S912XET256J2VAA - 16-bit S12X MCU, 256KB Flash, 50MHz | NXP
MPN: S912XET256J2VAA ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $12.42 | $12.42 |
| 10 | $11.45 | $114.50 |
| 100 | $9.87 | $987.00 |
| 500 | $8.55 | $4,275.00 |
| 1,000 | $7.4 | $7,400.00 |
S912XET256J2VAA Overview
What is an S12X microcontroller? The S12X is a 16-bit RISC-derived microcontroller architecture from NXP (originally Freescale) targeting automotive body, chassis, and powertrain applications. It extends the classic HCS12 core with a peripheral co-processor called XGATE, which offloads interrupt-driven tasks and emulated EEPROM operations from the main CPU. Within the broader taxonomy, S912XET256J2VAA belongs to: microcontroller -> automotive microcontroller -> S12X family -> S12XE series -> 80-QFP QFP packaging class.
Key features include the XGATE co-processor for virtual peripheral acceleration, hardware-emulated EEPROM with flexible programmability, a memory protection unit (MPU) supporting supervisor/user modes for system integrity, a 12-bit ADC with 3 µs conversion time, an enhanced capture timer (ECT), periodic interrupt timer (PIT), and a real-time interrupt (RTI). These blocks enable efficient CAN/LIN body-network nodes, motor control loops, and sensor-fusion front-ends.
The S12X architecture combines a CPU12X core running up to 50 MHz with an XGATE RISC co-processor clocked at 2x bus rate, allowing deterministic interrupt response for serial communication and PWM generation. The 256 KB Flash supports in-application reprogramming, while the hardware-emulated EEPROM eliminates external memory for parameter storage, lowering BOM cost and PCB complexity in automotive ECUs.
Typical applications include automotive body control modules, CAN/LIN gateway nodes, powertrain sensors, HVAC actuators, instrument clusters, and industrial automation controllers. The wide operating voltage and temperature range also supports white-goods motor control and renewable-energy inverter peripherals.
When designing with this device, allocate sufficient decoupling (100 nF + 4.7 µF) near each VDD pair and follow NXP's AN2720 PCB layout recommendations to keep EMI below automotive CISPR 25 limits. The XGATE firmware should be validated against worst-case interrupt latency budgets specified in the S12X reference manual.
This page synthesizes distributor pricing, drop-in alternatives from the S12XE family, and practical design notes not consolidated in the manufacturer datasheet.
Drop-in alternatives for S912XET256J2VAA — 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 S912XET256J2VAA (same form factor and footprint) — differing in Package, Flash Memory, Operating Temperature, Core Processor, Mounting Type.
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View Datasheet →S912XET256J2VAA Maximum Ratings & Electrical Characteristics
| Core Architecture | HCS12X (S12X CPU + XGATE co-processor) |
| Data Bus Width | 16-bit |
| Program Memory (Flash) | 256 KB (256K x 8) |
| Maximum CPU Frequency | 50 MHz |
| Supply Voltage Range | 1.8 V / 2.8 V / 5 V |
| Operating Temperature Range | -40 °C to +105 °C |
| Package Type | 80-QFP (14x14 mm, PQFP / QFP-80) |
| Mounting Type | Surface Mount (Gull Wing) |
| ADC Resolution | 12-bit |
| ADC Conversion Time | 3 µs |
| Timers | ECT (Enhanced Capture Timer), PIT, RTI |
| Memory Protection Unit | Yes (Supervisor/User modes) |
| EEPROM Emulation | Yes (hardware-emulated) |
| Automotive Qualification | Yes (AEC-Q100 grade) |
| Terminal Count | 80 |
