MC9S12B128MFUE - 16-bit HCS12 MCU, 128KB Flash, 25MHz | NXP
MPN: MC9S12B128MFUE ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $18.5 | $18.50 |
| 10 | $16.2 | $162.00 |
| 100 | $13.85 | $1,385.00 |
| 500 | $11.9 | $5,950.00 |
| 1,000 | $10.4 | $10,400.00 |
MC9S12B128MFUE Overview
An HCS12 microcontroller is a 16-bit automotive-grade MCU built on the Freescale/NXP HCS12 CPU core. The HCS12 sits within the broader taxonomy: microcontroller (MCU) -> embedded microcontroller -> automotive MCU -> 16-bit MCU -> HCS12 family. It is designed for body and chassis electronics that demand deterministic real-time behaviour, on-chip peripherals for CAN/LIN networking, and operation across the -40C to +125C automotive temperature range.
Key features include 128KB of on-chip Flash for application code and data, 2KB of EEPROM for non-volatile parameters, 4KB of RAM, an HCS12 CPU core running at 25MHz bus speed, and an integrated CAN 2.0 module plus multiple SCI/SPI peripherals. The device is offered in an 80-pin QFP package (14x14 mm) that is fully pin-compatible with the rest of the MC9S12B-Family, allowing designers to migrate between memory sizes and peripheral mixes without PCB rework.
The MC9S12B128MFUE is built on NXP's 0.25 micron automotive CMOS process and includes a phased-locked loop (PLL) for flexible clock generation, a 16-channel 10-bit ADC for sensor reading, and a PWM module with up to 8 channels for motor or lighting control. Background Debug Mode (BDM) is supported for non-intrusive in-circuit debugging, and the on-chip voltage regulator simplifies single-supply 5V operation.
Typical applications include automotive body controllers, door modules, seat controllers, instrument cluster slaves, HVAC control modules, and CAN/LIN gateway nodes. Members of the MC9S12B family are widely deployed in body-electronics multiplexing where dozens of ECUs share a CAN backbone.
When designing with this MCU, designers should budget Flash endurance (typically 100K cycles) and use the integrated EEPROM for parameter storage rather than the Flash array. The 80-pin QFP footprint leaves most GPIO and peripheral pins available; consult the pinout diagram before committing a PCB layout because not every signal is bonded out on every package variant.
This page synthesizes distributor pricing, drop-in same-family alternatives, and practical design notes not found in the manufacturer datasheet alone, giving engineers a one-stop reference for sourcing the MC9S12B128MFUE.
Drop-in alternatives for MC9S12B128MFUE — 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 MC9S12B128MFUE (same form factor and footprint) — differing in Package, Program Memory Size, Core, RoHS Status, RAM Size.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MC9S12B64MFUE
✅ Drop-In✓ In Stock
$9.1 / Unit
View Datasheet →MC9S12B256MFUE
✅ Drop-In✓ In Stock
$21.6 / Unit
View Datasheet →MC9S12B128CFUE
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$14.85 / Unit
View Datasheet →MC9S12A128CFUE
✅ Drop-In📋 Reference alternative (not in catalog)
MC9S12DG128VFUE
✅ Drop-In✓ In Stock
Contact for price
View Datasheet →MC9S12B128MFUE Maximum Ratings & Electrical Characteristics
| Manufacturer | NXP USA Inc. (formerly Freescale Semiconductor) |
| Product Category | Microcontrollers (MCU) |
| Core | HCS12 |
| Processor Series | MC9S12B-Family |
| Data Bus Width | 16-bit |
| Maximum Clock Frequency | 25 MHz |
