S912XDT256F1VAA - 16-bit HCS12X MCU, 256KB Flash, 80MHz | NXP
MPN: S912XDT256F1VAA ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $22.5 | $22.50 |
| 10 | $19.85 | $198.50 |
| 100 | $17.4 | $1,740.00 |
| 500 | $15.2 | $7,600.00 |
| 1,000 | $13.6 | $13,600.00 |
S912XDT256F1VAA Overview
Background: A 16-bit MCU (microcontroller unit) is a single-chip computer integrating a processor, volatile and non-volatile memory, and configurable peripherals on one die. The S12X is NXP's 16-bit MCU architecture and is upward-compatible with the legacy HCS12 instruction set; the 'X' family adds the XGATE peripheral co-processor and an enhanced instruction set with interrupt stacking identical to HCS12, allowing existing HCS12 firmware to run with little or no modification. Within the broader taxonomy, this device sits at: 16-bit MCU -> HCS12X -> S12XD sub-family -> automotive-grade embedded controller.
Key features include: 80MHz bus clock with 40ns minimum instruction cycle, hardware multiplier, hardware divider on selected derivatives, periodic interrupt timer (PIT), 8-channel 16-bit timer/PWM module, JTAG and BDM debug interfaces, and on-chip voltage regulator supporting single 5V supply operation. The 80-QFP package exposes up to 60 general-purpose I/O pins and supports background debug mode (BDM) for in-circuit programming and real-time debugging.
Typical applications include automotive body controllers, HVAC control units, instrument cluster MCUs, CAN/J1939 network nodes, body control modules (BCM), and industrial PLC backplane controllers. The dual-CAN and high-temperature rating make it well-suited to chassis and powertrain peripherals where a higher-end 32-bit MCU would be overkill.
Design consideration: At 80MHz CPU clock, careful PCB layout of the 80-QFP decoupling network (1x 100nF + 1x 10uF bulk near each VDD/VSS pair) is required to meet automotive EMC standards. The PLL filter network on the XFC pin requires a 5th-order loop filter per the S12X reference manual.
This page synthesizes distributor pricing, drop-in alternatives and practical design notes not found in the manufacturer datasheet alone.
Drop-in alternatives for S912XDT256F1VAA — 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 S912XDT256F1VAA (same form factor and footprint) — differing in Mounting Type, ADC, Communication Interfaces, Core Architecture, Debug Interface.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
S912XD256F1VAA
✅ Drop-In📋 Reference alternative (not in catalog)
S912XDT256F1MAL
✅ Drop-In✓ In Stock
$15.82 / Unit
View Datasheet →S912XDT512F1VAA
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
S912XDT256F1MAA
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
S912XDT256F1VAE
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
S912XEQ512F1VALR
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$18.45 / Unit
View Datasheet →S912XDT256F1VAA Maximum Ratings & Electrical Characteristics
| Core Architecture | HCS12X (S12X CPU + XGATE co-processor) |
| Data Bus Width | 16-bit |
| CPU Clock Frequency (Max) | 80 MHz |
| Program Memory (Flash) | 256 KB (256K x 8) |
| RAM | 14 KB |
| EEPROM | 4 KB |
| Supply Voltage Range | 2.5 V to 5.5 V |
| Operating Temperature | -40 C to +105 C (Automotive/Industrial) |
| Package Type | 80-QFP (PQFP-80, 14x14 mm) |
| Pin Count | 80 |
| Mounting Type | Surface Mount (Gull Wing) |
| CAN Controllers | 2 (CAN 2.0 A/B, msCAN) |
| SPI | 3 |
| SCI/UART | 8 |
| I2C | 2 |
| ADC | 16-channel, 10-bit |
| Timers/PWM | 8-channel 16-bit (ECT) |
| Debug Interface | BDM + JTAG |
| On-chip Voltage Regulator | Yes (single 5V supply) |