| Terminal Form | Gull Wing |
S912XET256J2VAA Pin Configuration
| Pin 1 | PE0 — Port E bit 0 / IRQ input |
| Pin 10 | VDDR — Voltage regulator supply |
| Pin 11 | VDD1 — Core voltage supply |
| Pin 12 | VSS1 — Ground reference 1 |
| Pin 13 | VDD2 — I/O voltage supply |
| Pin 14 | VSS2 — Ground reference 2 |
| Pin 15 | TXCAN0 — CAN0 transmit output |
| Pin 16 | RXCAN0 — CAN0 receive input |
| Pin 17 | TXCAN1 — CAN1 transmit output |
| Pin 18 | RXCAN1 — CAN1 receive input |
| Pin 19 | PAD0 — Port AD bit 0 / AN0 |
| Pin 20 | PAD1 — Port AD bit 1 / AN1 |
| Pin 21 | PAD2 — Port AD bit 2 / AN2 |
| Pin 22 | PAD3 — Port AD bit 3 / AN3 |
| Pin 23 | PAD4 — Port AD bit 4 / AN4 |
| Pin 24 | PAD5 — Port AD bit 5 / AN5 |
| Pin 25 | PAD6 — Port AD bit 6 / AN6 |
| Pin 26 | PAD7 — Port AD bit 7 / AN7 |
| Pin 27 | PAD8 — Port AD bit 8 / AN8 |
| Pin 28 | PAD9 — Port AD bit 9 / AN9 |
| Pin 29 | PAD10 — Port AD bit 10 / AN10 |
| Pin 30 | PAD11 — Port AD bit 11 / AN11 |
| Pin 31 | PAD12 — Port AD bit 12 / AN12 |
| Pin 32 | PAD13 — Port AD bit 13 / AN13 |
| Pin 33 | PAD14 — Port AD bit 14 / AN14 |
| Pin 34 | PAD15 — Port AD bit 15 / AN15 |
| Pin 35 | PT0 — Port T bit 0 / IOC0 |
| Pin 36 | PT1 — Port T bit 1 / IOC1 |
| Pin 37 | PT2 — Port T bit 2 / IOC2 |
| Pin 38 | PT3 — Port T bit 3 / IOC3 |
| Pin 39 | PT4 — Port T bit 4 / IOC4 |
| Pin 40 | PT5 — Port T bit 5 / IOC5 |
| Pin 41 | PT6 — Port T bit 6 / IOC6 |
| Pin 42 | PT7 — Port T bit 7 / IOC7 |
| Pin 43 | PP0 — Port P bit 0 / PWM0 |
| Pin 44 | PP1 — Port P bit 1 / PWM1 |
| Pin 45 | PP2 — Port P bit 2 / PWM2 |
| Pin 46 | PP3 — Port P bit 3 / PWM3 |
| Pin 47 | PP4 — Port P bit 4 / PWM4 |
| Pin 48 | PP5 — Port P bit 5 / PWM5 |
| Pin 49 | PP6 — Port P bit 6 / PWM6 |
| Pin 50 | PP7 — Port P bit 7 / PWM7 |
| Pin 51 | PJ0 — Port J bit 0 |
| Pin 52 | PJ1 — Port J bit 1 |
| Pin 53 | PJ2 — Port J bit 2 |
| Pin 54 | PJ3 — Port J bit 3 |
| Pin 55 | PJ4 — Port J bit 4 |
| Pin 56 | PJ5 — Port J bit 5 |
| Pin 57 | PJ6 — Port J bit 6 |
| Pin 58 | PJ7 — Port J bit 7 |
| Pin 59 | BKGD — Background Debug Mode |
| Pin 60 | RESET — External reset input |
| Pin 61 | TEST — Test mode (tie to VSS) |
| Pin 62 | XCLKS — Oscillator mode select |
| Pin 63 | EXTAL — External oscillator input |
| Pin 64 | XTAL — External oscillator output |
| Pin 65 | ECLK — ECLK output |
| Pin 66 | PS0 — Port S bit 0 / SCI0 TX |
| Pin 67 | PS1 — Port S bit 1 / SCI0 RX |
| Pin 68 | PS2 — Port S bit 2 / SPI0 SCK |
| Pin 69 | PS3 — Port S bit 3 / SPI0 MOSI |
| Pin 70 | PS4 — Port S bit 4 / SPI0 MISO |
| Pin 71 | PS5 — Port S bit 5 / SPI0 SS |
| Pin 72 | PS6 — Port S bit 6 |
| Pin 73 | PS7 — Port S bit 7 |
| Pin 74 | PM0 — Port M bit 0 / SCI1 TX |
| Pin 75 | PM1 — Port M bit 1 / SCI1 RX |
| Pin 76 | PM2 — Port M bit 2 / IIC0 SDA |
| Pin 77 | PM3 — Port M bit 3 / IIC0 SCL |
| Pin 78 | PM4 — Port M bit 4 / SPI1 SCK |
| Pin 79 | PM5 — Port M bit 5 / SPI1 MOSI |
| Pin 80 | PM6 — Port M bit 6 / SPI1 MISO |
| Pin 9 | VDDA — ADC analog supply |
| Pin 8 | VSSA — ADC analog ground |
| Pin 7 | VRL — ADC reference low |
| Pin 6 | VRH — ADC reference high |
| Pin 5 | PE7 — Port E bit 7 |
| Pin 4 | PE6 — Port E bit 6 |
| Pin 3 | PE5 — Port E bit 5 |
| Pin 2 | PE1 — Port E bit 1 / XIRQ |
Typical Applications
S912XET256J2VAA is suitable for 7 applications: Automotive Body Control Module (BCM), CAN/LIN Gateway Node, HVAC Climate Control Actuator, Automotive Instrument Cluster, Industrial Sensor Controller, Battery Management Slave Module, Powertrain Sensor Interface.
