MC908GR32ACFJE - 8-Bit HC08 MCU 32KB FLASH 32-LQFP | NXP
MPN: MC908GR32ACFJE ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $18.5 | $18.50 |
| 10 | $16.2 | $162.00 |
| 100 | $13.85 | $1,385.00 |
| 500 | $11.4 | $5,700.00 |
| 1,000 | $9.75 | $9,750.00 |
MC908GR32ACFJE Overview
An 8-bit microcontroller (MCU) is a single-chip processor integrating a CPU core, program memory (FLASH/ROM), data memory (RAM), peripherals (timers, ADC, communication interfaces), and general-purpose I/O onto one silicon die. MCUs sit at the lowest tier of the embedded computing hierarchy - below microprocessors and microcomputers - and are designed for deterministic, real-time control tasks such as sensor reading, actuator driving, and human-machine interface handling. The HC08 family is NXP/Freescale's M68HC05 successor line, executed in FLASH, with object code upward compatibility to M6805, M14805, and M68HC05 families.
Key features of the MC908GR32ACFJE include FLASH-based in-application programmability, low-voltage operating modes, on-chip oscillator, system protection features (LVI / COP watchdog depending on family variant), and 21 bidirectional I/O pins. The device is specified for the industrial operating temperature range of -40C to +85C and ships in trays for prototype and low-volume production.
Technically, the MC908GR32ACFJE implements the M68HC08 CPU with a 16-bit internal index register and 8-bit accumulator, supporting a variety of addressing modes for C-friendly code generation. The integrated oscillator, programmable timer, and FLASH memory block are accessible through a unified memory map, simplifying firmware development compared with ROM-based legacy parts.
Typical applications for the MC908GR32ACFJE include industrial control and sensor interfacing, low-cost consumer appliances, automotive body electronics (non-safety), and general-purpose embedded control. The 32KB FLASH and 1.5KB RAM combination suits compact state machines, small protocol stacks, and simple user-interface loops where deterministic 8-bit performance is sufficient.
When designing with this part, plan for an external programming/debug interface since the HC08 family relies on a background-debug-mode (BDM) connector rather than in-system JTAG. Ensure decoupling capacitors are placed within 5 mm of the supply pins and reserve the oscillator pins for their declared function even when using the internal clock.
This page synthesizes distributor pricing, drop-in pin-compatible alternatives, and practical design notes not found in the bare manufacturer datasheet, saving engineers hours of cross-referencing work.
Drop-in alternatives for MC908GR32ACFJE — 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 MC908GR32ACFJE (same form factor and footprint) — differing in Program Memory Size, Manufacturer, Mounting Type, Core, Maximum Clock Frequency.
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No drop-in alternatives available for this product.
Request AlternativesMC908GR32ACFJE Maximum Ratings & Electrical Characteristics
| Manufacturer | NXP Semiconductors (Freescale) |
| Product Family | HC08 (M68HC08) |
| Core | 8-bit HC08 CPU |
| Program Memory Size | 32 KB (32K x 8) |
| Program Memory Type | FLASH |
| RAM Size | 1.5 KB |
| Number of I/O | 21 |
| Maximum Clock Frequency | 8 MHz (internal bus) |
| Oscillator Type | Internal |
| Package / Case | 32-LQFP (7 x 7 mm) |
| Mounting Type | Surface Mount |
| Operating Temperature | -40C to +85C |
| Packaging | Tray |
| Architecture Compatibility | M6805, M14805, M68HC05 upward-compatible object code |
MC908GR32ACFJE 32-lqfp (7 x 7 mm) Pin Configuration Guide
Pin configuration for MC908GR32ACFJE (32-lqfp (7 x 7 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 MC908GR32ACFJE.
Refer to the datasheet for full pin configuration.
Typical Applications
MC908GR32ACFJE is suitable for 6 applications: Industrial Sensor Interface Board, Consumer Appliance Control Board, Low-End Automotive Body Electronics (Non-Safety), HVAC Thermostat and Building Controls, Educational Trainer and Development Board, Smart Meter Peripheral Control.
Industrial Sensor Interface Board
The MC908GR32ACFJE's 32KB FLASH and 21 GPIO provide enough headroom for small analog-front-end signal-conditioning routines and digital I/O multiplexing on factory-floor sensor boards. The part's -40C to +85C industrial temperature range fits PLC backplane and proximity-sensor module operating environments. Compared with newer Cortex-M0+ parts, this HC08 MCU is favored only when integrating into existing HC08 firmware stacks or carrying forward legacy machine designs where the firmware is already validated. On-board BDM debug support enables fast field troubleshooting during commissioning cycles.
Recommended
Consumer Appliance Control Board
The MC908GR32ACFJE fits cost-sensitive consumer appliances such as coffee makers, microwave user-interface panels, and washing-machine control sub-modules where 32KB FLASH holds the user-interface state machine plus sensor-fault detection logic. Its low pin count (32-LQFP) and small package footprint make it ideal for compact appliance PCAs. The internal oscillator eliminates an external crystal in non-timing-critical sub-modules, shrinking the BOM and improving long-term reliability.
