution. The 20 mm by 20 mm package is relatively large for a microcontroller, but it exposes the high pin count needed for automotive control, analog, communication, and debug functions. The verified data does not provide a complete electrical table or full pin-level mapping, so those details must be taken from the manufacturer datasheet.
This page combines verified manufacturer and distributor information with practical application guidance, package context, procurement data, and explicit design caveats. It is intended to help engineers identify the correct MCU, plan a PCB footprint, and decide whether the automotive-qualified S12X architecture is appropriate before completing detailed firmware and hardware validation.
Drop-in alternatives for S912XET256J2CAG — 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 S912XET256J2CAG (same form factor and footprint) — differing in Mounting Type, Package, Core Architecture, Debug Interface, Operating Temperature.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
S912XET256J2CAA
✅ Drop-In📋 Reference alternative (not in catalog)
S912XET256J2CAGR
✅ Drop-In📋 Reference alternative (not in catalog)
S912XDT256F1VAA
✅ Drop-In✓ In Stock
$13.6 / Unit
View Datasheet →S912XES384J3VAL
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$14.85 / Unit
View Datasheet →S912XES384J2CAL
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$5.15 / Unit
View Datasheet →S912XET256J2CAG Maximum Ratings & Electrical Characteristics
| CPU Type | S12X 16-bit core |
| Maximum CPU Frequency | 50 MHz |
| Flash Memory | 256 KB |
| Microcontroller Class | 16-bit MCU |
| Architecture | HCS12X with XGATE co-processor |
| Package | 144-LQFP, 20 mm x 20 mm |
| Operating Temperature | -40°C to +85°C |
| Automotive Qualification | Automotive qualified |
| ADC Resolution | 12-bit |
| ADC Conversion Time | 3 µs |
| Memory Protection | Memory protection unit |
| Software Protection Modes | Supervisor/user modes |
| Programmable Storage | Programmable hardware-emulated EEPROM |
| Timer Peripherals | Enhanced capture timer, periodic interrupt timer, real-time interrupt timer |
| Co-Processor | XGATE co-processor |
| Mounting Type | Surface-mount gull-wing LQFP |
| Lifecycle Status | Active |
S912XET256J2CAG 144-lqfp, 20 mm x 20 mm Pin Configuration Guide
Pin configuration for S912XET256J2CAG (144-lqfp, 20 mm x 20 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 S912XET256J2CAG.
Refer to the datasheet for full pin configuration.
Typical Applications
S912XET256J2CAG is suitable for 6 applications: Automotive Body-Control Module, Automotive Actuator and Motor Controller, Automotive Sensor Interface ECU, Vehicle Diagnostic and Communication Gateway, Industrial Automation Controller, Programmable Test and Measurement Equipment.
Automotive Body-Control Module
The S912XET256J2CAG fits a body-control module that coordinates lighting, locks, windows, sensors, and other vehicle functions. Its 50 MHz S12X CPU provides deterministic execution for multiple control tasks, while the verified XGATE co-processor can off suitable background or peripheral-processing work. The 12-bit ADC with a stated 3 µs conversion time is useful for monitoring resistive or analog sensor inputs. The -40°C to +85°C range and automotive-qualified listing are appropriate for a temperature-varying vehicle environment. The engineer should still validate exact communication peripherals, pin multiplexing, load-switch drive capability, and diagnostic requirements in the datasheet before releasing a production ECU.
Recommended
Automotive Actuator and Motor Controller
The S912XET256J2CAG is suited to actuator or motor-control modules where a microcontroller must coordinate timing, sensor conversion, protection logic, and external power drivers. Its timer peripherals support periodic and real-time event handling, while the 12-bit ADC can monitor feedback signals such as position, current, temperature, or supply voltage. The 256 KB flash capacity provides room for control algorithms, diagnostics, and calibration data. In practice, the MCU is only one part of the system: external MOSFETs or motor drivers, current sensing, overcurrent protection, thermal design, and electromagnetic-compatibility filtering must also be validated.
Recommended
Automotive Sensor Interface ECU
The S912XET256J2CAG can serve as the central controller for an automotive sensor interface when analog monitoring and deterministic control are required. The verified 12-bit ADC and 3 µs conversion specification provide a defined starting point for sampling system design, while the enhanced capture timer, periodic interrupt timer, and real-time interrupt timer help structure control and diagnostic events. XGATE support may be useful for virtual peripherals or parallel background processing. A practical implementation must include input protection, sensor excitation where required, reference-voltage accuracy, calibration storage, and fault detection; those analog specifications are not supplied in the verified data and must be obtained from the official datasheet.