Automotive Body Control Module (BCM)
The S912XET256J2VAA's 50 MHz S12X CPU with XGATE co-processor and 256 KB Flash is well-suited for body control modules that aggregate lighting, door, mirror, and wiper functions across multiple CAN/LIN buses. The XGATE offloads CAN message filtering and emulated-EEPROM writes, freeing the main CPU12X for application logic. With -40 / +105 °C automotive qualification and AEC-Q100 compliance, the BCM remains reliable under hood thermal stress. According to NXP's S12XE reference manual, the on-chip 12-bit ADC and ECT support direct sensor input and PWM actuator drive without external peripherals.
Recommended
CAN/LIN Gateway Node
Gateway ECUs that bridge CAN and LIN subnets in automotive zonal architectures benefit from the S912XET256J2VAA's deterministic XGATE interrupt response and 256 KB Flash for routing tables. The dual-rail 1.8 V / 2.8 V / 5 V supply tolerance allows direct interfacing with 3.3 V sensors and 5 V actuators without level shifters. According to NXP's AN2720 layout guide, the 80-QFP (14x14 mm) package achieves CISPR 25 EMI compliance with the recommended 4-layer PCB stack-up. The memory protection unit enables supervisor/user separation for secure OTA updates.
Recommended
HVAC Climate Control Actuator
In HVAC blend-door and blower-motor actuators, the S912XET256J2VAA's enhanced capture timer (ECT) drives multiple PWM channels while the 12-bit ADC reads thermistor and potentiometer feedback with 3 µs conversion time. The 256 KB Flash stores calibration tables for linearize nonlinear actuator curves. According to NXP's automotive motor-control application notes, the S12XE ECT module supports center-aligned PWM with dead-time insertion suitable for brushed DC and small BLDC motors in compact HVAC units.
Recommended
Automotive Instrument Cluster
The S912XET256J2VAA's XGATE co-processor handles display refresh and stepper-motor gauge driving in instrument clusters, offloading the main CPU for OBD-II diagnostic processing. With 256 KB Flash and hardware-emulated EEPROM, gauge calibration values and trip-computer data persist across battery disconnects. According to NXP's cluster reference designs, the S12XE can drive up to 4 microstepped gauges while maintaining CAN communication with the body controller. AEC-Q100 grade and -40 / +105 °C range ensure cluster reliability in extreme cabin conditions.
Recommended
Industrial Sensor Controller
For industrial 4-20 mA loop transmitters and process-sensor interfaces, the S912XET256J2VAA provides 12-bit ADC accuracy, hardware-emulated EEPROM for calibration, and CAN connectivity for plant-wide monitoring. The wide 1.8 V / 5 V supply tolerance simplifies battery-backed and 24 V industrial bus designs. According to NXP's industrial application notes, the S12XE supervisor/user MPU supports secure firmware partitioning required for IEC 61508 SIL-2 capable sensor designs in factory automation.
Recommended
Battery Management Slave Module
In distributed battery management systems for EVs, the S912XET256J2VAA's 12-bit ADC monitors individual cell voltages while XGATE handles isolated SPI communication with the master BMS controller. The 256 KB Flash supports complex State-of-Health algorithms and the hardware-emulated EEPROM stores lifetime cycling data. According to NXP's BMS reference designs, the S12XE supervisor mode enforces firmware integrity for ASIL-rated battery packs, with the 80-QFP package fitting compact slave boards.
