MC68908GZ16MFJE - HC08 8-bit MCU 16KB Flash 32-LQFP | NXP
MPN: MC68908GZ16MFJE ⚠ Last Time Buy| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $12.5 | $12.50 |
| 10 | $11.2 | $112.00 |
| 100 | $9.85 | $985.00 |
| 500 | $8.4 | $4,200.00 |
| 1,000 | $7.1 | $7,100.00 |
MC68908GZ16MFJE Overview
An 8-bit microcontroller is a single-chip computer that integrates a CPU, memory (Flash for program storage and RAM for data), and peripherals on a single die. The HC08 family occupies the low-cost, high-performance tier of 8-bit MCUs, sitting below 16-bit and 32-bit microcontrollers in the embedded hierarchy. HC08 devices use a von Neumann architecture with a CPU08 core that executes one instruction per internal bus cycle, and they are programmed primarily in C using the CodeWarrior toolchain. The GZ sub-family specifically targets cost-sensitive embedded control with on-chip CAN-style and timer modules.
Key features of the MC68908GZ16MFJE include 16KB (16K x 8) Flash program memory, 1KB on-chip RAM, an 8 MHz maximum bus frequency, multiple timers, an A/D converter, and serial communication interfaces. The 32-LQFP surface-mount package provides 32 pins with a 0.8 mm pitch and a 7x7 mm body, making it suitable for space-constrained industrial and consumer designs. The HC08GZ family supports background debug mode (BDM) for in-circuit programming and debugging.
The part is fabricated in CMOS technology and is rated for operation over the standard -40C to +85C industrial temperature range. It is moisture sensitivity level (MSL) 3 with a peak reflow temperature of 260C and a maximum time-at-peak-reflow of 40 seconds. The device is lead-free (matte tin terminal finish), and the LQFP-32 package is RoHS compliant.
Typical applications for the MC68908GZ16MFJE include industrial control, motor control, sensor interfacing, building automation, low-end automotive body electronics, and consumer appliances. The HC08 platform is widely deployed in legacy designs where long-term firmware stability and known toolchain support matter more than raw CPU throughput. The 16KB Flash budget suits moderate state-machine and small protocol-stack firmware.
When designing with this part, verify your firmware fits within the 16KB Flash and 1KB RAM budgets and that the chosen compiler target matches CPU08. The 8 MHz bus frequency constrains instruction throughput, so benchmark critical inner loops before final selection.
This page synthesizes distributor availability from Mouser, DigiKey, and Octopart with package-level drop-in alternatives and HC08 design notes not collated on any single datasheet distributor page.
Drop-in alternatives for MC68908GZ16MFJE — 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 MC68908GZ16MFJE (same form factor and footprint) — differing in Package.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MC68908GZ16CFJE
✅ Drop-In📋 Reference alternative (not in catalog)
MC908GZ16MFAE
✅ Drop-In✓ In Stock
$7.9001 / Unit
View Datasheet →MC68908GZ16MFJE Maximum Ratings & Electrical Characteristics
| Manufacturer | NXP Semiconductors |
| Family | HC08GZ (HC08 series, CPU08 core) |
| Core | M68HC08 (CPU08) |
| Data Bus Width | 8 bit |
| Program Memory Size | 16 KB (16K x 8) Flash |
| RAM Size | 1 KB |
| On-chip ROM (routines) | 406 bytes |
| Maximum Clock Frequency | 8 MHz |
| Package | 32-LQFP (7x7 mm) |
| Mounting Type | Surface Mount |
| Technology | CMOS |
| Operating Temperature | -40C to +85C (industrial) |
| MSL Level | MSL 3 |
| Peak Reflow Temperature | 260C (max 40 s) |
| Terminal Finish | Matte tin (lead-free) |
| RoHS | Compliant |
| Debug Interface | Background Debug Mode (BDM) |
MC68908GZ16MFJE Pin Configuration
| Pin 1 | IRQ — External interrupt request |
| Pin 2 | TCLK — Timer clock input |
| Pin 3 | RESET — Reset input (active low) |
| Pin 4 | VSS — Ground |
| Pin 5 | VDD — Power supply +5V |
| Pin 6 | PTB0 — Port B bit 0 (general I/O) |
| Pin 7 | PTB1 — Port B bit 1 (general I/O) |
| Pin 8 | PTB2 — Port B bit 2 (general I/O) |
| Pin 9 | PTB3 — Port B bit 3 (general I/O) |
| Pin 10 | PTB4 — Port B bit 4 (general I/O) |
| Pin 11 | PTB5 — Port B bit 5 (general I/O) |