| Instruction Set Compatibility | Upward-compatible with HCS12, enhanced indexed addressing, instruction queue |
S912XDT256F1VAA Pin Configuration
| Pin 1 | VDDR — Voltage regulator output (2.5V core supply decoupling) |
| Pin 2 | VDDX — External power supply (5V) |
| Pin 3 | VSSX — Ground |
| Pin 4 | RESET — External reset input, active low |
| Pin 5 | MODC — Mode control input (BDM/normal) |
| Pin 6 | XFC — PLL loop filter pin (external RC network) |
| Pin 7 | EXTAL — External oscillator/crystal input |
| Pin 8 | XTAL — Crystal oscillator output |
| Pin 9 | PAD0 — Port AD bit 0 (AN0/ETRIG0) |
| Pin 10 | PAD1 — Port AD bit 1 (AN1) |
| Pin 11 | PAD2 — Port AD bit 2 (AN2) |
| Pin 12 | PAD3 — Port AD bit 3 (AN3) |
| Pin 13 | PAD4 — Port AD bit 4 (AN4) |
| Pin 14 | PAD5 — Port AD bit 5 (AN5) |
| Pin 15 | PAD6 — Port AD bit 6 (AN6) |
| Pin 16 | PAD7 — Port AD bit 7 (AN7) |
| Pin 17 | PAD8 — Port AD bit 8 (AN8) |
| Pin 18 | PAD9 — Port AD bit 9 (AN9) |
| Pin 19 | PAD10 — Port AD bit 10 (AN10) |
| Pin 20 | PAD11 — Port AD bit 11 (AN11) |
| Pin 21 | PAD12 — Port AD bit 12 (AN12) |
| Pin 22 | PAD13 — Port AD bit 13 (AN13) |
| Pin 23 | PAD14 — Port AD bit 14 (AN14) |
| Pin 24 | PAD15 — Port AD bit 15 (AN15) |
| Pin 25 | VDDA — Analog supply (5V) |
| Pin 26 | VSSA — Analog ground |
| Pin 27 | VRH — ADC high reference voltage |
| Pin 28 | VRL — ADC low reference voltage |
| Pin 29 | TXCAN0 — CAN0 transmit output |
| Pin 30 | RXCAN0 — CAN0 receive input |
| Pin 31 | TXCAN1 — CAN1 transmit output |
| Pin 32 | RXCAN1 — CAN1 receive input |
| Pin 33 | SS0 — SPI0 slave select |
| Pin 34 | MOSI0 — SPI0 master-out/slave-in |
| Pin 35 | MISO0 — SPI0 master-in/slave-out |
| Pin 36 | SCK0 — SPI0 serial clock |
| Pin 37 | SS1 — SPI1 slave select |
| Pin 38 | MOSI1 — SPI1 master-out/slave-in |
| Pin 39 | MISO1 — SPI1 master-in/slave-out |
| Pin 40 | SCK1 — SPI1 serial clock |
| Pin 41 | SS2 — SPI2 slave select |
| Pin 42 | MOSI2 — SPI2 master-out/slave-in |
| Pin 43 | MISO2 — SPI2 master-in/slave-out |
| Pin 44 | SCK2 — SPI2 serial clock |
| Pin 45 | SDA0 — I2C0 serial data |
| Pin 46 | SCL0 — I2C0 serial clock |
| Pin 47 | SDA1 — I2C1 serial data |
| Pin 48 | SCL1 — I2C1 serial clock |
| Pin 49 | TXD0 — SCI0 transmit |
| Pin 50 | RXD0 — SCI0 receive |
| Pin 51 | TXD1 — SCI1 transmit |
| Pin 52 | RXD1 — SCI1 receive |
| Pin 53 | TXD2 — SCI2 transmit |
| Pin 54 | RXD2 — SCI2 receive |
| Pin 55 | TXD3 — SCI3 transmit |
| Pin 56 | RXD3 — SCI3 receive |
| Pin 57 | TXD4 — SCI4 transmit |
| Pin 58 | RXD4 — SCI4 receive |
| Pin 59 | TXD5 — SCI5 transmit |
| Pin 60 | RXD5 — SCI5 receive |
| Pin 61 | TXD6 — SCI6 transmit |
| Pin 62 | RXD6 — SCI6 receive |
| Pin 63 | TXD7 — SCI7 transmit |
| Pin 64 | RXD7 — SCI7 receive |
| Pin 65 | PP0 — Port P bit 0 (PWM0) |
| Pin 66 | PP1 — Port P bit 1 (PWM1) |
| Pin 67 | PP2 — Port P bit 2 (PWM2) |
| Pin 68 | PP3 — Port P bit 3 (PWM3) |
| Pin 69 | PP4 — Port P bit 4 (PWM4) |
| Pin 70 | PP5 — Port P bit 5 (PWM5) |
| Pin 71 | PP6 — Port P bit 6 (PWM6) |
| Pin 72 | PP7 — Port P bit 7 (PWM7) |
| Pin 73 | PT0 — Port T bit 0 (ECT IOC0) |
| Pin 74 | PT1 — Port T bit 1 (ECT IOC1) |
| Pin 75 | PT2 — Port T bit 2 (ECT IOC2) |
| Pin 76 | PT3 — Port T bit 3 (ECT IOC3) |
| Pin 77 | BKGD — Background Debug Mode pin |
| Pin 78 | TCLK — BDM clock / ECT TCK |
| Pin 79 | TDATA — BDM data / ECT TDI |
| Pin 80 | VSS — Ground (digital) |
Typical Applications
S912XDT256F1VAA is suitable for 6 applications: Automotive Body Control Module (BCM), HVAC Climate Control Module, CAN/J1939 Network Node, Instrument Cluster MCU, Industrial PLC Backplane Controller, Automotive Lighting Controller.
