S912XEQ384J3VAG - 16-bit S12X MCU, 384KB Flash, 50MHz, 144-LQFP | NXP
MPN: S912XEQ384J3VAG ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $18.5 | $18.50 |
| 10 | $16.8 | $168.00 |
| 100 | $14.95 | $1,495.00 |
| 500 | $13.4 | $6,700.00 |
| 1,000 | $11.85 | $11,850.00 |
S912XEQ384J3VAG Overview
An MCU (Microcontroller Unit) is a single-chip computer that integrates a CPU core, non-volatile program memory (Flash), working RAM, and a rich set of analog and digital peripherals. The HCS12X family extends the classic HCS12 architecture with the XGATE peripheral co-processor, an auxiliary RISC engine that offloads interrupt-driven I/O tasks from the main CPU to boost overall system throughput. Within the broader taxonomy, the S912XEQ384J3VAG sits under HCS12X -> S12X family -> 16-bit automotive MCU -> embedded microcontroller -> semiconductor.
Key differentiating features include a 12-bit ADC with 3 us conversion time, an Enhanced Capture Timer (ECT) module, a Periodic Interrupt Timer (PIT), a Real-Time Interrupt (RTI), an XGATE co-processor for virtual peripherals, and flexible hardware-emulated EEPROM. System integrity is reinforced by a Memory Protection Unit (MPU) and supervisor/user execution modes, which are critical for ISO 26262-oriented automotive functional safety designs.
Typical applications include automotive body controllers, CAN/LIN gateway nodes, instrument clusters, HVAC control modules, and industrial CAN-node endpoints. The 144-LQFP package exposes a generous I/O count and multiple timer/capture channels, which suit multi-sensor automotive designs.
When designing with this device, reserve sufficient Flash endurance margin for the emulated EEPROM workload, and verify that the XGATE firmware is loaded alongside the S12X application image. Decoupling and ground-plane layout directly impact ADC noise performance - keep analog and digital return paths separated.
This page synthesizes distributor pricing, AEC-Q100 status, application-fit context, and drop-in alternative candidates into a single reference not duplicated on the manufacturer datasheet, helping engineers and buyers make an informed part-selection decision.
Drop-in alternatives for S912XEQ384J3VAG — 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 S912XEQ384J3VAG (same form factor and footprint) — differing in Package, Operating Temperature, Flash Memory, Core Processor, EEPROM.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MC9S12XEQ384CAG
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View Datasheet →S912XEG384J2VAL
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View Datasheet →S912XET512J2VAGR
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View Datasheet →S912XET256J2VAG
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View Datasheet →S9S12XF384J2MLMR
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View Datasheet →S912XEQ384J3VAG Maximum Ratings & Electrical Characteristics
| Core Architecture | HCS12X (S12X CPU) |
| Data Bus Width | 16-bit |
| CPU Clock Speed (Bus) | 50 MHz |
| Program Memory (Flash) | 384 KB (384K x 8) |
| EEPROM | Hardware-emulated (flexible, programmable) |
| Co-Processor | XGATE peripheral co-processor |
| ADC | 12-bit, 3 us conversion time |
| Timers | Enhanced Capture Timer (ECT), PIT, RTI |
| Memory Protection | MPU + supervisor/user modes |
| Supply Voltage | 1.8 V / 2.8 V / 5 V |
| Operating Temperature | -40 C to +105 C |
| Automotive Qualification | AEC-Q100 qualified |
| Package | 144-pin LQFP (20x20 mm) |
| Mounting Type | Surface Mount |
| Terminal Form | Gull Wing |
| Package Code (JEDEC) | LFQFP |
| RoHS Status | Compliant |
S912XEQ384J3VAG lfqfp Pin Configuration Guide
Pin configuration for S912XEQ384J3VAG (lfqfp 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 S912XEQ384J3VAG.
Refer to the datasheet for full pin configuration.
Typical Applications
S912XEQ384J3VAG is suitable for 6 applications: Automotive Body Control Module (BCM), CAN/LIN Gateway Node, Instrument Cluster Controller, HVAC Control Module, Industrial CAN-Node Endpoint, Automotive Seat Control Module.
Automotive Body Control Module (BCM)
The S912XEQ384J3VAG fits BCM designs where 384 KB Flash comfortably hosts the application, bootloader, and CAN/LIN stack, while the 50 MHz S12X core and XGATE co-processor offload interrupt-heavy PWM, timer capture, and switch-debounce routines. Its AEC-Q100 qualification and -40 C to +105 C range cover under-hood and cabin environments, and the 12-bit ADC with 3 us conversion samples current shunts, thermistors, and rotary position sensors in body-domain ECUs. Compared with switching to a Cortex-M part, the BCM developer reuses legacy S12X firmware and toolchains.
Recommended
CAN/LIN Gateway Node
In a CAN/LIN gateway, the S912XEQ384J3VAG's 384 KB Flash holds gateway routing tables, UDS stack, and diagnostic services, while the S12X core's deterministic interrupt latency supports message-rate forwarding at 500 kbps CAN. The XGATE co-processor accelerates mailbox servicing and timing-critical protocol handling, leaving the main CPU free for diagnostics and security functions. The 144-LQFP exposes enough CAN/LIN/UART channels for multi-bus gateway topologies without external bus muxes.
Recommended
Instrument Cluster Controller
The S912XEQ384J3VAG drives small instrument-cluster stepper motors, gauge backlights, and warning-lamp LED drivers via its ECT/PWM channels, while the 12-bit ADC reads fuel-level and temperature sensors. The 384 KB Flash holds the cluster graphics state machine, while 32 KB emulated EEPROM retains trip odometer and user preferences across battery disconnects. Compared with higher-end cluster MCUs, the S912XEQ384J3VAG offers the right I/O mix for entry- and mid-tier cluster platforms at automotive-grade reliability.
