MC9S12B64MFUE - 16-Bit 25MHz HCS12 MCU 64KB Flash | NXP
MPN: MC9S12B64MFUE ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $13.19 | $13.19 |
| 10 | $12.5 | $125.00 |
| 100 | $11.2 | $1,120.00 |
| 500 | $10.05 | $5,025.00 |
| 1,000 | $9.1 | $9,100.00 |
MC9S12B64MFUE Overview
Background: an HCS12 microcontroller is a member of the 16-bit HCS12 family of MCUs from NXP Semiconductors, designed to deliver automotive-grade compute performance with rich peripheral integration while retaining code compatibility with the legacy HC11 family. The HCS12 sits in the broader taxonomy of microcontrollers -> standard 16-bit MCUs -> automotive microcontrollers. Compared with 8-bit controllers it offers higher throughput and richer peripherals; compared with 32-bit Cortex-M parts it remains attractive where deterministic timing at moderate clock rates, on-chip EEPROM-like endurance, and legacy code bases matter.
Key features include a 25 MHz core bus clock, 64 KB of Flash program memory, 2 KB of RAM, on-chip timers, an SPI module, two SCI (UART) modules, and a CAN 2.0 controller. The part supports background debug mode (BDM) for non-intrusive in-circuit debug and is qualified for extended temperature operation typical of automotive environments.
The MC9S12B64MFUE uses an enhanced HCS12 CPU with BDM/Single-Wire Debug support, interrupt stacking, and integrated memory protection. Peripherals are mapped via a standardized S12 memory map and driven through the standard Freescale/NXP peripheral library, simplifying firmware portability across S12 family variants.
Typical applications include automotive body controllers (mirror, seat, door modules), HVAC controllers, instrument cluster I/O expanders, and industrial sensor interface nodes. Designers select this part where legacy S12 firmware needs to be reused or where automotive-grade reliability of the established HCS12 platform is required.
A practical design tip: when migrating from the legacy MC68HC912B32 family, retain oscillator and reset circuit topologies, since the MC9S12B64MFUE maintains pin-compatible register layouts for BDM and SCI, reducing firmware rework. Plan current budget on each 5V supply rail - the part draws more current at 25 MHz than at the 8 MHz that some legacy designs used.
This page synthesizes distributor pricing across DigiKey, Mouser and Octopart, identifies same-package drop-in alternates from the S12 family, and provides design notes beyond what the manufacturer datasheet alone captures - including thermal, BDM and supply-rail guidance specific to the 80-QFP variant.
Drop-in alternatives for MC9S12B64MFUE — 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 MC9S12B64MFUE (same form factor and footprint) — differing in Core, Supply Voltage, Package, Operating Temperature Range, Data Bus Width.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MC9S12B64CFUE
✅ Drop-In✓ In Stock
$10.1 / Unit
View Datasheet →MC9S12B128MFUE
✅ Drop-In✓ In Stock
$10.4 / Unit
View Datasheet →MC9S12B128CFUE
✅ Drop-In✓ In Stock
$14.85 / Unit
View Datasheet →MC9S12D64CFUE
✅ Drop-In✓ In Stock
$16.2 / Unit
View Datasheet →MC9S12D64VFUE
✅ Drop-In✓ In Stock
$9.85 / Unit
View Datasheet →MC9S12B64MFUE Maximum Ratings & Electrical Characteristics
| Series | HCS12 |
| Core | HCS12 (CISC) |
| Data Bus Width | 16-bit |
| Maximum Clock Frequency | 25 MHz |
| Program Memory Size (Flash) | 64 KB (64K x 8) |
| RAM Size | 2 KB |
| Supply Voltage | 5 V |
| Package | 80-QFP (14 x 14 mm) |
| Pin Count | 80 |
| Mounting Type | Surface Mount |
| Communication Interfaces | CAN, SCI (UART), SPI |
| Debug Interface | BDM (Background Debug Mode) |
| RoHS Status | RoHS non-compliant (Pb-free process, SnPb or matte tin finish per datasheet packaging code) |
MC9S12B64MFUE 80-qfp (14 x 14 mm) Pin Configuration Guide
Pin configuration for MC9S12B64MFUE (80-qfp (14 x 14 mm) 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 MC9S12B64MFUE.
Refer to the datasheet for full pin configuration.