| Pin 12 | PTB6 — Port B bit 6 (general I/O) |
| Pin 13 | PTB7 — Port B bit 7 (general I/O) |
| Pin 14 | PTA0 — Port A bit 0 / A/D channel |
| Pin 15 | PTA1 — Port A bit 1 / A/D channel |
| Pin 16 | PTA2 — Port A bit 2 / A/D channel |
| Pin 17 | PTA3 — Port A bit 3 / A/D channel |
| Pin 18 | PTA4 — Port A bit 4 / A/D channel |
| Pin 19 | PTA5 — Port A bit 5 / A/D channel |
| Pin 20 | PTA6 — Port A bit 6 / A/D channel |
| Pin 21 | PTA7 — Port A bit 7 / A/D channel |
| Pin 22 | TXD — SCI transmit |
| Pin 23 | RXD — SCI receive |
| Pin 24 | SPSCK — SPI clock |
| Pin 25 | MOSI — SPI master-out / slave-in |
| Pin 26 | MISO — SPI master-in / slave-out |
| Pin 27 | SS — SPI slave select |
| Pin 28 | TPM1CH0 — Timer/PWM channel 0 |
| Pin 29 | TPM1CH1 — Timer/PWM channel 1 |
| Pin 30 | TPM1CH2 — Timer/PWM channel 2 |
| Pin 31 | TPM1CH3 — Timer/PWM channel 3 |
| Pin 32 | BKGD — Background Debug Mode data |
Typical Applications
MC68908GZ16MFJE is suitable for 7 applications: Industrial Control Systems, Low-End Motor Control, Building Automation, Consumer Appliances, Sensor Interface Modules, Automotive Body Electronics, Legacy Product Sustaining.
Industrial Control Systems
The MC68908GZ16MFJE fits industrial control PLCs, sensor-interface nodes, and small process-control modules where 16KB Flash and 1KB RAM hold a deterministic state machine plus communication stack fragments. Its 8 MHz CPU08 core delivers predictable interrupt latency, and the on-chip timers plus A/D cover typical analog-signal conditioning tasks. Engineers favor this part for cost-bound control panels and remote I/O blocks where modern 32-bit MCUs would inflate the BOM. The 32-LQFP package sits comfortably on a 4-layer industrial-grade PCB with standard lead-free reflow.
Recommended
Low-End Motor Control
Use the MC68908GZ16MFJE to drive small brushed DC or stepper motors where the control algorithm fits in 16KB Flash and the current-loop update fits in the 1KB RAM envelope. The HC08GZ timers provide PWM channels for brushed DC and unipolar stepper topologies, and the on-chip A/D reads back-EMF or shunt current for closed-loop control. It is not appropriate for sensorless FOC of three-phase motors where higher MIPS and dedicated motor-control peripherals are required. The 32-LQFP package exposes enough pins for H-bridge gate signals plus encoder feedback.
Recommended
Building Automation
Deploy the MC68908GZ16MFJE in HVAC dampers, lighting controllers, smart thermostats, and access-control readers where its 16KB Flash holds the application state machine and a thin proprietary protocol stack. The -40C to +85C industrial temperature rating suits unconditioned equipment rooms and rooftop units. The BDM interface enables in-field firmware updates during commissioning, and the 32-LQFP package fits behind a connector cluster on a low-cost 2-layer PCB. Pair it with a low-cost AC-zero-cross detector and a triac driver to form a complete dimmer node.
Recommended
Consumer Appliances
The MC68908GZ16MFJE is well suited to washing-machine user-interface boards, microwave key panels, dishwasher controllers, and small kitchen appliances that need a deterministic 8-bit core with simple I/O and timers. The 16KB Flash comfortably stores menu logic, button debouncing, and LED/LCD driving routines, while 1KB RAM handles keypad buffers and timer states. The 32-LQFP package is mechanically compatible with hand-soldered rework stations, simplifying after-sale repair. Use the on-chip A/D to read NTC temperature sensors and potentiometers for user feedback.
Recommended
Sensor Interface Modules
Build stand-alone sensor interface modules with the MC68908GZ16MFJE to read strain gauges, thermistors, or 4-20 mA loops, perform linearization, and forward results via UART, SPI, or I2C. The on-chip A/D combined with the CPU08's deterministic loop timing makes it a cost-effective signal conditioner that can run forever on a few milliamps. The 16KB Flash accommodates look-up tables for sensor linearization and protocol stacks for Modbus or proprietary fieldbuses. Use the BDM interface for in-the-field calibration updates without removing the module from service.
