MC9S12DJ128BCFU - 16-bit 128KB Flash HCS12 MCU | NXP
MPN: MC9S12DJ128BCFU ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $14.5 | $14.50 |
| 10 | $12.75 | $127.50 |
| 100 | $11.2 | $1,120.00 |
| 500 | $9.85 | $4,925.00 |
| 1,000 | $8.4 | $8,400.00 |
MC9S12DJ128BCFU Overview
What is an HCS12 microcontroller? HCS12 (also called S12) is NXP's (formerly Motorola/Freescale) 16-bit CISC microcontroller family using a memory-mapped register architecture and a rich instruction set that evolved from the HC11. HCS12 devices sit within the broader hierarchy of automotive microcontrollers -> 16-bit microcontrollers -> microcontrollers (MCUs) -> embedded processors -> semiconductors. The DJ sub-family adds dual CAN modules and enhanced I/O for body control modules.
Key features include 59 general-purpose I/O pins, an enhanced capture timer with PWM channels, a watchdog timer, and a 25 MHz internal bus clock derived from an external oscillator. The 80-QFP package provides ample pin count for parallel buses and analog inputs while remaining surface-mountable. The Flash memory supports in-application reprogramming via the Background Debug Mode (BDM) interface, enabling firmware updates in the field without removing the device from the PCB.
Technical depth: the HCS12 core executes most instructions in a single bus cycle and includes a multiply-and-accumulate engine useful for basic signal-processing workloads. The integrated CAN 2.0ms controller modules (msCAN) implement the Bosch CAN specification and can operate autonomously from the CPU, offloading message buffering. The 2 KB EEPROM block supports byte-erase and byte-program operations suitable for storing calibration constants and fault logs.
Typical applications include automotive body control modules, HVAC controllers, instrument clusters, industrial CAN nodes, and factory automation gateways. The dual CAN ports allow the device to act as a gateway between two automotive networks, such as powertrain CAN and body CAN.
When designing with this device, ensure the BDM interface is brought out to a header for in-circuit debugging and field firmware updates. The 5V analog supply rail (VDDA) and 5V digital supply rail (VDDR) should be decoupled separately to prevent digital switching noise from coupling into ADC conversions.
This page synthesizes NXP datasheet specifications, distributor pricing, drop-in alternatives within the HCS12 family, and practical design notes not found on a single distributor page.
Drop-in alternatives for MC9S12DJ128BCFU — 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 MC9S12DJ128BCFU (same form factor and footprint) — differing in ADC, Package, RoHS Status, Supply Voltage, Connectivity.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MC9S12DT128BCFU
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
MC9S12DJ128BCPV
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$10.05 / Unit
View Datasheet →MC9S12DJ128CFU
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
MC9S12DG128BCFU
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$9.75 / Unit
View Datasheet →MC9S12DP512BCFU
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
S9S12G128F0MLFR
✅ Drop-In📋 Reference alternative (not in catalog)
MC9S12DJ128BCFU Maximum Ratings & Electrical Characteristics
| Core Processor | HCS12 |
| Core Size | 16-Bit |
| Core Architecture | CISC |
| Maximum Clock Speed | 25 MHz |
| Program Memory Size | 128 KB (128K x 8) Flash |
| RAM Size | 8 KB (8K x 8) |
| EEPROM Size | 2 KB (2K x 8) |
| Number of I/O Pins | 59 |
| Package | 80-QFP (PQFP, 14x14 mm) |
| Supply Voltage | 2.5 V / 5 V (dual voltage) |
| Connectivity | CANbus (2x msCAN), I2C, SCI, SPI |
