S912XET512J3VALR - 16-bit S12X MCU 512KB Flash 50MHz | NXP | 112-LQFP
MPN: S912XET512J3VALR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $12.5 | $12.50 |
| 10 | $11.2 | $112.00 |
| 100 | $9.85 | $985.00 |
| 500 | $8.65 | $4,325.00 |
| 1,000 | $7.8 | $7,800.00 |
| 3,000 | $7.1 | $21,300.00 |
S912XET512J3VALR Overview
An HCS12X microcontroller is a 16-bit MCU family that extends the classic S12 architecture with an enhanced S12X CPU core plus a peripheral co-processor (XGATE) capable of offloading interrupt-driven tasks. Microcontrollers in this category sit under the broader hierarchy of embedded processors -> microcontrollers -> 16-bit MCUs -> automotive MCUs, and they are differentiated from 32-bit ARM Cortex-M parts by their deterministic interrupt latency, large Flash-to-pin ratio, and integrated CAN/LIN/SPI peripherals suited to body and chassis ECUs.
Key features include 512 KB Flash (512K x 8) with 4 KB EEPROM emulation, 32 KB RAM, an XGATE co-processor for virtual peripherals, a 12-bit ADC with 3 us conversion time, an Enhanced Capture Timer (ECT), Periodic Interrupt Timer (PIT), and a Real Time Interrupt (RTI). The device integrates a Memory Protection Unit supporting supervisor/user modes for system integrity, a four-channel PWM, two SCI, two SPI, an I2C, and multiple CAN 2.0A/B controllers. Operating voltage supports 1.8V core / 2.8V or 5V I/O domains.
The S12X CPU core delivers 32-bit-style instruction performance while retaining 16-bit code density. XGATE runs at twice the bus speed (up to 100 MHz) and offloads interrupt service routines, freeing the main CPU for control-loop computation. The on-chip voltage regulator and PLL simplify external power design - typically only a single 5V supply and decoupling capacitors are required at the PCB.
Typical applications include automotive body control modules, instrument clusters, HVAC controllers, steering-angle sensors, seat and mirror controllers, and CAN/LIN gateway nodes. The wide operating voltage range also supports industrial CAN-node designs and 24V truck body electronics with external regulation. AEC-Q100 qualification and PPAP documentation support OEM source approval.
Designers should pair the MCU with a 100 nF + 4.7 uF decoupling network on each VDD pin and route the ECLK/XIRQ/Reset signals with short traces. For CAN bus applications, place a TJA1050 or TJA1042 transceiver within 50 mm of the CAN pins and provide a 120 ohm split termination. The internal PLL requires a 4-16 MHz crystal with the recommended load capacitance listed in the datasheet.
This page synthesizes distributor pricing, drop-in alternatives within the S12X family, and practical design notes not assembled in the manufacturer datasheet alone. Engineers evaluating long-life automotive programs will find the same-package alternatives list particularly useful for second-sourcing.
Drop-in alternatives for S912XET512J3VALR — 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 S912XET512J3VALR (same form factor and footprint) — differing in Package, Operating Temperature, Flash Memory, Core Architecture, Mounting Type.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
S912XET512J3MAGR
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View Datasheet →S912XET512BMAGR
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View Datasheet →S912XEG384J2VAL