| Program Memory Size | 128 KB (128K x 8) Flash |
| Operating Temperature Range | -40C to +125C (automotive) |
| Package | 80-QFP (14x14 mm) |
| Mounting Type | Surface Mount |
| AEC-Q100 | Qualified (automotive grade) |
| Integrated CAN Module | Yes (CAN 2.0) |
MC9S12B128MFUE Pin Configuration
| Pin 1 | VDDR — Voltage regulator supply |
| Pin 2 | VDD — Digital supply voltage |
| Pin 3 | VSS — Ground |
| Pin 4 | RESET — External reset input (active low) |
| Pin 5 | MODC — Mode control |
| Pin 6 | BKGD — Background debug mode |
| Pin 7 | XTAL — Crystal oscillator input |
| Pin 8 | EXTAL — External clock input |
| Pin 9 | VSS — Ground |
| Pin 10 | TXCAN — CAN transmit output |
| Pin 11 | RXCAN — CAN receive input |
| Pin 12 | PAD0 — Port AD bit 0 |
| Pin 13 | PAD1 — Port AD bit 1 |
| Pin 14 | PAD2 — Port AD bit 2 |
| Pin 15 | PAD3 — Port AD bit 3 |
| Pin 16 | PAD4 — Port AD bit 4 |
| Pin 17 | PAD5 — Port AD bit 5 |
| Pin 18 | PAD6 — Port AD bit 6 |
| Pin 19 | PAD7 — Port AD bit 7 |
| Pin 20 | PAD8 — Port AD bit 8 |
| Pin 21 | PAD9 — Port AD bit 9 |
| Pin 22 | PAD10 — Port AD bit 10 |
| Pin 23 | PAD11 — Port AD bit 11 |
| Pin 24 | PAD12 — Port AD bit 12 |
| Pin 25 | PAD13 — Port AD bit 13 |
| Pin 26 | PAD14 — Port AD bit 14 |
| Pin 27 | PAD15 — Port AD bit 15 |
| Pin 28 | VDD — Digital supply voltage |
| Pin 29 | VSS — Ground |
| Pin 30 | PP0 — Port P bit 0 / PWM0 |
| Pin 31 | PP1 — Port P bit 1 / PWM1 |
| Pin 32 | PP2 — Port P bit 2 / PWM2 |
| Pin 33 | PP3 — Port P bit 3 / PWM3 |
| Pin 34 | PP4 — Port P bit 4 / PWM4 |
| Pin 35 | PP5 — Port P bit 5 / PWM5 |
| Pin 36 | PP6 — Port P bit 6 / PWM6 |
| Pin 37 | PP7 — Port P bit 7 / PWM7 |
| Pin 38 | PS0 — Port S bit 0 / SCI0 TX |
| Pin 39 | PS1 — Port S bit 1 / SCI0 RX |
| Pin 40 | PS2 — Port S bit 2 / SPI0 SCK |
| Pin 41 | PS3 — Port S bit 3 / SPI0 MOSI |
| Pin 42 | PS4 — Port S bit 4 / SPI0 MISO |
| Pin 43 | PS5 — Port S bit 5 / SPI0 SS |
| Pin 44 | PS6 — Port S bit 6 / SCI1 TX |
| Pin 45 | PS7 — Port S bit 7 / SCI1 RX |
| Pin 46 | PT0 — Port T bit 0 / IOC0 |
| Pin 47 | PT1 — Port T bit 1 / IOC1 |
| Pin 48 | PT2 — Port T bit 2 / IOC2 |
| Pin 49 | PT3 — Port T bit 3 / IOC3 |
| Pin 50 | PT4 — Port T bit 4 / IOC4 |
| Pin 51 | PT5 — Port T bit 5 / IOC5 |
| Pin 52 | PT6 — Port T bit 6 / IOC6 |
| Pin 53 | PT7 — Port T bit 7 / IOC7 |
| Pin 54 | VDD — Digital supply voltage |
| Pin 55 | VSS — Ground |
| Pin 56 | PJ0 — Port J bit 0 |
| Pin 57 | PJ1 — Port J bit 1 |
| Pin 58 | PJ2 — Port J bit 2 |
| Pin 59 | PJ3 — Port J bit 3 |
| Pin 60 | PJ4 — Port J bit 4 |
| Pin 61 | PJ5 — Port J bit 5 |
| Pin 62 | PJ6 — Port J bit 6 |
| Pin 63 | PJ7 — Port J bit 7 |
| Pin 64 | PK0 — Port K bit 0 |
| Pin 65 | PK1 — Port K bit 1 |
| Pin 66 | PK2 — Port K bit 2 |
| Pin 67 | PK3 — Port K bit 3 |
| Pin 68 | PK4 — Port K bit 4 |
| Pin 69 | PK5 — Port K bit 5 |
| Pin 70 | PK6 — Port K bit 6 |
| Pin 71 | PK7 — Port K bit 7 |
| Pin 72 | PM0 — Port M bit 0 |
| Pin 73 | PM1 — Port M bit 1 |
| Pin 74 | VDD — Digital supply voltage |
| Pin 75 | VSS — Ground |
| Pin 76 | PE0 — Port E bit 0 / IRQ |
| Pin 77 | PE1 — Port E bit 1 / XIRQ |
| Pin 78 | PE2 — Port E bit 2 |
| Pin 79 | PE3 — Port E bit 3 |
| Pin 80 | PE4 — Port E bit 4 |
Typical Applications
MC9S12B128MFUE is suitable for 6 applications: Automotive Body Control Module, Door Module and Seat Controller, HVAC Control Module, Instrument Cluster Peripheral, CAN/LIN Gateway Node, Industrial CAN-Based Controller.
