S912XEG384J3CAGR - 384KB Flash S12X MCU, 50MHz, LQFP-144 | NXP
MPN: S912XEG384J3CAGR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $18.5 | $18.50 |
| 10 | $16.85 | $168.50 |
| 100 | $14.95 | $1,495.00 |
| 500 | $13.2 | $6,600.00 |
| 1,000 | $11.65 | $11,650.00 |
S912XEG384J3CAGR Overview
What is an HCS12X microcontroller? The HCS12X is NXP's 16-bit automotive MCU family that extends the legacy HCS12 architecture with a co-processor (XGATE) for interrupt-driven peripheral offload, allowing deterministic, low-latency I/O handling. In the broader taxonomy it sits as a 16-bit microcontroller -> automotive microcontroller -> embedded processor -> semiconductor IC. HCS12X parts target body, chassis, and powertrain ECUs where deterministic real-time behaviour, on-chip CAN, and AEC-Q100 stress tolerance are required.
Key features of the S912XEG384J3CAGR include 384KB of Flash program memory, 50MHz CPU/bus clock, integrated SPI, watchdog timer, internal oscillator, and 144 GPIO-capable pins in an LQFP-144 package. The 144-pin LFQFP (Low-Frequently-eed QFP) provides sufficient I/O for multi-channel peripheral interface enabled simultaneously. The "G" suffix confirms Pb-free, lead-free, RoHS-compliant assembly.
Architecturally, the S12X core pairs a 16-bit CPU with the XGATE peripheral co-processor that handles high-throughput interrupt-driven tasks (CAN/LIN/SPI/PWM servicing) without CPU intervention, enabling deterministic response at high bus frequencies. The 384KB Flash bank supports in-application programming and EEPROM emulation for automotive calibration data storage.
Typical applications for the S912XEG384J3CAGR include automotive body controllers, instrument cluster MCUs, HVAC control, immobilizer interfaces, industrial CAN nodes, and general-purpose 16-bit embedded control with deterministic XGATE peripheral offload. The wide LQFP-144 pin count supports multi-bus bridging designs.
When designing with this part, plan the XGATE interrupt vector table alongside the CPU vector table and reserve the watchdog timer for fail-safe recovery. The 1.8V core supply rail requires a low-noise source, a 3.3V I/O rail, and careful decoupling per NXP's hardware design guidelines for HCS12X.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
Drop-in alternatives for S912XEG384J3CAGR — 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 S912XEG384J3CAGR (same form factor and footprint) — differing in Package, Core, Operating Temperature, Flash Memory, ADC.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
S912XEQ384J3CAG
✅ Drop-In📋 Reference alternative (not in catalog)
S912XET512BMAGR
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$6.6 / Unit
View Datasheet →S912XEG384J2VAL
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$17.8 / Unit
View Datasheet →MC9S12XEQ384CAG
✅ Drop-In✓ In Stock
Contact for price
View Datasheet →S9S12XF384J2MLMR
✅ Drop-In✓ In Stock
Contact for price
View Datasheet →MC9S12XEP768CAG
✅ Drop-In✓ In Stock
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View Datasheet →S912XEG384J3CAGR Maximum Ratings & Electrical Characteristics
| Manufacturer | NXP Semiconductors / Freescale |
| Product Type | 16-bit Microcontroller (MCU) |
| Core | S12X (HCS12X with XGATE co-processor) |
| Program Memory (Flash) | 384 KB |
| Maximum CPU/Bus Frequency | 50 MHz |
| Supply Voltage | 1.8 V |
| Operating Temperature Range | -40 C to +85 C |
| Temperature Grade | Industrial |
| Package | LQFP-144 (LFQFP), 144 gull-wing terminals |
| Mounting Type | Surface Mount |
| Terminal Form | GULL WING |
| Package Code / Shape | LFQFP / SQUARE |
| Integrated Peripherals | SPI, Watchdog Timer, Oscillator subsystem |
| Lead-Free / RoHS | Yes (G suffix indicates Pb-free) |
| Automotive Qualified | AEC-Q100 qualified |
S912XEG384J3CAGR lfqfp / square Pin Configuration Guide
Pin configuration for S912XEG384J3CAGR (lfqfp / square 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 S912XEG384J3CAGR.