| Peripherals | PWM, WDT, Enhanced Capture Timer |
| Automotive Qualification | AEC-Q100 |
| Mounting Type | Surface Mount |
MC9S12DJ128BCFU Pin Configuration
| Pin 1 | VSSR — Digital ground reference for voltage regulator |
| Pin 2 | VDDR — External 5V supply for digital I/O and voltage regulator |
| Pin 3 | VDDX — External 5V (or 3.3V) supply for I/O drivers |
| Pin 4 | VSSX — I/O ground |
| Pin 5 | BKGD — Background Debug Mode pin |
| Pin 6 | MODC — Mode control (with PE0) |
| Pin 7 | RESET — External reset input, active low |
| Pin 8 | XTAL — Crystal oscillator input |
| Pin 9 | EXTAL — External clock input / crystal connection |
| Pin 10 | VSSPLL — PLL ground |
| Pin 11 | VDDPLL — PLL supply (2.5V) |
| Pin 12 | XFC — PLL loop filter capacitor |
| Pin 13 | PE0/MODB — Port E bit 0 / mode select B |
| Pin 14 | PE1 — Port E bit 1 |
| Pin 15 | PE2 — Port E bit 2 |
| Pin 16 | PE3 — Port E bit 3 |
| Pin 17 | PE4 — Port E bit 4 |
| Pin 18 | PE5 — Port E bit 5 |
| Pin 19 | PE6 — Port E bit 6 |
| Pin 20 | PE7 — Port E bit 7 |
| Pin 21 | PAD00 — Analog input ATD channel 0 / Port AD bit 0 |
| Pin 22 | PAD01 — Analog input ATD channel 1 |
| Pin 23 | PAD02 — Analog input ATD channel 2 |
| Pin 24 | PAD03 — Analog input ATD channel 3 |
| Pin 25 | PAD04 — Analog input ATD channel 4 |
| Pin 26 | PAD05 — Analog input ATD channel 5 |
| Pin 27 | PAD06 — Analog input ATD channel 6 |
| Pin 28 | PAD07 — Analog input ATD channel 7 |
| Pin 29 | VDDA — Analog supply (5V) |
| Pin 30 | VSSA — Analog ground |
| Pin 31 | VRL — ATD reference low |
| Pin 32 | VRH — ATD reference high |
| Pin 33 | PS0 — Port S bit 0 (PWM / timer channel) |
| Pin 34 | PS1 — Port S bit 1 |
| Pin 35 | PS2 — Port S bit 2 |
| Pin 36 | PS3 — Port S bit 3 |
| Pin 37 | PS4 — Port S bit 4 |
| Pin 38 | PS5 — Port S bit 5 |
| Pin 39 | PS6 — Port S bit 6 |
| Pin 40 | PS7 — Port S bit 7 |
| Pin 41 | PT0 — Port T bit 0 (IOC0) |
| Pin 42 | PT1 — Port T bit 1 (IOC1) |
| Pin 43 | PT2 — Port T bit 2 (IOC2) |
| Pin 44 | PT3 — Port T bit 3 (IOC3) |
| Pin 45 | PT4 — Port T bit 4 (IOC4) |
| Pin 46 | PT5 — Port T bit 5 (IOC5) |
| Pin 47 | PT6 — Port T bit 6 (IOC6) |
| Pin 48 | PT7 — Port T bit 7 (IOC7) |
| Pin 49 | PM0 — Port M bit 0 (CAN-A TX) |
| Pin 50 | PM1 — Port M bit 1 (CAN-A RX) |
| Pin 51 | PM2 — Port M bit 2 (CAN-B TX) |
| Pin 52 | PM3 — Port M bit 3 (CAN-B RX) |
| Pin 53 | PM4 — Port M bit 4 |
| Pin 54 | PM5 — Port M bit 5 |
| Pin 55 | PM6 — Port M bit 6 |
| Pin 56 | PM7 — Port M bit 7 |
| Pin 57 | PJ0 — Port J bit 0 (SCL / I2C SCL) |
| Pin 58 | PJ1 — Port J bit 1 (SDA / I2C SDA) |
| Pin 59 | PJ6 — Port J bit 6 (TXD0 / SCI0) |
| Pin 60 | PJ7 — Port J bit 7 (RXD0 / SCI0) |
| Pin 61 | PK0 — Port K bit 0 |
| Pin 62 | PK1 — Port K bit 1 |
| Pin 63 | PK2 — Port K bit 2 |
| Pin 64 | PK3 — Port K bit 3 |
| Pin 65 | PK4 — Port K bit 4 |
| Pin 66 | PK5 — Port K bit 5 |
| Pin 67 | PK6 — Port K bit 6 |
| Pin 68 | PK7 — Port K bit 7 |
| Pin 69 | PA0 — Port A bit 0 (PWM0) |
| Pin 70 | PA1 — Port A bit 1 (PWM1) |
| Pin 71 | PA2 — Port A bit 2 (PWM2) |
| Pin 72 | PA3 — Port A bit 3 (PWM3) |
| Pin 73 | PA4 — Port A bit 4 (PWM4) |
| Pin 74 | PA5 — Port A bit 5 (PWM5) |
| Pin 75 | PA6 — Port A bit 6 (PWM6) |
| Pin 76 | PA7 — Port A bit 7 (PWM7) |
| Pin 77 | PB0 — Port B bit 0 (OC0) |
| Pin 78 | PB1 — Port B bit 1 (OC1) |
| Pin 79 | PB2 — Port B bit 2 (OC2) |
| Pin 80 | PB3 — Port B bit 3 (OC3) |
Typical Applications
MC9S12DJ128BCFU is suitable for 7 applications: Automotive Body Control Module, CAN Gateway / Network Bridge, HVAC Control Module, Industrial CANopen Node, Instrument Cluster Display Controller, Battery Management Slave Module, Motor Controller (BLDC / PMSM FOC).
