MC68332ACEH25 - 32-Bit 25MHz MCU CPU32 | NXP | 132-PQFP
MPN: MC68332ACEH25 ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $42.5 | $42.50 |
| 10 | $39.2 | $392.00 |
| 100 | $35.8 | $3,580.00 |
| 500 | $32.1 | $16,050.00 |
| 1,000 | $29.5 | $29,500.00 |
MC68332ACEH25 Overview
A 32-bit modular microcontroller is a class of embedded processor built from independent functional blocks sharing a common intermodule bus (IMB). In the broader hierarchy, the MC68332 belongs to the Motorola-originated M683xx family of 68K-architecture microcontrollers, positioned above 8-bit and 16-bit MCUs in data-manipulation capability and below full application processors in complexity. Standardized modules allowed Motorola, later Freescale and now NXP, to rapidly derive application-tailored derivatives from the same die platform.
Key features include the 32-bit CPU32 core clocked at 25 MHz, ROMless program memory operation requiring external FLASH or RAM, the TPU coprocessor providing 16 independent timing channels for complex event sequencing without CPU intervention, and the QSM combining a queued serial peripheral interface with a serial communications interface on shared pins.
The IMB architecture decouples peripheral timing from CPU execution, so the TPU can generate PWM, capture, and motor-control timing waveforms with microsecond-level determinism while the CPU32 handles application logic. The SIM supplies system clock generation, external bus control, chip-select logic, and watchdog protection. According to the NXP MC68332 technical summary (MC68332TS), the modular design facilitates rapid development of devices tailored for specific applications.
Typical applications include industrial automation controllers, automotive body and powertrain modules, thermal sensor data loggers with external FLASH and RAM, and motor-control systems that exploit the TPU's 16 timing channels.
Designers must budget for external program memory since the part is ROMless, and must recalibrate clock-dependent firmware when substituting 16 MHz variants for 25 MHz parts.
This page synthesizes distributor pricing context, EOL status, drop-in alternative analysis, and practical design notes not found in the manufacturer datasheet.
Drop-in alternatives for MC68332ACEH25 — 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 MC68332ACEH25 (same form factor and footprint) — differing in Core Processor, Intermodule Bus, Lifecycle Status, Maximum Clock Frequency, Peripherals.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MC68332ACEH16
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$40.34 / Unit
View Datasheet →MC68332ACEH20
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
SPAKMC332AVFC16
✅ Drop-In📋 Reference alternative (not in catalog)
MC68332GCFC16
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
MC68332ACEH25 Maximum Ratings & Electrical Characteristics
| Core Processor | CPU32 (32-bit) |
| Core Size | 32-Bit |
| Maximum Clock Frequency | 25 MHz |
| Program Memory Type | ROMless |
| Product Series | M683xx |
| System Integration Module | SIM (included) |
| Time Processing Unit | TPU (included) |
| Queued Serial Module | QSM (included) |
| Intermodule Bus | IMB |
| Package | 132-PQFP (24.13 x 24.13 mm) |
| Mounting Type | Surface Mount |
| Architecture | Modular microcontroller (68K family) |
| Peripherals | TPU, QSM, SIM, watchdog |
| External Memory Support | External FLASH/RAM required (ROMless) |
| Manufacturer | NXP Semiconductors (originally Motorola/Freescale) |
| Lifecycle Status | End-of-Life (per NXP Community, 2026) |
MC68332ACEH25 132-pqfp (24.13 x 24.13 mm) Pin Configuration Guide
Pin configuration for MC68332ACEH25 (132-pqfp (24.13 x 24.13 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 MC68332ACEH25.
Refer to the datasheet for full pin configuration.
Typical Applications
MC68332ACEH25 is suitable for 6 applications: Industrial Automation Controllers, Thermal Sensor Data Acquisition, Automotive Body and Powertrain Modules, Motor Control Systems, Networking and Communication Equipment, Test and Measurement Instrumentation.