Recommended
Automotive Body Electronics
The MC68908GZ16MFJE supports non-safety automotive body functions such as seat controllers, mirror adjusters, interior lighting, and door modules where its 16KB Flash and 8 MHz CPU08 are sufficient. Note that the standard industrial grade is rated only to +85C, so it is restricted to cabin-class body modules rather than under-hood or powertrain applications that require AEC-Q100 and +125C. For those harsher environments migrate to AEC-Q100 qualified Kinetis E-series parts. The 32-LQFP package is well supported by automotive EMS lines and lead-free reflow profiles.
Recommended
Legacy Product Sustaining
The MC68908GZ16MFJE is most commonly used today to sustain long-life legacy products where firmware was developed and validated against the HC08 toolchain years ago. Because it is in Last Time Buy (LTB), design teams typically place a final LTB order plus safety stock while porting the firmware to the NXP-recommended replacement part listed in the PCN. The 32-LQFP footprint and CPU08 object code remain compatible with other 32-LQFP HC08GZ siblings, easing the bridging period. Use the BDM interface to validate the ported firmware against the original hardware before cutover.
Recommended
Recommended Products Summary
Engineering reference data for MC68908GZ16MFJE — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MC68908GZ16CFJE | MC908GZ16MFAE |
|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Package | 32-LQFP (7x7 mm) | 32-LQFP (7x7 mm) | 32-LQFP |
| Core | HC08 (CPU08), 8-bit | HC08 (CPU08), 8-bit | HC08 (CPU08), 8-bit |
| Program Memory | 16 KB Flash | 16 KB Flash | 16 KB Flash |
| RAM | 1 KB | 1 KB | 1 KB |
| Max Clock Frequency | 8 MHz | 8 MHz | 8 MHz |
| Operating Temperature | -40C to +85C | -40C to +85C (industrial) | -40C to +85C (industrial) |
| RoHS | Compliant | Compliant | Compliant |
| Lifecycle Status | Last Time Buy | Last Time Buy | Discontinued / Last Time Buy |
Key Differentiators
- Established HC08GZ family member with mature toolchain (vs MC908GZ16MFAE)
- Industry-standard 32-LQFP 7x7 mm footprint (vs MC908GZ16CFAE)
- Industrial -40C to +85C temperature grade (vs MC68908GZ16CFJE)
Design Notes
Estimated: at 8 MHz with all peripherals active and 5V VDD, the MC68908GZ16MFJE draws roughly 25 mA (about 125 mW) and the 32-LQFP theta_JA is approximately 70 C/W on a 2-layer JEDEC test board, giving a junction temperature rise of ~9C above ambient. Operation to +85C ambient therefore keeps the junction well below the +150C absolute maximum with comfortable margin. For sealed enclosures with limited airflow, derate ambient by 10C. Above 70C ambient, fit a small copper pour under the exposed die-pad area to drop theta_JA by 15-20%.
Place a 100 nF decoupling capacitor within 5 mm of the VDD pin and a bulk 10 uF tantalum or ceramic capacitor on the same supply rail as close to the MCU as practical. Add a 10 kohm pull-up on RESET and a 1 nF capacitor to ground for a clean power-on reset, or use an external voltage supervisor for noisy industrial rails. The BKGD pin requires a 4.7 kohm pull-up to VDD for reliable background debug mode operation; do not leave it floating or BDM lockup can occur.
Do not migrate HC08 firmware between mask revisions (for example GZ16MFJE to GZ16CFJE) without re-validating the interrupt vector table, since mask revisions can move peripheral modules to different memory maps. The 1 KB RAM envelope is consumed quickly by large stack frames and printf-style logging; profile stack depth at compile time with the CodeWarrior map file. Finally, verify the BDM pod firmware version matches the target silicon mask before production programming, or you can brick the Flash securely bits and lock yourself out.
Route the external crystal or resonator traces symmetrically and as short as possible, with the load capacitors placed within 3 mm of the OSC pins and a ground guard ring around the oscillator cell to attenuate radiated emissions. Keep the RESET trace away from PWM and timer output traces to avoid coupling. If using the on-chip A/D, route analog inputs away from digital switching lines and add a ground pour between the analog and digital sections of the LQFP.
Compliance Information
RoHS compliant per NXP product page. Lead-free matte tin terminal finish. MSL 3 with 260C peak reflow. Not AEC-Q100 qualified; restrict to industrial / cabin-class automotive applications.