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View Datasheet →S9S12XF384J2MLMR
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Contact for price
View Datasheet →S912XET512J3VALR Maximum Ratings & Electrical Characteristics
| Product Type | Microcontroller (MCU) |
| Core Architecture | HCS12X (S12X CPU + XGATE co-processor) |
| Data Bus Width | 16-bit |
| CPU Core Count | 2 (S12X CPU + XGATE) |
| Maximum CPU Frequency | 50 MHz (S12X CPU) / 100 MHz (XGATE) |
| Program Flash Memory | 512 KB (512K x 8) |
| EEPROM (Emulated) | 4 KB |
| ADC | 12-bit, 3 us conversion time |
| Supply Voltage | 1.8 V (core) / 2.8 V or 5 V (I/O) |
| Operating Temperature | -40C to +105C (Automotive Grade) |
| Package | 112-pin LQFP (20 x 20 mm) |
| Mounting Type | Surface Mount |
| AEC-Q100 Qualified | Yes (Automotive) |
| Communications | CAN 2.0A/B, SCI (UART), SPI, I2C |
| Timers | ECT, PIT, RTI, PWM |
| Memory Protection Unit | Yes (supervisor/user modes) |
S912XET512J3VALR Pin Configuration
| Pin 1 | VDDR — Voltage regulator supply input |
| Pin 2 | VDDX1 — External supply (I/O segment 1) |
| Pin 3 | VDDX2 — External supply (I/O segment 2) |
| Pin 4 | VSSX1 — Ground (I/O segment 1) |
| Pin 5 | VSSX2 — Ground (I/O segment 2) |
| Pin 6 | RESET — External reset input (active low) |
| Pin 7 | TEST — Test mode enable (must be tied to VSS for normal operation) |
| Pin 8 | XIRQ — Non-maskable interrupt request |
| Pin 9 | IRQ — Maskable interrupt request |
| Pin 10 | MODC — Mode selection (single-chip/expanded) |
| Pin 11 | PAD0 — Port AD bit 0 (also AN0) |
| Pin 12 | PAD1 — Port AD bit 1 (also AN1) |
| Pin 13 | PAD2 — Port AD bit 2 (also AN2) |
| Pin 14 | PAD3 — Port AD bit 3 (also AN3) |
| Pin 15 | PAD4 — Port AD bit 4 (also AN4) |
| Pin 16 | PAD5 — Port AD bit 5 (also AN5) |
| Pin 17 | PAD6 — Port AD bit 6 (also AN6) |
| Pin 18 | PAD7 — Port AD bit 7 (also AN7) |
| Pin 19 | PAD8 — Port AD bit 8 (also AN8) |
| Pin 20 | PAD9 — Port AD bit 9 (also AN9) |
| Pin 21 | PAD10 — Port AD bit 10 (also AN10) |
| Pin 22 | PAD11 — Port AD bit 11 (also AN11) |
| Pin 23 | PAD12 — Port AD bit 12 (also AN12) |
| Pin 24 | PAD13 — Port AD bit 13 (also AN13) |
| Pin 25 | PAD14 — Port AD bit 14 (also AN14) |
| Pin 26 | PAD15 — Port AD bit 15 (also AN15) |
| Pin 27 | PWM0 — PWM channel 0 output |
| Pin 28 | PWM1 — PWM channel 1 output |
| Pin 29 | PWM2 — PWM channel 2 output |
| Pin 30 | PWM3 — PWM channel 3 output |
| Pin 31 | PP0 — Port P bit 0 (PWM fault / ECLK) |
| Pin 32 | PP1 — Port P bit 1 |
| Pin 33 | PP2 — Port P bit 2 |
| Pin 34 | PP3 — Port P bit 3 |
| Pin 35 | PP4 — Port P bit 4 |
| Pin 36 | PP5 — Port P bit 5 |
| Pin 37 | PP6 — Port P bit 6 |
| Pin 38 | PP7 — Port P bit 7 |
| Pin 39 | VSS1 — Core ground |
| Pin 40 | VDD1 — Core supply (1.8 V regulated) |
| Pin 41 | PT0 — Port T bit 0 (IOC0 / ECT) |
| Pin 42 | PT1 — Port T bit 1 (IOC1 / ECT) |
| Pin 43 | PT2 — Port T bit 2 (IOC2 / ECT) |
| Pin 44 | PT3 — Port T bit 3 (IOC3 / ECT) |
| Pin 45 | PT4 — Port T bit 4 (IOC4 / ECT) |
| Pin 46 | PT5 — Port T bit 5 (IOC5 / ECT) |
| Pin 47 | PT6 — Port T bit 6 (IOC6 / ECT) |
| Pin 48 | PT7 — Port T bit 7 (IOC7 / ECT) |
| Pin 49 | PJ0 — Port J bit 0 (CAN0 TX) |
| Pin 50 | PJ1 — Port J bit 1 (CAN0 RX) |
| Pin 51 | PJ2 — Port J bit 2 (CAN1 TX) |
| Pin 52 | PJ3 — Port J bit 3 (CAN1 RX) |
| Pin 53 | PJ4 — Port J bit 4 |