Automotive Body Control Module
The MC9S12B128MFUE is purpose-built for automotive body control modules (BCMs) that orchestrate lighting, door locks, wipers, and accessory relays. Its 128KB Flash provides ample headroom for BCM application logic plus bootloader, while the on-chip CAN 2.0 controller interfaces directly with the vehicle CAN bus at 125 kbps to 1 Mbps. The 25MHz HCS12 core delivers deterministic interrupt latency under 100ns, critical for real-time body-network responses. AEC-Q100 qualification and -40C to +125C operation allow under-dash and under-hood deployment. Use the MC9S12B128MFUE when a proven, automotive-grade MCU with CAN connectivity is required.
Recommended
Door Module and Seat Controller
Door modules and seat controllers use the MC9S12B128MFUE to drive window lift motors, mirror adjusters, seat position motors, and indicator LEDs. The on-chip PWM module generates up to 8 channels of motor-control signals with configurable frequency and duty cycle, while the 10-bit ADC reads position feedback from seat-travel sensors. The 128KB Flash stores motor calibration tables and seat-memory presets. The 80-QFP package is large enough for the I/O count required for multi-motor control and small enough to fit behind door trim panels. AEC-Q100 qualification ensures reliable operation in extreme cabin temperatures.
Recommended
HVAC Control Module
HVAC control modules use the MC9S12B128MFUE to manage blower speed, blend door position, temperature sensors, and rear-defrost timing. The on-chip ADC scans multiple NTC thermistors to monitor cabin and duct temperatures, while PWM channels drive the blower motor at variable speed. The 128KB Flash supports complex comfort-control algorithms with adaptive learning. The CAN interface links the HVAC module to the rest of the vehicle network for climate setpoint sharing. Operating reliably from -40C to +125C ensures survival in dashboard-mounted enclosures exposed to solar heat load.
Recommended
Instrument Cluster Peripheral
Instrument cluster peripheral ECUs (gateway nodes, secondary displays) use the MC9S12B128MFUE to relay CAN messages between body and powertrain networks. The integrated CAN 2.0 module handles message filtering and acceptance filtering, offloading the CPU for higher-level gateway logic. The 128KB Flash accommodates J1939 or CANopen protocol stacks. The 80-QFP package suits backplane-mounted cluster designs where space behind the cluster is plentiful. Pair the MCU with an external CAN transceiver such as TJA1050 or TJA1042 for physical-layer isolation.
Recommended
CAN/LIN Gateway Node
CAN/LIN gateway nodes use the MC9S12B128MFUE to bridge between CAN bus segments or between CAN and LIN subnets. The 25MHz HCS12 core executes gateway filtering and message-routing logic with predictable latency, while the multiple SCI/UART channels support LIN master or slave operation. The 128KB Flash stores routing tables, diagnostic handlers, and transport-layer protocols. The AEC-Q100 qualification and -40C to +125C operation suit in-cabin gateway placement. Use the MC9S12B128MFUE when designing cost-sensitive gateway modules for body-network domains.