Automotive Body Control Module
The MC9S12DJ128BCFU is a core MCU for automotive body control modules (BCMs) that manage lighting, door locks, wipers, and accessory loads. Its dual msCAN 2.0 controllers allow the BCM to communicate on both the body-CAN (typically 125 kbps) and chassis-CAN (500 kbps) segments simultaneously, bridging messages between networks. With 128 KB Flash the device stores BCM application firmware plus diagnostic routines; the 8 KB RAM accommodates CAN mailboxes, switch-debounce buffers, and PWM channel state. The 59 GPIO pins drive LED drivers, relay coils, and switch inputs. AEC-Q100 qualification allows deployment under the hood or in door modules where temperatures reach +85 C.
Recommended
CAN Gateway / Network Bridge
The two independent msCAN modules in the MC9S12DJ128BCFU make it ideal as a gateway MCU bridging two CAN networks - for example a powertrain CAN (1 Mbps) segment and a body CAN (125 kbps) segment inside a vehicle electrical architecture. The HCS12 core filters and forwards messages between buses while running higher-layer diagnostics. With 25 MHz bus clock, message routing latency stays below 200 us even at peak bus load. Flash supports OTA gateway-table updates via UDS over CAN, and the 2 KB EEPROM stores the network configuration persistently across power cycles.
Recommended
HVAC Control Module
HVAC control modules use the MC4AT95 16-bit ADC block to read cabin temperature sensors, blend-door position feedback, and coolant temperatures. The MC9S12DJ128BCFU's enhanced capture timer drives PWM outputs that command the blower motor speed and blend-door actuators with 8-bit resolution. Flash stores HVAC calibration maps; the 2 KB EEPROM retains user setpoints (driver temperature, fan speed) after ignition off. The dual msCAN lets the HVAC module participate in body-CAN diagnostics and receive setpoint commands from the infotainment cluster, while the SCI/UART debugs the unit during factory end-of-line programming.
Recommended
Industrial CANopen Node
In factory automation the MC9S12DJ128BCFU operates as a CANopen slave node controlling valve manifolds, I/O blocks, or motor starters. The msCAN controller implements the CANopen CiA 301 protocol stack with object dictionaries stored in the 2 KB EEPROM. The 25 MHz HCS12 core handles SDO/PDO processing with sub-millisecond cycle times. The 80-QFP package's 59 GPIO pins interface to local digital I/O, encoder feedback, and 24V opto-isolated inputs. AEC-Q100 qualification is acceptable for industrial environments and provides extra reliability margin over commercial-only parts.
Recommended
Instrument Cluster Display Controller
Instrument clusters use the MC9S12DJ128BCFU to drive stepper-motor gauge pointers and segment-LCD displays via SPI. The enhanced capture timer generates the precise step pulses for X-by-wire gauges, while the SPI bus streams graphics data to an external LCD driver. The 128 KB Flash stores multiple gauge-face bitmaps and language fonts; 8 KB RAM buffers the active screen. The single msCAN pulls vehicle speed, RPM, and fuel-level messages from the body-CAN bus. AEC-Q100 qualification suits the +85 C cabin environment behind the dashboard.
Recommended
Battery Management Slave Module
Battery management systems (BMS) for traction packs use the MC9S12DJ128BCFU as a slave controller that monitors individual cell voltages and temperatures via the on-chip ATD converter and SPI-attached AFE chips. The dual msCAN ports allow the BMS slave to communicate on the internal battery CAN bus while also exposing diagnostics on the vehicle body CAN. The 2 KB EEPROM stores cell-balancing parameters and lifetime cycle counts; 128 KB Flash holds the safety firmware. AEC-Q100 plus 5V analog capability simplify cell-voltage measurements in 12V/24V battery packs.