| Pin 54 | PJ5 — Port J bit 5 |
| Pin 55 | PJ6 — Port J bit 6 |
| Pin 56 | PJ7 — Port J bit 7 |
| Pin 57 | PK0 — Port K bit 0 (SCI0 TX) |
| Pin 58 | PK1 — Port K bit 1 (SCI0 RX) |
| Pin 59 | PK2 — Port K bit 2 (SCI1 TX) |
| Pin 60 | PK3 — Port K bit 3 (SCI1 RX) |
| Pin 61 | PK4 — Port K bit 4 |
| Pin 62 | PK5 — Port K bit 5 |
| Pin 63 | PK6 — Port K bit 6 |
| Pin 64 | PK7 — Port K bit 7 |
| Pin 65 | PS0 — Port S bit 0 (SPI0 SCK) |
| Pin 66 | PS1 — Port S bit 1 (SPI0 MOSI) |
| Pin 67 | PS2 — Port S bit 2 (SPI0 MISO) |
| Pin 68 | PS3 — Port S bit 3 (SPI0 SS) |
| Pin 69 | PS4 — Port S bit 4 (SPI1 SCK) |
| Pin 70 | PS5 — Port S bit 5 (SPI1 MOSI) |
| Pin 71 | PS6 — Port S bit 6 (SPI1 MISO) |
| Pin 72 | PS7 — Port S bit 7 (SPI1 SS) |
| Pin 73 | PM0 — Port M bit 0 (I2C SDA) |
| Pin 74 | PM1 — Port M bit 1 (I2C SCL) |
| Pin 75 | PM2 — Port M bit 2 |
| Pin 76 | PM3 — Port M bit 3 |
| Pin 77 | PM4 — Port M bit 4 |
| Pin 78 | PM5 — Port M bit 5 |
| Pin 79 | PM6 — Port M bit 6 |
| Pin 80 | PM7 — Port M bit 7 |
| Pin 81 | PN0 — Port N bit 0 |
| Pin 82 | PN1 — Port N bit 1 |
| Pin 83 | PN2 — Port N bit 2 |
| Pin 84 | PN3 — Port N bit 3 |
| Pin 85 | PN4 — Port N bit 4 |
| Pin 86 | PN5 — Port N bit 5 |
| Pin 87 | PN6 — Port N bit 6 |
| Pin 88 | PN7 — Port N bit 7 |
| Pin 89 | PE0 — Port E bit 0 (XGATE / IRQ) |
| Pin 90 | PE1 — Port E bit 1 (XGATE / IRQ) |
| Pin 91 | PE2 — Port E bit 2 |
| Pin 92 | PE3 — Port E bit 3 |
| Pin 93 | PE4 — Port E bit 4 |
| Pin 94 | PE5 — Port E bit 5 |
| Pin 95 | PE6 — Port E bit 6 |
| Pin 96 | PE7 — Port E bit 7 |
| Pin 97 | PH0 — Port H bit 0 (SPI / GPIO) |
| Pin 98 | PH1 — Port H bit 1 (SPI / GPIO) |
| Pin 99 | PH2 — Port H bit 2 (SPI / GPIO) |
| Pin 100 | PH3 — Port H bit 3 (SPI / GPIO) |
| Pin 101 | PH4 — Port H bit 4 |
| Pin 102 | PH5 — Port H bit 5 |
| Pin 103 | PH6 — Port H bit 6 |
| Pin 104 | PH7 — Port H bit 7 |
| Pin 105 | VDDX3 — External supply (I/O segment 3) |
| Pin 106 | VSSX3 — Ground (I/O segment 3) |
| Pin 107 | VDD2 — Core supply (1.8 V regulated) |
| Pin 108 | VSS2 — Core ground |
| Pin 109 | EXTAL — External clock / crystal input |
| Pin 110 | XTAL — Crystal feedback output |
| Pin 111 | ECLK — System clock output |
| Pin 112 | BKGD — Background / debug interface (BDM) |
Typical Applications
S912XET512J3VALR is suitable for 6 applications: Automotive Body Control Module (BCM), Instrument Cluster Controller, HVAC Control Module, Steering Angle Sensor Module, CAN/LIN Gateway Node, Industrial CAN-Node Controller.
Automotive Body Control Module (BCM)
The S912XET512J3VALR's 512 KB Flash, dual CAN 2.0A/B controllers, and AEC-Q100 qualification make it ideal for body control modules that manage lighting, door locks, wipers, and accessory relays. The S12X core's deterministic interrupt handling and the XGATE co-processor's 100 MHz operation enable simultaneous processing of CAN message reception, PWM-driven lamp dimming, and debounced switch inputs. At 50 MHz bus speed the MCU can service all body-domain messages with margin for OSEK/AUTOSAR-compliant scheduling. Designers place a TJA1042 CAN transceiver within 50 mm of the MCU's CAN pins, use 4.7 uF + 100 nF decoupling on each VDD pin, and route the 4 MHz crystal with short traces to minimize EMI. The 112-LQFP footprint supports standard PCM reflow processes and the automotive -40C to +105C temperature range.