Recommended
HVAC Control Module
HVAC modules use the S912XEQ384J3VAG to drive blower PWM channels, read cabin NTC thermistors via the 12-bit ADC, and communicate with the vehicle CAN bus. The XGATE co-processor manages high-frequency PWM updates and ADC scan sequences without burdening the main CPU, while 384 KB Flash fits the HVAC application plus calibration tables. AEC-Q100 qualification and the -40 C to +105 C range cover cabin and engine-adjacent HVAC installations.
Recommended
Industrial CAN-Node Endpoint
For industrial CANopen endpoints (sensors, motor starters, valve controllers), the S912XEQ384J3VAG provides a robust 16-bit core with industrial-grade temperature range and emulated EEPROM for parameter storage. The 144-LQFP exposes generous GPIO for digital I/O, the 12-bit ADC reads 4-20 mA loop signals, and the ECT/PWM timers drive solenoids and small motors. Fieldbus firmware (CANopen / DeviceNet stacks) fits comfortably in 384 KB Flash.
Recommended
Automotive Seat Control Module
Seat-control modules use the S912XEQ384J3VAG to drive multiple brushed DC motors for seat position, lumbar, and recline via PWM channels, while CAN/LIN comms carry body-network commands. The emulated EEPROM retains seat memory presets across battery disconnects, the MPU provides supervisor-mode isolation of safety routines, and AEC-Q100 +105 C tolerance handles seat-heater thermal environments. The 144-LQFP footprint is shared across seat platforms, simplifying PCB reuse.
Recommended
Recommended Products Summary
Engineering reference data for S912XEQ384J3VAG — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MC9S12XEQ384CAG | S912XEG384J2VAL | S912XET512J2VAGR | S912XET256J2VAG | S9S12XF384J2MLMR |
|---|---|---|---|---|---|---|
| Package | 144-LQFP (20x20 mm) | 144-LQFP (20x20 mm) - same | 144-LQFP (20x20 mm) - same | 144-LQFP (20x20 mm) - same | 144-LQFP (20x20 mm) - same | 144-LQFP (20x20 mm) - same |
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Flash Memory | 384 KB | 384 KB - identical | 384 KB - identical | 512 KB (+33%) | 256 KB (-33%) | 384 KB - identical |
| CPU Bus Speed | 50 MHz | 50 MHz - identical | 50 MHz - identical | 50 MHz - identical | 50 MHz - identical | 50 MHz - identical |
| Core Architecture | S12X (HCS12X) 16-bit | S12X (HCS12X) 16-bit - identical | S12X (HCS12X) 16-bit - identical | S12X (HCS12X) 16-bit - identical | S12X (HCS12X) 16-bit - identical | S12XF (HCS12X) 16-bit |
| XGATE Co-Processor | Yes | Yes - identical | Yes - identical | Yes - identical | Yes - identical | Yes - identical |
| Automotive Qualification | AEC-Q100 | AEC-Q100 - identical | AEC-Q100 - identical | AEC-Q100 - identical | AEC-Q100 - identical | AEC-Q100 - identical |
| Operating Temperature | -40 C to +105 C | -40 C to +85 C (older spec) | -40 C to +105 C - identical | -40 C to +105 C - identical | -40 C to +105 C - identical | -40 C to +105 C - identical |
| Supply Voltage | 1.8 / 2.8 / 5 V | 1.8 / 2.8 / 5 V - identical | 1.8 / 2.8 / 5 V - identical | 1.8 / 2.8 / 5 V - identical | 1.8 / 2.8 / 5 V - identical | 1.8 / 2.8 / 5 V - identical |
Key Differentiators
- Cost-optimized Flash size in 144-LQFP (vs S912XET512J2VAGR)
- Modern NXP S9S prefix for fresh BOMs (vs MC9S12XEQ384CAG)
- Identical 144-LQFP footprint across S12X siblings (vs MC9S12XEQ384CAG)
- XGATE co-processor retained at lower Flash tier (vs S912XET256J2VAG)
Design Notes
Estimated: at 50 MHz bus with all peripherals active, the S912XEQ384J3VAG core current draw is in the order of 50-70 mA from the 5 V rail (per typical S12XE-family datasheet figures). Add at least a 100 nF decoupling capacitor on every VDD/VSS pair plus a 4.7 uF bulk cap on the main 5 V and 2.5 V analog rails to suppress switching transients when the XGATE co-processor activates from idle.
Route the analog AGND/AVSS plane directly under the ADC pins and stitch it to the digital GND plane at a single point near the MCU's GND pin. This star-ground topology minimizes ADC conversion noise caused by return-current coupling from the 50 MHz S12X core. Place the 12-bit ADC reference decoupling capacitor (typically 100 nF) within 5 mm of the VRH/VRL pins.
The S912XEQ384J3VAG's hardware-emulated EEPROM shares the main Flash array, so write cycles to EEPROM-backed variables must use the NXP-supplied EEPROM emulation driver. Bypassing the driver and writing directly to emulated-EEPROM sectors causes premature wear-out. Also ensure the XGATE firmware image is loaded into the XGATE RAM region during initialization, otherwise XGATE-accelerated peripherals default to main-CPU servicing.
On the 144-LQFP layout, route the XOSC1/XOSC2 crystal traces as short, symmetric, ground-guarded traces (length matched within 1 mm) and keep them away from switching power and PWM outputs. Place the crystal load capacitors within 3 mm of the XOSC pins. Incorrect crystal layout is the single most common cause of S12XE-family EMC failures and CAN baud-rate jitter.
Compliance Information
AEC-Q100 qualified per NXP automotive product family. RoHS/REACH compliant per NXP product page. Halogen-free status not explicitly listed in the verified web data.