Refer to the datasheet for full pin configuration.
Typical Applications
S912XEG384J3CAGR is suitable for 6 applications: Automotive Body Control Module, Instrument Cluster MCU, HVAC Control Module, Immobilizer Interface, Industrial CAN Node Controller, General-Purpose 16-bit Embedded Controller.
Automotive Body Control Module
The S912XEG384J3CAGR's 384KB Flash and 50MHz S12X core make it ideal for body control modules (BCMs) that orchestrate central locking, exterior lighting, wiper control, and CAN-mirror communication with the gateway. The XGATE co-processor offloads high-frequency CAN/LIN interrupt servicing, enabling deterministic response times for body-network messages. With 144 GPIO pins, the part supports multiple SPI buses for lighting drivers, ADC channels for switch reading, and PWM channels for motor control - in a single LQFP-144 footprint.
Recommended
Instrument Cluster MCU
Instrument clusters require a deterministic real-time MCU to drive stepper motors for gauges, multiplex multiple SPI displays, and service CAN traffic from the vehicle bus. The S912XEG384J3CAGR's 384KB Flash provides sufficient code room for gauge algorithms, diagnostic routines, and CAN message libraries, while the 50MHz bus delivers the throughput needed to refresh gauges at 100Hz without jitter. The XGATE offloads PWM generation for stepper motor control, freeing main CPU cycles for application logic in this automotive cluster design.
Recommended
HVAC Control Module
HVAC modules demand precise PWM control of blower motors, temperature sensor ADC sampling, and CAN/LIN communication with the body controller. The S912XEG384J3CAGR's LQFP-144 package exposes enough GPIO for multi-zone temperature sensing, while the S12X core with XGATE offload handles PWM updates with deterministic latency. The 384KB Flash accommodates lookup tables for fan curves, blend-door algorithms, and diagnostic handlers, all within an AEC-Q100 qualified industrial-grade silicon suitable for cabin-mounted automotive HVAC modules.
Recommended
Immobilizer Interface
The S912XEG384J3CAGR's 384KB Flash, deterministic XGATE interrupt handling, and SPI peripheral make it well-suited for immobilizer interface modules that communicate with LF/HF transponders via SPI-driven reader ICs. The 144-pin LQFP supports multiple SPI instances for separate antennas and a CAN interface for body-network reporting. AEC-Q100 qualification plus industrial temperature grading allow cabin or steering-column placement, while NXP's HCS12X security ecosystem supports cryptographic authentication of transponder challenges.
Recommended
Industrial CAN Node Controller
Outside the automotive cabin, the S912XEG384J3CAGR serves as a robust industrial CAN node controller for PLCs, motor controllers, and sensor hubs requiring deterministic real-time response. The 50MHz S12X core plus XGATE handles multi-channel CAN traffic with sub-millisecond latency, while the 144-pin LQFP provides GPIO for sensor I/O, digital inputs, and relay drivers. The -40C to +85C industrial temperature grade suits factory floor installations, and 384KB Flash accommodates CANopen or DeviceNet protocol stacks plus application firmware.
Recommended
General-Purpose 16-bit Embedded Controller
Beyond automotive, the S912XEG384J3CAGR functions as a general-purpose 16-bit embedded controller for robotics, building automation, and test equipment. The 384KB Flash stores RTOS kernels (WRIGHT-MicroC/OS, FreeRTOS S12X port) plus application logic, while the 50MHz bus delivers deterministic multi-tasking throughput. The 144-pin LQFP supports a rich peripheral mix (SPI, SCI, timers, ADC, PWM) enabling multi-sensor data acquisition, motor control, and human-machine interface (HMI) keypad scanning in a single chip.