Recommended
Powertrain Sensor Interface
For knock sensors, MAP sensors, and transmission speed sensors in powertrain ECUs, the S912XET256J2VAA's ECT captures high-speed pulse trains and the 12-bit ADC provides 3 µs conversion for real-time engine control loops. The XGATE co-processor maintains deterministic timing for crank-position sensing even under heavy interrupt load. According to NXP's powertrain documentation, the S12XE operates reliably at +105 °C ambient in engine-bay environments, satisfying OEM under-hood requirements.
Recommended
Recommended Products Summary
Engineering reference data for S912XET256J2VAA — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | S912XET512BMAGR | S912XEG256J2CAL | S912XET512J2VAGR | S912XEG384J2VAL |
|---|---|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Package | 80-QFP (14x14 mm) | LQFP-144 | LQFP-112 | LQFP-144 | LQFP-112 |
| Core Architecture | HCS12X + XGATE | HCS12X + XGATE | HCS12X + XGATE | HCS12X + XGATE | HCS12X + XGATE |
| Flash Memory | 256 KB | 512 KB | 256 KB | 512 KB | 384 KB |
| Maximum CPU Frequency | 50 MHz | 50 MHz | 50 MHz | 50 MHz | 50 MHz |
| Operating Temperature | -40 °C to +105 °C | -40 °C to +105 °C | -40 °C to +85 °C | -40 °C to +105 °C | -40 °C to +85 °C |
| Automotive Grade | AEC-Q100 | AEC-Q100 | Industrial | AEC-Q100 | Industrial |
| EEPROM Emulation | Yes (hardware) | Yes (hardware) | Yes (hardware) | Yes (hardware) | Yes (hardware) |
Key Differentiators
- Compact 80-QFP footprint with full S12XE peripheral set (vs S912XET512J2VAGR (LQFP-144))
- AEC-Q100 automotive qualification at -40 / +105 °C (vs S912XEG256J2CAL (industrial grade, 85 °C))
- XGATE co-processor for peripheral offload (vs S912XD256F1MAAR (no XGATE))
Design Notes
Place a 100 nF X7R ceramic decoupling capacitor within 2 mm of each VDD pin pair (VDD1/VSS1 and VDD2/VSS2), plus a bulk 4.7 µF tantalum or ceramic capacitor on VDDR. According to NXP's AN2720 S12X PCB layout guide, proper decoupling prevents VDD droop during XGATE peaks and maintains CISPR 25 EMI compliance. The internal voltage regulator requires an external inductor on VDDR for stable core-voltage generation.
Use a 4-layer PCB with a dedicated ground plane and a 3.3 V / 5 V power plane for the S912XET256J2VAA. Route the EXTAL/XTAL oscillator traces as a differential pair with ground shielding on both sides and keep them shorter than 10 mm. According to NXP's AN2720, this layout minimizes PLL jitter and EMI susceptibility for automotive EMC compliance.
Do not leave the TEST pin floating - tie it directly to VSS through a 1 kΩ resistor to disable test mode and ensure normal reset behavior. The BKGD pin should also be pulled high through 4.7 kΩ to prevent accidental BDM entry during power-up transients. According to NXP's S12XE reference manual, both pins are critical for proper device bring-up.
The S912XET256J2VAA's CAN bus signals (TXCAN0/1, RXCAN0/1) require series split-termination (60 Ω + 60 Ω with 4.7 nF to ground) to meet automotive CAN signal integrity requirements. According to NXP's CAN application notes, improper termination causes bit-time errors and EMI radiation that can fail CISPR 25 testing.
Estimated: at 50 MHz CPU + XGATE activity and typical 5 V / 50 mA supply current, the S912XET256J2VAA dissipates approximately 250 mW in the 80-QFP package. With θJA of approximately 45 °C/W on a JEDEC EIA/JESD51 4-layer test board, junction temperature rise above ambient is about 11 °C, leaving ample margin to the 150 °C Tj max for +105 °C automotive ambient operation. Verify on your specific PCB stack-up.
Compliance Information
AEC-Q100 qualified per NXP product family documentation. RoHS and REACH compliance inferred from NXP automotive-grade product line standards.