Recommended
Low-End Automotive Body Electronics (Non-Safety)
The MC908GR32ACFJE's 8-bit HC08 architecture supports interior lighting controllers, seat memory switches, and aftermarket accessory modules where the 21 GPIO bank interfaces directly to body wiring harnesses. The 32KB FLASH budget accommodates lighting-sequence macros and CAN/LIN-style bit-banging protocols. AEC-Q100 grade qualification should be verified against the specific lot when targeting safety-related functions; otherwise this part is appropriate for comfort and convenience subsystems only.
Recommended
HVAC Thermostat and Building Controls
Building automation thermostats, zone controllers, and damper actuators benefit from the MC908GR32ACFJE's 32KB FLASH + 1.5KB RAM combination for proportional-integral control loops and schedule logic. The 21 I/O pins handle multiple thermistor inputs, relay outputs, and a serial LCD or keypad. Because HVAC systems rarely demand >5 MHz CPU performance, the 8 MHz bus gives ample timing budget for accurate period scheduling while keeping power dissipation low.
Recommended
Educational Trainer and Development Board
The MC908GR32ACFJE is well suited to university microcontroller courses and entry-level embedded trainer kits because the HC08 architecture is mature, well-documented, and supported by free GNU C compilers. The 32-LQFP package is easy to hand-solder with breakout boards, and the BDM debug interface lets students step through assembly and C code at instruction level. Training boards typically pair the MCU with LEDs, push-buttons, and a simple UART link to a host PC.
Recommended
Smart Meter Peripheral Control
In smart electricity/water meter peripherals, the MC908GR32ACFJE's 32KB FLASH implements metrology calibration tables and tariff schedules while the 1.5KB RAM holds measurement frames. The HC08's deterministic interrupt latency suits time-slotted RF or PLC communication windows. However, designers should treat this part as a metrology-helper MCU only; regulatory billing logic typically requires a more capable companion processor with secure storage.
Recommended
Recommended Products Summary
Engineering reference data for MC908GR32ACFJE — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MC908GZ32VFJE | MC908GR32AMFJE | MC908GR32VAFJE | MC908GR32CFJE | MC908GR16ACFJE |
|---|---|---|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Package | 32-LQFP (7x7) | 32-LQFP (7x7) - same | 32-LQFP (7x7) - same | 32-LQFP (7x7) - same | 32-LQFP (7x7) - same | 32-LQFP (7x7) - same |
| Program Memory Size | 32 KB FLASH | 32 KB FLASH | 32 KB FLASH | 32 KB FLASH | 32 KB FLASH | 16 KB FLASH (-50%) |
| Bus Frequency | 8 MHz | 8 MHz | 8 MHz | 8 MHz | 8 MHz | 8 MHz |
| Number of I/O | 21 | 21 | 21 | 21 | 21 | 21 |
| Core | HC08 8-bit | HC08 8-bit | HC08 8-bit | HC08 8-bit | HC08 8-bit | HC08 8-bit |
| Internal Oscillator | Yes | Yes | Yes | Yes | Yes | Yes |
| Lifecycle Status | NRND | NRND | NRND | NRND | NRND | NRND |
Key Differentiators
- 32KB FLASH on 8-bit HC08 architecture (vs MC908GR16ACFJE)
- Established HC08 family with mature toolchain (vs Generic 8-bit MCU)
- Authorized aftermarket supply available (vs Generic 8-bit obsolete stock)
Design Notes
Place at least one 100 nF decoupling capacitor within 5 mm of each VDD/VSS pin pair on the MC908GR32ACFJE. For multi-supply-pinned HC08 derivatives, bulk-decouple with a single 10 uF tantalum or ceramic next to the package. The internal oscillator and FLASH charge-pump draw brief inrush currents during FLASH write cycles - keep the regulator sourced with adequate headroom. [DATA_NEEDED: exact VDD min/max] should be confirmed before finalizing power-tree sizing.
Route the BDM (Background Debug Mode) signal pair to a dedicated 2x5 or 1x6 header before PCB fabrication. The HC08 debug interface is essential for initial programming and field recovery, and post-layout rework to add a BDM connector is impractical on a 32-LQFP at 0.8 mm pitch. Reserve a small keep-out area above the package for any in-circuit emulator clip.
Do not assume the oscillator pins are user I/O when the internal oscillator is selected. Per the HC08 family datasheet, OSC1/OSC2 must be handled according to the specific oscillator-mode configuration bits - floating them in the wrong mode can lock up the device. For designs targeting long production runs, review the NXP S08 or S12 migration path now even if the immediate build uses MC908GR32ACFJE.
Compliance Information
RoHS and REACH compliance status for this specific lot could not be confirmed from the verified distributor pages; confirm with NXP product compliance team before shipping into regulated markets. Not AEC-Q100 qualified - use only for non-safety automotive sub-systems.