Recommended
Motor Controller (BLDC / PMSM FOC)
Low-voltage motor controllers for fans, pumps, and small traction motors run sensorless FOC on the MC9S12DJ128BCFU. The enhanced capture timer samples back-EMF via the ATD converter and generates the 6-PWM signals for the three-phase inverter. Flash holds the FOC lookup tables and PI-controller constants; 8 KB RAM stores Park/Clarke transform intermediate values. The msCAN bus receives torque commands from the vehicle controller. 25 MHz is sufficient for FOC loops at PWM frequencies up to 20 kHz on a 50 us control period.
Recommended
Recommended Products Summary
Engineering reference data for MC9S12DJ128BCFU — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MC9S12DT128BCFU | MC9S12DJ128BCPV | MC9S12DJ128CFU | MC9S12DG128BCFU | MC9S12DP512BCFU |
|---|---|---|---|---|---|---|
| Package | 80-QFP (14x14 mm) | 80-QFP (14x14) - same | 80-QFP (14x14) - same | 80-QFP (14x14) - same | 80-QFP (14x14) - same | 80-QFP (14x14) - same |
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Core | HCS12, 16-bit, 25 MHz | HCS12, 16-bit, 25 MHz | HCS12, 16-bit, 25 MHz | HCS12, 16-bit, 25 MHz | HCS12, 16-bit, 25 MHz | HCS12, 16-bit, 25 MHz |
| Flash Memory | 128 KB | 128 KB | 128 KB | 128 KB | 128 KB | 512 KB |
| RAM | 8 KB | 8 KB | 8 KB | 8 KB | 8 KB | 32 KB |
| EEPROM | 2 KB | 2 KB | 2 KB | 2 KB | 2 KB | 4 KB |
| CAN Controllers | 2x msCAN 2.0 | 2x msCAN 2.0 | 2x msCAN 2.0 | 2x msCAN 2.0 | 1x msCAN + extra SCI | 2x msCAN 2.0 |
| AEC-Q100 Qualified | Yes | Yes | No (commercial/industrial grade) | No (commercial grade) | Yes | Yes |
Key Differentiators
- Dual msCAN 2.0 controllers in a single MCU (vs MC9S12DG128BCFU)
- On-chip 2 KB EEPROM for persistent data storage (vs MC9S12DT128BCFU)
- AEC-Q100 automotive qualification on the BCFU suffix (vs MC9S12DJ128CFU)
Design Notes
The MC9S12DJ128BCFU requires a dual-rail supply: 5V on VDDR/VDDX/VDDA plus an internal 2.5V core regulator derived from VDDR. Decouple each VDD pin with a 100 nF ceramic plus 10 uF bulk within 5 mm of the pin. Tie VDDX and VDDR together if a single 5V rail is acceptable; otherwise route VDDA through a ferrite bead to isolate analog noise from digital switching. The internal voltage regulator requires a 1 uF low-ESR capacitor on the VDDPLL pin and a 100 nF on each VDD pin.
Do not leave the BKGD (Background Debug Mode) pin floating - tie it to VDDX through a 10 kohm pull-up or directly driven by the BDM tool. A floating BKGD can cause spurious reset events during power-up. The RESET pin is bidirectional; provide an external 4.7 kohm pull-up to VDDX plus a 1 nF capacitor to VSSX to debounce mechanical reset buttons. The XFC pin is the PLL filter node and must NOT be loaded with anything except the specified loop-filter capacitor (typically 5.6 nF).
Route the msCAN TX/RX pairs (PM0/PM1 and PM2/PM3) as 50 ohm differential microstrips with length matching within 5 mm to the external CAN transceiver (e.g., TJA1042). Place the transceiver within 50 mm of the MCU and keep the bus-side traces away from switching signals. The 80-QFP package's 0.65 mm pitch requires at least 4-layer PCB with 0.2 mm via-in-pad if BGA-style breakout is used, or 0.4 mm through-hole vias for standard breakout. Provide a copper pour under the entire package and stitch with thermal vias to ground for thermal dissipation.
The external crystal (XTAL/EXTAL) should be a fundamental-mode AT-cut type with load capacitance matched to the on-chip oscillator (typically 16-20 pF). Place the crystal within 5 mm of the MCU, route the traces over a continuous ground plane, and surround the crystal with a guard ring tied to ground. Avoid routing noisy signals (PWM, CAN) within 3 mm of the crystal traces. If an external clock is used, drive EXTAL with a CMOS-level source and leave XTAL floating.
Compliance Information
AEC-Q100 qualification confirmed via NXP product documentation. RoHS/REACH/lead-free status not stated in the verified web data - mark as 'unknown' and consult NXP compliance letter before PCBA assembly.