Recommended
Recommended Products Summary
Engineering reference data for S912XEG384J3CAGR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | S912XEQ384J3CAG | S912XET512BMAGR | S912XEG384J2VAL | MC9S12XEQ384CAG | S9S12XF384J2MLMR | MC9S12XEP768CAG |
|---|---|---|---|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Package | LQFP-144 (LFQFP) | LQFP-144 - same | LQFP-144 - same | LQFP-144 - same | LQFP-144 - same | LQFP-144 - same | LQFP-144 - same |
| Program Flash | 384 KB | 384 KB | 512 KB | 384 KB | 384 KB | 384 KB | 768 KB |
| Maximum Bus Frequency | 50 MHz | 50 MHz | 50 MHz | 50 MHz | 50 MHz | 50 MHz | 50 MHz |
| Temperature Grade | Industrial -40/+85 C | Industrial -40/+85 C | Industrial -40/+85 C | Extended -40/+105 C | Industrial -40/+85 C | Industrial -40/+85 C | Industrial -40/+85 C |
| Core Family | S12X with XGATE | S12X with XGATE | S12X with XGATE | S12X with XGATE | S12X with XGATE | S12X with XGATE | S12X with XGATE |
| AEC-Q100 Qualified | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Supply Voltage | 1.8 V core | 1.8 V core | 1.8 V core | 1.8 V core | 1.8 V core | 1.8 V core | 1.8 V core |
| Approx. Unit Price (1 pc) | $18.50 | $17.50 | $22.00 | $20.00 | $17.00 | $24.00 | $26.50 |
Key Differentiators
- Highest-density Flash in S12XEG family at LQFP-144 (vs S912XEG256J2CAL)
- Lower unit price than 768KB variant (vs MC9S12XEP768CAG)
- Industrial-grade vs extended-temperature alternative (vs S912XEG384J2VAL)
- Standard family naming vs legacy MC9S12 prefix (vs MC9S12XEQ384CAG)
Design Notes
The S912XEG384J3CAGR requires a low-noise 1.8V core supply and a separate 3.3V I/O supply (typical S12X architecture). Place 100nF ceramic decoupling capacitors as close as possible to every VDD/VSS pair on the LQFP-144 package; add a bulk 10uF tantalum or ceramic capacitor near the regulator output. The MCU's in-application programming (IAP) and EEPROM-emulation operations draw transient current spikes during Flash writes - ensure the regulator has 150mA headroom above the steady-state IDD.
Follow NXP's AN2400 hardware design guidelines for HCS12X layout. Place the external crystal/oscillator within 5mm of the XTAL pins with a guarded ground plane to minimize jitter. Route SPI and CAN traces as differential pairs with 100ohm characteristic impedance; keep high-speed signal traces away from the crystal area. Maintain continuous ground planes under the LQFP-144 thermal pad for thermal dissipation and EMI suppression.
Do not enable XGATE interrupts before configuring the XGATE vector table and the XGVBR/ROVER registers; an uninitialized XGATE will fetch garbage vectors and crash the CPU. The watchdog timer must be serviced (or disabled for debug) during development to prevent unintended resets. When migrating from S12XEG256 to S912XEG384, verify Flash bank remapping since the higher-density variant uses a different memory map. Always issue a stop-mode idle at least once after Flash programming to allow EEPROM emulation to commit.
The S912XEG384J3CAGR's 50MHz bus drives fast edge rates that couple noise into adjacent traces. For SPI buses running above 10MHz, place 22-33ohm series damping resistors near the MCU pins to reduce ringing. CAN bus termination with 120ohm resistors at each end of the bus is mandatory per ISO 11898. For multi-channel ADC sampling, use separate analog and digital ground planes joined at a single point near the MCU's VSS pin.
Compliance Information
G suffix confirms Pb-free, lead-free assembly. AEC-Q100 qualified for automotive applications. Halogen-free status not explicitly stated in web data - flagged for confirmation.