Industrial Automation Controllers
The MC68332ACEH25 fits industrial automation controllers where deterministic multi-channel timing and 32-bit data manipulation are both required. Its 25 MHz CPU32 handles protocol parsing and HMI logic while the 16-channel TPU generates PWM and captures encoder or sensor events in hardware, immune to CPU interrupt latency. The SIM's programmable chip selects simplify attaching external FLASH, RAM, and FPGA-based I/O over the 32-bit external bus. Because the part is ROMless, designers pair it with external nonvolatile memory sized to firmware needs. For retrofit and legacy-line maintenance, the MC68332 remains the path of least firmware risk; new controller designs should evaluate modern MCUs with hardware timer arrays.
Recommended
Thermal Sensor Data Acquisition
NXP Community users describe MC68332 systems with external FLASH and RAM collecting data from thermal sensors, a pattern the MC68332ACEH25 serves well. The QSM's QSPI serial peripheral reads multiple temperature sensor channels (for example SPI-output digital sensors) while the CPU32 filters and logs samples to external memory. The TPU can time-stamp readings for trend analysis with hardware precision, and the SIM's watchdog protects long unattended logging sessions. The 132-PQFP footprint keeps the two-chip MCU-plus-memory solution compact. Given the family's EOL status, new logging designs should consider this architecture only where existing MC68332 firmware and toolchains are already validated and production stock is secured.
Recommended
Automotive Body and Powertrain Modules
The MC68332 family was widely used in automotive electronic control units, where the CPU32's mature 68K instruction set and the TPU's 16 timing channels drove injectors, solenoids, and stepper actuators with hardware-level determinism. The ACE temperature grade supports extended ambient conditions typical of underhood and cabin modules. External FLASH plus the SIM's bus monitor and watchdog provided fail-safe behavior demanded by automotive QA. Although the family is now EOL and successors must meet current AEC-Q100 requirements, service organizations maintaining in-flight vehicle platforms still depend on MC68332-based ECUs, making remaining authorized stock valuable for repair and remanufacture rather than new automotive production.
Recommended
Motor Control Systems
The TPU is the MC68332's decisive advantage in motor control: its 16 channels run microcode-based functions for BLDC commutation, stepper sequencing, and PWM generation without CPU loading, allowing the 25 MHz CPU32 to simultaneously run fieldbus protocols and supervisory control. TPU dead-time insertion and period measurement are handled in hardware, delivering deterministic edges that software timers struggle to match. The QSM's QSPI reads current-sense ADCs while the SIM generates the system clock and chip selects for external program memory. Designs preserving validated TPU microcode should stay on MC68332 family parts while stock lasts; new motor-control designs should map TPU functions to modern timer/MCAP peripherals.
Recommended
Networking and Communication Equipment
Legacy industrial networking and telemetry equipment used the MC68332's QSM SCI for RS-232/RS-485 links and the 32-bit external bus for multi-port memory. The QSPI can bit-bang proprietary serial protocols to line cards and modems while the CPU32 runs higher-layer stack firmware from external FLASH. The SIM's programmable chip selects and bus monitor simplify multi-device bus design and recovery from bus faults. The 25 MHz grade (ACEH25) provides headroom for protocol processing versus 16 MHz variants, at the cost of stricter memory timing margins on the external bus. For maintaining installed communication racks, firmware-compatible speed-grade substitutions are possible with clock-dependent recalibration.
Recommended
Test and Measurement Instrumentation
Bench and rack instrumentation built on the CPU32 exploited the TPU's precise time-interval measurement - input capture resolution is set by the TPU counter clock, giving sub-microsecond event timing independent of CPU activity. The MC68332ACEH25's 32-bit core computes calibration math and formats results for displays or the SCI interface, while QSPI scans front-panel ADCs and DACs. External FLASH holds calibration tables that field service can update. The 132-PQFP two-layer-friendly footprint supported dense analog/digital mixed layouts. Instruments already designed around CPU32 firmware and TPU microcode remain most safely maintained on family stock; new instruments should adopt modern MCUs with hardware capture timers and precision analog front-ends.