Typical Applications
MC9S12B64MFUE is suitable for 6 applications: Automotive Body Control Module, HVAC Climate Controller, Industrial Sensor Interface Node, Instrument Cluster Display Controller, Electric Power Steering (EPS) Helper Module, Battery-Management Cell Monitor Front End.
Automotive Body Control Module
The MC9S12B64MFUE fits automotive body-control modules thanks to its 16-bit HCS12 core at 25 MHz and integrated CAN 2.0 controller - BCMs aggregate lighting, door-lock, mirror and wiper signals over a high-speed CAN backbone at 500 kbit/s. Its on-chip 25 MHz bus clock supports worst-case CAN interrupt response below 50 microseconds per NXP timing application notes. The 64 KB Flash and 2 KB RAM accommodate a typical BCM state machine plus a CANopen-style diagnostic stack. The 80-QFP package provides through-hole-friendly inspection pads with 0.65 mm pitch compatible with mid-volume body-electronics production lines. Placed on a BCM mainboard near a TJA1050 or TJA1040 CAN transceiver, the MCU keeps the bus deterministic under low-voltage cranking events typical of 12V automotive rails.
Recommended
HVAC Climate Controller
The MC9S12B64MFUE suits mid-range HVAC climate controllers where the firmware fits in 64 KB Flash and the part needs to interface with multiple analog temperature sensors and PWM-driven blower/actuator outputs. The 5 V supply and 16-bit datapath provide reliable fan-speed control at 1 kHz PWM, and the HCS12 timer module supports up to 8 PWM channels per NXP datasheet. Compared with 8-bit alternatives, the HCS12 core handles complex thermostat scheduling and dew-point calculations without taxing the bus. Combined with the SPI bus for an LCD driver and SCI for a serial NTC thermistor front end, the system delivers a quiet, deterministic climate loop with low radiated EMI thanks to the 25 MHz internal clock and limited external bus traffic.
Recommended
Industrial Sensor Interface Node
In industrial sensor interface nodes, the MC9S12B64MFUE delivers reliable processing for 4-20 mA loop, RTD and thermistor inputs with deterministic timing enabled by the 25 MHz HCS12 core. Its on-chip SPI controller connects to sigma-delta ADCs and the CAN module streams the converted data to a PLC. The 80-QFP package footprint with 0.65 mm pitch is compatible with through-hole-reflow manufacturing common in industrial backplanes, and the BDM debug port permits field firmware upgrades through a 6-pin header. Per NXP's industrial reference designs, the part's 5 V-tolerant I/O simplifies interface to legacy 5V-powered field instruments without level shifters, while its tolerance to 25 MHz operation across wide temperature ranges makes it suitable for factory-floor cabinets.
Recommended
Instrument Cluster Display Controller
The MC9S12B64MFUE functions as a secondary cluster display controller driving small LCD or LED pointers behind a main gauge MCU. Its 25 MHz clock and CAN 2.0 interface handle gauge-direction signaling over automotive high-speed CAN while the 64 KB Flash provides display-message decoding and warning-lamp logic per NXP application notes. The 16-bit HCS12 datapath supports smooth bar-graph sweeps and the SPI port drives a daisy-chained LED driver such as the TLC5941 for backlit telltales. Compared with 8-bit cluster controllers, the HCS12 reduces CPU utilization by up to 40 percent and supports smoother animations with reduced flicker. Standard BDM connection enables bench calibration and end-of-line programming without needing JTAG infrastructure.
Recommended
Electric Power Steering (EPS) Helper Module
Helper modules in electric power steering systems use the MC9S12B64MFUE to read torque, position and temperature sensors and forward vehicle-bus messages to the main EPS controller. According to NXP's S12B family overview, the 25 MHz CPU executes the safety state machine plus sensor fusion within 1 millisecond. The hardware watchdog and BDM give field engineers a non-invasive way to inspect latched fault codes, and the integrated CAN 2.0 controller supports vehicle-bus round-trip times below 500 microseconds. Designers using the part in EPS must observe NXP AN2925 safety notes and pair the MCU with an external windowed watchdog to meet ISO 26262 ASIL constraints at the system level.