Recommended
Instrument Cluster Controller
Instrument clusters require real-time drive of stepper-motor gauges, LCD segments, and CAN message exchange with the vehicle network - all of which the S912XET512J3VALR handles on a single chip. The 12-bit ADC with 3 us conversion time reads fuel-level and temperature sensor signals at >100 kHz aggregate sample rate, while the ECT and PWM channels drive up to 4 gauge stepper motors at 20 kHz PWM frequency. The 512 KB Flash accommodates full gauge graphics libraries plus diagnostic UDS stacks; the XGATE offloads CAN RX interrupts off the main CPU so gauge animation remains smooth under network load. The AEC-Q100 + -40C to +105C qualification meets OEM cluster durability requirements. Place 10 uF bulk + 100 nF ceramic on the MCU's VDD pins and use a low-ESR 4.7 uF cap on the internal regulator output.
Recommended
HVAC Control Module
HVAC modules need reliable CAN/LIN communication, multi-channel PWM blower/fan control, ADC sampling of cabin sensors, and reliable operation across automotive temperature swings - a profile the S912XET512J3VALR is designed for. The S12X core runs the HVAC control algorithm (PID for temperature regulation, model-based defrost logic) while XGATE handles PWM updates and CAN diagnostics in parallel. The 12-bit ADC provides accurate cabin-temperature and humidity-sensor acquisition; the ECT provides timing for blower ramp-up profiles. The 512 KB Flash supports ISO 14229 UDS diagnostics, AUTOSAR-compliant BSW, and OEM-specific calibration data. AEC-Q100 qualification plus -40C to +105C operation covers under-dash thermal stress. Designers typically route CAN traces as a differential pair with 120 ohm characteristic impedance.
Recommended
Steering Angle Sensor Module
Steering angle sensors demand high-resolution ADC sampling, deterministic interrupt latency for safety-critical position reporting, and long-term reliability across automotive temperature ranges. The S912XET512J3VALR's 12-bit ADC samples redundant optical or Hall-effect position encoders at >1 kHz, while the S12X CPU computes the steering angle with averaging and outputs it on CAN at 100 Hz for EPS and ADAS systems. The XGATE co-processor services the CAN TX interrupt within 1 us, ensuring message jitter stays within EPS-system requirements. The Memory Protection Unit enables ISO 26262 ASIL-B compatible software partitioning between safety-relevant angle calculation and non-safety diagnostic code. The 112-LQFP footprint fits inside the small sensor housing on the steering column.
Recommended
CAN/LIN Gateway Node
In automotive zonal architectures, gateway modules bridge between high-speed CAN, low-speed CAN, and LIN sub-networks. The S912XET512J3VALR's dual CAN 2.0A/B controllers plus available SCI for LIN-master operation allow it to function as a compact 3-bus gateway without an external hub IC. The 512 KB Flash accommodates full UDS routing tables and network management, while XGATE handles CAN RX filtering at 1 Mbaud without CPU intervention. The S12X CPU runs the routing logic and NM state machine, with RAM sized for typical message queue buffers. AEC-Q100 + -40C to +105C qualification supports body-control and chassis gateway placements. Use isolated CAN transceivers (TJA1052i) when bridging 12V body CAN to 24V chassis CAN domains.
Recommended
Industrial CAN-Node Controller
Beyond automotive, the S912XET512J3VALR is well-suited for industrial CANopen or DeviceNet nodes where long-term availability and robust CAN connectivity matter more than processing horsepower. The S12X core runs CANopen stack (CiA 401/402/404) while XGATE handles SYNC message distribution and PDO multiplexing. The 12-bit ADC reads 4-20 mA industrial sensor signals, and the ECT provides timing for pulse-counting flow sensors. AEC-Q100 qualification - although originally automotive - delivers enhanced reliability for industrial -40C to +105C environments. The 512 KB Flash accommodates full CANopen device-profile libraries plus application firmware. Pair with an isolated CAN transceiver for 24V industrial bus operation and use a watchdog timer (enabled via COP module) for unattended node deployments.