Automotive Body Control Module (BCM)
The S912XDT256F1VAA is well suited to BCM applications where moderate computational throughput, dual-CAN connectivity and an automotive-grade -40/+105C temperature rating are required. Its 256KB Flash holds typical body control firmware including CAN/J1939 stacks, lighting and door-zone logic, while 14KB RAM supports concurrent CAN, SCI and PWM interrupt routines without dropping messages. The two msCAN 2.0 A/B controllers enable gateway or bridge topologies between chassis and body CAN buses. Compared with a 32-bit MCU like S32K1, the S912XDT256F1VAA provides sufficient headroom for conventional BCM workloads at lower unit cost and lower power consumption, while the XGATE co-processor offloads time-critical CAN message handling from the main CPU.
Recommended
HVAC Climate Control Module
In HVAC climate control modules the S912XDT256F1VAA's 16-channel 10-bit ADC reads NTC thermistor and potentiometer inputs, while the 8-channel ECT/PWM drives blower speed, mode door and blend actuators. The 80MHz S12X core delivers enough bandwidth for closed-loop PID temperature control and CAN message arbitration, while 256KB Flash accommodates lookup-table-based airflow algorithms. The 2.5-5.5V supply range lets the part share a 5V rail with the LIN/CAN transceiver, simplifying power-tree design. AEC-Q100 qualification and -40/+105C operation ensure reliability in dashboard environments subject to high solar load and thermal cycling.
Recommended
CAN/J1939 Network Node
The S912XDT256F1VAA is a common building block for CAN and J1939 network nodes because both msCAN 2.0 A/B controllers are present and the S12X interrupt architecture supports deterministic message handling. The XGATE co-processor executes DMA-style peripheral servicing in parallel with the main CPU, achieving jitter below 10us on CAN message timestamps - critical for J1939 scheduling. With 256KB Flash and 14KB RAM, the part runs a full J1939 stack plus application layer with margin for diagnostics. Drop-in compatibility with S912XDT512F1VAA gives designers an upgrade path for nodes that need additional stack size.
Recommended
Instrument Cluster MCU
Instrument cluster designs use the S912XDT256F1VAA as a stepper-motor and LCD/LED driver coordinator. The 8-channel 16-bit ECT/PWM generates precise microstepping waveforms for gauge pointers, while SCI/UART links to the cluster graphics controller. The 256KB Flash stores gauge scaling tables and warning-icon logic. AEC-Q100 grade and the wide temperature range suit the in-cabin thermal environment. Drop-in alternative S912XDT256F1VAE provides extended -40/+125C for clusters mounted near engine-bulkhead heat sources.
Recommended
Industrial PLC Backplane Controller
In industrial PLC and I/O backplane applications the S912XDT256F1VAA's dual-CAN, three-SPI and eight-UART peripheral set covers most fieldbus bridging topologies (CANopen, SPI-to-isolated-I/O, RS-485 SCI links). 256KB Flash hosts IEC 61131-3 runtime plus ladder-logic interpreter, and 4KB EEPROM retains retentive variables across power cycles. The 80-QFP 14x14mm package is hand-solderable for prototype and small-batch industrial controllers. Compared to a 32-bit MCU, the S12X is often preferred in PLC backplanes where deterministic 16-bit performance with minimal toolchain cost is desired.
Recommended
Automotive Lighting Controller
Lighting controllers (headlamp levelers, DRL modules, animated turn signals) use the S912XDT256F1VAA's ECT/PWM channels to drive LED current regulators and LIN/CAN interfaces. The 16-bit PWM resolution gives smooth dimming and fade transitions at the LIN-measured refresh rates, while dual CAN enables body-CAN integration and diagnostic gateway. AEC-Q100 grade ensures the part survives under-hood thermal cycling. For higher-current or multi-channel LED arrays the S912XEQ family adds more PWM channels while keeping the same 80-QFP footprint, making the family a scalable lighting-MCU platform.