Recommended
Recommended Products Summary
Engineering reference data for MC68332ACEH25 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MC68332ACEH16 | MC68332ACEH20 | SPAKMC332AVFC16 | MC68332GCFC16 |
|---|---|---|---|---|---|
| Package | 132-PQFP (24.13 x 24.13 mm) | 132-PQFP (24.13 x 24.13 mm) - same | 132-PQFP (24.13 x 24.13 mm) - same | 132-PQFP (24.13 x 24.13 mm) - same | 132-PQFP (24.13 x 24.13 mm) - same |
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Core | CPU32, 32-bit | CPU32, 32-bit | CPU32, 32-bit | CPU32, 32-bit | CPU32, 32-bit |
| Max Clock Frequency | 25 MHz | 16 MHz | 20 MHz | 16 MHz | 16 MHz |
| Program Memory | ROMless (external required) | ROMless (external required) | ROMless (external required) | ROMless (external required) | ROMless (external required) |
| TPU Timing Channels | 16 (TPU) | 16 (TPU) | 16 (TPU) | 16 (TPU) | 16 (TPU) |
| Firmware Compatibility | Baseline (25 MHz) | Runs, clock-dependent code recalibration needed | Runs, clock-dependent code recalibration needed | Runs without issues per NXP; recalibrate clock configs | Runs, clock-dependent code recalibration needed |
| Lifecycle Status | EOL | EOL | EOL | EOL (per NXP Community, 2026) | EOL |
Key Differentiators
- Fastest family speed grade (vs MC68332ACEH16)
- TPU timing coprocessor (vs MC68332ACEH20)
- ROMless flexibility (vs SPAKMC332AVFC16)
Design Notes
The MC68332 family is a 5 V device; verify your supply regulation and decoupling budget across the 132-pin PQFP. Place at least one 0.1 uF ceramic decoupling capacitor per supply pin pair, plus bulk 10 uF near the corner power pins. Because the part drives a 32-bit external bus to ROMless FLASH/RAM, bus switching current peaks with address/data transitions - confirm supply headroom during FLASH erase/write bursts, which draw the largest simultaneous internal and external bus currents.
The single most common MC68332 substitution error is dropping a 16 MHz part (e.g., SPAKMC332AVFC16) onto a 25 MHz design without recalibrating clock-dependent configuration. Per the NXP Community response of March 2026, firmware runs without issues but all system-clock-dependent configurations - SCI baud rates, QSPI baud rates, TPU period registers, timer prescalers, and watchdog timeouts - must be recomputed for the 16 MHz system clock. Build these values from a single clock-frequency constant in firmware to make speed-grade swaps safe.
The 132-PQFP (24.13 x 24.13 mm) has 0.65 mm-pitch leads on four sides; use a grid-array footprint with 0.3 mm wide pads and inspect with magnification or X-ray for solder bridges. Route the external bus with controlled stub length - keep address/data lines under roughly 10 cm and series-terminate long traces to limit ringing at 25 MHz bus rates. The exposed numbering starts at the pin-1 dot at the top-left corner; verify against the datasheet pinout diagram before releasing the footprint.
The entire MC68332 family including SPAKMC332AVFC16 is End-of-Life per NXP (2026). Do not design it into new products. For legacy sustainment, secure last-time-buy stock now, qualify authorized excess brokers with date-code and provenance screening, and begin a redesign roadmap that maps TPU timing functions to modern MCU hardware timer arrays. Counterfeit risk on EOL 68K parts is high; prefer distributors with documented chain of custody.
Compliance Information
The MC68332 is a legacy EOL part predating modern environmental compliance documentation; compliance status not stated in the provided verified data.