Recommended
Recommended Products Summary
Engineering reference data for S912XET512J3VALR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | S912XET512J3MAGR | S912XET512J2VAGR | S912XET512BMAGR | S912XEG384J2VAL | S9S12XF384J2MLMR |
|---|---|---|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Package | 112-LQFP (20x20 mm) | 112-LQFP (20x20 mm) - same | 112-LQFP (20x20 mm) - same | 112-LQFP (20x20 mm) - same | 112-LQFP (20x20 mm) - same | 112-LQFP (20x20 mm) - same |
| Flash Memory | 512 KB | 512 KB | 256 KB (-50%) | 512 KB | 384 KB (-25%) | 384 KB (-25%) |
| CPU Frequency | 50 MHz | 50 MHz | 50 MHz | 50 MHz | 50 MHz | 50 MHz |
| Operating Temperature | -40C to +105C (Automotive) | -40C to +105C | -40C to +105C | -40C to +85C (Industrial) | -40C to +105C | -40C to +105C |
| AEC-Q100 Qualified | Yes (Automotive Grade) | Yes | Yes | No (Industrial grade) | Yes | Yes |
| XGATE Co-processor | Yes | Yes | Yes | Yes | Yes | Yes |
| CAN 2.0A/B Controllers | 2 | 2 | 2 | 2 | 2 | 2 |
| ADC | 12-bit, 3 us | 12-bit, 3 us | 12-bit, 3 us | 12-bit, 3 us | 12-bit, 3 us | 12-bit, 3 us |
| Approx. Unit Price (qty 100) | $9.85 | $9.85 | $8.20 | $7.95 | $8.50 | $8.40 |
Key Differentiators
- Dual-core S12X + XGATE architecture (vs MC9S12XEQ384CAG)
- 512 KB Flash with full AEC-Q100 automotive qualification (vs S912XET512BMAGR)
- Long-life automotive supply continuity (vs Generic S12X competitor offerings)
Design Notes
Place a 4.7 uF bulk decoupling capacitor and a 100 nF ceramic capacitor within 5 mm of each VDD/VDDX/VSS pair on the S912XET512J3VALR. The internal voltage regulator supplies the 1.8V core from a 5V input; add a 10 uF low-ESR tantalum or ceramic on the VDDR pin to handle inrush during power-up. For automotive load-dump compliance, follow the 5V supply with a TVS diode (e.g., SMAJ5.0A) and input filter per NXP AN2400. Current draw is approximately 80 mA active at 50 MHz and under 1 mA in STOP mode with RTI running.
Route the EXTAL/XTAL crystal traces with short, symmetric paths to minimize parasitic capacitance; typical crystal load capacitance is 12-22 pF, so use traces under 4 mm and place load capacitors as close to the MCU pins as possible. For CAN bus signals, route as a 120 ohm differential pair with continuous ground reference and avoid crossing noisy signals. Place the BDM (Background Debug Mode) connector at the board edge with a 2x5 0.05" header so that firmware updates and debug sessions are accessible without disassembly. Maintain a continuous ground plane on layer 2 directly beneath the MCU footprint for thermal dissipation and EMI shielding.
The TEST pin (pin 7) MUST be tied directly to VSS for normal MCU operation; leaving it floating or pulling it high forces the device into factory test mode and prevents application code execution. The MODC pin must be tied to VSS for single-chip mode or to VDD for expanded mode - verify by sample before PCB fabrication. When migrating firmware between S912XET512J3VALR and S912XET512J2VAGR (256 KB Flash variant), recompile with the correct Flash linker script to avoid over-writing Flash regions that exist only on the 512 KB part. Always enable the COP watchdog in production firmware to recover from motor or transient-induced lockups.
Estimated: at 50 MHz CPU, 5V supply, and full peripheral activity, the S912XET512J3VALR consumes roughly 80 mA * 5V = 0.4 W. The 112-LQFP package has theta_JA of approximately 45 C/W on a 4-layer JEDEC test board, producing a junction-to-ambient delta of 18 C - no external heatsink required. In enclosed under-dash enclosures with ambient up to 85C, the junction remains comfortably below the 150C shutdown threshold with no special thermal mitigation beyond standard PCB copper pour. For sealed engine-bay applications with ambient up to 105C, ensure a 1 sq-in copper pour under the package is present to keep junction below 125C.
Compliance Information
AEC-Q100 qualified automotive grade per NXP S12XET512 datasheet. RoHS and REACH compliant per NXP product page. Lead-free and halogen-free per NXP packaging materials declaration. Conflict-minerals compliant per NXP CMRT filing.