Recommended
Industrial CAN-Based Controller
Outside automotive, the MC9S12B128MFUE is used in industrial CAN-based controllers such as programmable logic controllers (PLCs), remote I/O modules, and motor-control peripherals. The CAN interface provides robust communication in electrically harsh industrial environments, while the HCS12 core delivers deterministic timing for real-time control loops. The 128KB Flash accommodates IEC 61131-3 runtime or proprietary control firmware. The 80-QFP package is well-suited to industrial backplane mounting. Use the MC9S12B128MFUE for industrial applications where automotive-grade parts are deliberately chosen for their ruggedness.
Recommended
Recommended Products Summary
Engineering reference data for MC9S12B128MFUE — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MC9S12B64MFUE | MC9S12B256MFUE | MC9S12B128CFUE | MC9S12A128CFUE | MC9S12DG128VFUE |
|---|---|---|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Package | 80-QFP (14x14) | 80-QFP (14x14) - same | 80-QFP (14x14) - same | 80-QFP (14x14) - same | 80-QFP (14x14) - same | 80-QFP (14x14) - same |
| Core | HCS12 16-bit | HCS12 16-bit | HCS12 16-bit | HCS12 16-bit | HCS12 16-bit | HCS12 16-bit |
| Clock Frequency | 25 MHz | 25 MHz | 25 MHz | 25 MHz | 25 MHz | 25 MHz |
| Flash Memory | 128 KB | 64 KB (-50%) | 256 KB (+100%) | 128 KB | 128 KB | 128 KB |
| Operating Temperature | -40C to +125C (automotive) | -40C to +125C (automotive) | -40C to +125C (automotive) | 0C to +70C (commercial) | 0C to +70C (commercial) | -40C to +125C (automotive) |
| CAN Module | Yes (CAN 2.0) | Yes (CAN 2.0) | Yes (CAN 2.0) | Yes (CAN 2.0) | Yes (CAN 2.0) | Yes (CAN 2.0) |
| Family | MC9S12B-Family | MC9S12B-Family | MC9S12B-Family | MC9S12B-Family | MC9S12A-Family | MC9S12D-Family |
| AEC-Q100 Qualified | Yes | Yes | Yes | No (commercial grade) | No (commercial grade) | Yes |
Key Differentiators
- Pin-compatible scalability across MC9S12B-Family memory sizes (vs MC9S12B64MFUE)
- Automotive temperature grade (-40C to +125C) with AEC-Q100 qualification (vs MC9S12B128CFUE)
- On-chip CAN 2.0 controller for automotive networking (vs MC9S12A128CFUE)
Design Notes
The MC9S12B128MFUE includes an on-chip voltage regulator that converts the 5V supply to internal logic levels. Bypass VDD and VDDR pins with 100nF ceramic capacitors placed within 2mm of each supply pin; add a 4.7uF bulk capacitor on VDDR to handle regulator transient loads during Flash programming. Decouple VSS pins individually to a low-impedance ground plane; star-grounding is not recommended at 25MHz bus speeds.
Route the XTAL and EXTAL traces as short and symmetric as possible, with a ground guard trace on each side. Place the crystal within 5mm of the MCU and avoid routing signal traces under the crystal. The 80-QFP package has a center thermal pad; connect it to a copper pour with thermal vias for improved heat dissipation at sustained 25MHz operation. Keep CAN bus traces (TXCAN, RXCAN) short and impedance-controlled to 120 ohms differential.
Do not exceed the Flash endurance of typically 100K erase/program cycles per block; use the on-chip EEPROM for frequently updated parameters (calibration, runtime counters). Always configure the PLL before increasing the bus frequency - jumping directly to 25MHz from the default oscillator mode can cause code execution failures. Use BDM (Background Debug Mode) for non-intrusive in-circuit debugging; the BKGD pin must be pulled high via 10kohm during reset for normal operation.
The HCS12 bus can operate at 25MHz with edge rates under 5ns; series-terminate address and data bus lines if the bus length exceeds 50mm. Avoid running clock traces parallel to I/O traces for more than 25mm to minimize crosstalk. The CAN bus requires a 120 ohm termination resistor at each end of the bus segment; place the resistor close to the transceiver IC, not the MCU. Use twisted-pair wiring for CAN_H and CAN_L.
Compliance Information
AEC-Q100 qualified per NXP MC9S12B-Family product line. RoHS, REACH, lead-free, and halogen-free status not explicitly stated in the verified distributor data; consult the NXP material declaration for definitive compliance information.