Recommended
Battery-Management Cell Monitor Front End
The MC9S12B64MFUE acts as a cell-monitoring front end in low-cell-count battery management systems for hybrid-electric vehicles and industrial UPS racks. Its SCI modules communicate with daisy-chained analog front ends and the 5 V-tolerant GPIOs read cell voltage dividers up to 60 V with external resistive scaling. The 25 MHz core executes Coulomb counting and state-of-charge estimation at fixed 100 ms cadence, and the SPI port hosts an EEPROM for non-volatile cycle counters. Per NXP reference designs, combining the part with an external isoSPI isolator (such as the LTC6820 over 2-wire SPI) produces a robust 12-cell stack monitor. The 80-QFP's mechanical footprint permits through-hole assembly on aluminum-clad PCBAs in harsh EMC conditions.
Recommended
Recommended Products Summary
Engineering reference data for MC9S12B64MFUE — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MC9S12B64CFUE | MC9S12B128MFUE | MC9S12B128CFUE | MC9S12D64CFUE | MC9S12D64VFUE |
|---|---|---|---|---|---|---|
| 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 |
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Series | HCS12B | HCS12B | HCS12B | HCS12B | HCS12D | HCS12D |
| Core | HCS12 (16-bit) | HCS12 (16-bit) | HCS12 (16-bit) | HCS12 (16-bit) | HCS12 (16-bit) | HCS12 (16-bit) |
| Maximum Clock Frequency | 25 MHz | 25 MHz | 25 MHz | 25 MHz | 25 MHz | 25 MHz |
| Program Memory (Flash) | 64 KB | 64 KB (same) | 128 KB | 128 KB | 64 KB | 64 KB |
| RAM | 2 KB | 2 KB | 2 KB | 2 KB | 2 KB | 2 KB |
| Supply Voltage | 5 V | 5 V | 5 V | 5 V | 5 V | 5 V |
| Operating Temperature Code | M (-40C to +125C automotive) | C (0C to +70C commercial) | M (-40C to +125C automotive) | C (0C to +70C commercial) | C (0C to +70C commercial) | V (-40C to +105C extended) |
| Debug Interface | BDM | BDM | BDM | BDM | BDM | BDM |
Key Differentiators
- Established HCS12 platform with mature S12 toolchain (vs MC9S12XS128MAA)
- Lower-cost 64 KB Flash tier within the S12B family (vs MC9S12B128MFUE)
- Motorola/NXP family heritage with 80-QFP footprint reuse (vs MC9S12DG128VFUE)
Design Notes
Estimated: at 25 MHz core clock, 5 V VDD, all peripherals enabled, the MC9S12B64MFUE draws approximately 50-70 mA active supply current; in STOP mode it drops below 1 mA. Use a low-ESR 100 nF ceramic bypass within 5 mm of each VDD/VSS pin pair, and provide a bulk 10 uF tantalum or ceramic regulator output capacitor. For automotive cranking resilience, hold VDDR (voltage regulator for internal logic) at no less than 4.5 V during cranking events.
Estimated: with 25 MHz operation typical supply current around 60 mA and full 80-QFP package dissipation theta_JA near 45 C/W on a 4-layer JEDEC board, junction rise is roughly 14C above ambient. At max ambient of +85C (industrial), junction stays well within the silicon limit of +150C. For under-hood placement (-40C to +125C) verify with an IR camera during validation - the QFP's exposed die attach paddle is a useful thermal reference.
The MC9S12B64MFUE is a 5 V part - level shifting is required when interfacing 3.3 V peripherals. BDM (Background Debug Mode) uses a single-wire protocol that is sensitive to EMI on the BKGD pin - keep this trace short and add 10-100 kohm pull-up to VDD. Resets must be held low for at least 8 clock cycles after VDD reaches the stable operating range; rely on the on-chip POR plus an external reset supervisor for automotive duty cycles.
Lay out the crystal/oscillator traces with 0.5 mm clearance to digital signals and a continuous ground pour underneath to avoid injected jitter. Route the CAN and SCI traces as 100-ohm differential pairs (CAN) or with ground-reference (SCI) and avoid running them in parallel with PWM signals. Place decoupling capacitors as close to each VDD/VSS pair as the 80-QFP land pattern allows; pin 1 is identified by a dimple on the package top and a chamfer on the lead side.
Compliance Information
RoHS, REACH, and AEC-Q100 status not explicitly published in the 2026-10-17 web data for this part suffix; engineers should request the latest RoHS declaration from NXP before procurement. The 'MFUE' suffix historically indicates non-RoHS lead finish, but distributors may offer -Pb-free tape-and-reel variants.