Recommended
Vehicle Diagnostic and Communication Gateway
The S912XET256J2CAG can support a vehicle diagnostic or communication subsystem when the design needs a 16-bit real-time CPU, substantial program storage, and embedded control peripherals. The 256 KB flash supports firmware for protocol handling, diagnostics, logging, and configuration, while the XGATE co-processor can help distribute suitable workloads. The exact CAN, LIN, or other vehicle-network interfaces are not specified in the supplied data, so interface suitability cannot be inferred from the MPN alone. Before selecting the MCU, verify the required network controllers, transceiver interface, diagnostic identifiers, bootloader behavior, and electrical characteristics in the official manufacturer documentation.
Recommended
Industrial Automation Controller
The S912XET256J2CAG is also relevant to industrial automation equipment requiring a deterministic 16-bit MCU and extended temperature operation. It can coordinate sensor sampling, timing functions, actuator commands, and local diagnostics in machinery or process-control equipment. Its 50 MHz S12X core and 256 KB flash provide a practical embedded platform, while the automotive qualification listing may help organizations standardize on a robust MCU family. The package is a 144-LQFP rather than a compact leadless package, so board designers should confirm available PCB area, routing density, thermal performance, and production assembly capability before choosing it over a smaller industrial MCU.
Recommended
Programmable Test and Measurement Equipment
The S912XET256J2CAG can serve in programmable test equipment where sequencing, ADC measurement, timing, and local control must be coordinated in one embedded platform. Its 50 MHz S12X CPU supports event-driven control, and the timer peripherals can organize pulse generation, sampling, or calibration tasks. The 12-bit ADC is relevant for instrumentation inputs, although the supplied data does not define input voltage, sample-rate, accuracy, or reference specifications. A successful design therefore requires careful analog front-end design, calibration, input protection, and noise control. The large 144-LQFP footprint provides ample pins for external interfaces but requires careful PCB layout and assembly planning.
Recommended
Recommended Products Summary
Engineering reference data for S912XET256J2CAG — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | S912XET256J2CAA | S912XET256J2CAGR | S912XDT256F1VAA | S912XES384J3VAL | S912XES384J2CAL |
|---|---|---|---|---|---|---|
| Package | 144-LQFP (20x20) | 144-LQFP (20x20) - same package family | 144-LQFP (20x20) - same package family | 144-LQFP - package family requires confirmation | 144-LQFP - package family requires confirmation | 144-LQFP - package family requires confirmation |
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| CPU Architecture | 16-bit S12X / HCS12X | S912X family; detailed verification required | S912X family; detailed verification required | S12X family; detailed verification required | S12X family; detailed verification required | S12X family; detailed verification required |
| Verified Price | Not numerically provided | Not numerically provided | Not numerically provided | Not numerically provided | Not numerically provided | Not numerically provided |
Key Differentiators
- Automotive-oriented S912X positioning (vs S912XDT256F1VAA)
- 50 MHz S12X processing with XGATE support (vs S912XES384J3VAL)
- 256 KB verified flash capacity (vs S912XES384J2CAL)
Design Notes
Start the layout by using the official 144-LQFP package drawing and pin table rather than a generic 144-pin QFP footprint. Confirm pad length, lead pitch, exposed or non-exposed thermal-pad details, pin-1 orientation, and solder-mask clearance. The verified data identifies a 20 mm by 20 mm package, but does not provide the complete land pattern or pin assignments, so production artwork must be cross-checked against the current NXP datasheet.
Design the supply rails and decoupling around the MCU's verified operating limits once those limits are obtained from the manufacturer datasheet. Place bulk and high-frequency bypass capacitors close to the corresponding power pins, keep return paths short, and provide clean grounding for the ADC and timing circuits. The verified data identifies a 12-bit ADC but does not specify supply voltage, ADC reference, input range, or current consumption, so those values must not be guessed.
Do not treat a similar S912X-family MPN as interchangeable based only on the package name or the 256/384 KB-style part-number field. A true drop-in replacement requires exact pin assignment, memory-map, peripheral, electrical, clock, reset, and firmware compatibility. Verify the ordering code, temperature grade, qualification, errata, and lifecycle status with NXP before releasing a replacement to production.
Route sensitive ADC inputs away from switching power nodes, high-current motor-drive traces, and other likely noise sources. Use a compact analog ground strategy appropriate to the complete system and keep the reference and measurement paths short. Because the available data does not provide ADC full-scale range, input impedance, acquisition time, or reference voltage, the final analog layout must be based on the official electrical characteristics rather than assumptions.
Estimate junction temperature from the actual MCU dissipation, package thermal resistance, ambient temperature, PCB copper area, and board airflow; these values are not present in the verified data. In a vehicle or industrial enclosure, the 144-LQFP footprint can provide useful copper connectivity, but package size alone does not guarantee adequate thermal performance. Validate with the manufacturer's thermal model and a worst-case operating test before qualification.
Compliance Information
The verified data identifies automotive qualification but does not provide RoHS, REACH, AEC-Q100 classification, lead-free, halogen-free, or conflict-minerals statements. These fields remain unknown rather than inferred.