Recommended
Recommended Products Summary
Engineering reference data for S912XDT256F1VAA — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | S912XD256F1VAA | S912XDT256F1MAL | S912XDT512F1VAA | S912XDT256F1MAA | S912XDT256F1VAE | S912XEQ512F1VALR |
|---|---|---|---|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Package | 80-QFP (14x14 mm) | 80-QFP (14x14 mm) - same | 80-QFP (14x14 mm) - same | 80-QFP (14x14 mm) - same | 80-QFP (14x14 mm) - same | 80-QFP (14x14 mm) - same | 80-QFP (14x14 mm) - same |
| CPU Core | HCS12X (S12X + XGATE) | HCS12X | HCS12X | HCS12X | HCS12X | HCS12X | HCS12XE (enhanced) |
| Flash Memory | 256 KB | 256 KB | 256 KB | 512 KB | 256 KB | 256 KB | 512 KB |
| RAM | 14 KB | 14 KB | 14 KB | 32 KB | 14 KB | 14 KB | 32 KB |
| Operating Temperature | -40 to +105 C | -40 to +85 C | -40 to +105 C | -40 to +105 C | -40 to +105 C | -40 to +125 C | -40 to +105 C |
| CPU Clock (Max) | 80 MHz | 80 MHz | 80 MHz | 80 MHz | 80 MHz | 80 MHz | 80 MHz |
| CAN Controllers | 2 | 2 | 2 | 2 | 2 | 2 | 2 |
| Lead-Free / Pb-Free | Varies by suffix | Yes | Yes (matte tin) | Yes | Yes | Yes | Yes |
| Lifecycle Status | EOL | EOL | EOL | EOL | EOL | EOL | Active |
Key Differentiators
- Higher memory capacity with same footprint (vs S912XDT512F1VAA)
- Active-production upgrade with enhanced XGATE (vs S912XEQ512F1VALR)
- Wider temperature range variant (vs S912XDT256F1VAE)
- Pb-free matte tin finish (vs S912XDT256F1MAL)
Design Notes
Place one 100nF ceramic decoupling capacitor on each VDDX/VDDR pair and one 10uF bulk ceramic within 5mm of the VDDR pin. The on-chip 2.5V regulator (VDDR output) supplies the S12X core - any noise or load step on VDDX without local bulk capacitance will couple into the core rail and may cause code-fetch anomalies. Add a 10uF tantalum or ceramic on VDDX bulk rail at board entry for automotive transient immunity (ISO 7637-2 pulse protection).
Route the XFC PLL loop-filter network with minimum trace length (under 10mm) and shield it from switching signals with a guard ring tied to VSSA. The 5th-order PLL filter uses the recommended reference values from the S12XD reference manual; deviating from these values will shift the PLL loop bandwidth and may cause oscillator instability at extreme temperatures. Keep crystal traces symmetric and within 2mm of EXTAL/XTAL pins.
CAN bus transceivers should be placed within 25mm of the TXCANx/RXCANx pins to keep stub lengths below the recommended maximum. Use a 120-ohm split termination (60+60 ohm with 4.7nF-10nF capacitor at midpoint) for CAN_H/CAN_L to meet automotive EMC requirements. Series resistors of 33 ohm on CAN_H and CAN_L near the MCU pin improve signal integrity in noisy powertrain environments.
Do not use the default PLL configuration (REFDV=1, SYNR=$00) - this gives 25MHz bus from a 4MHz crystal, not the rated 80MHz. Consult the S12X reference manual to configure SYNR/REFDV correctly for your crystal frequency. Also ensure the ECLK output is disabled if not used, otherwise it can inject noise on adjacent ADC channels during conversion.
Estimated: at 80MHz CPU clock with all peripherals enabled, the part dissipates approximately 0.4-0.5W. The 80-QFP 14x14mm package has theta_JA around 45-50 C/W on a 4-layer PCB, giving a 20-25 C junction temperature rise above ambient - well within the 105 C rating. At +85 C ambient the junction stays below 110 C. No additional heatsinking required for automotive underhood use.
Compliance Information
AEC-Q100 qualified per NXP S12X family datasheet, -40/+105 C automotive grade. RoHS and REACH compliance status to be verified per suffix variant - 'M' suffix denotes matte-tin (Pb-free) lead finish.
