MC908AB32VFUE - 8-Bit HC08 MCU 32KB Flash 8MHz | NXP
MPN: MC908AB32VFUE ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $45.5636 | $45.56 |
| 10 | $42 | $420.00 |
| 100 | $38.5 | $3,850.00 |
| 500 | $35 | $17,500.00 |
| 1,000 | $31.75 | $31,750.00 |
MC908AB32VFUE Overview
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory (Flash/ROM), data memory (RAM), peripheral set (timers, ADC, communications), and I/O pins into one package. The HC08 family uses a CISC architecture with variable-length instructions, BCD arithmetic support, and a 16-bit stack pointer, positioning the MC908AB32VFUE as a general-purpose controller for deterministic real-time tasks rather than high-throughput digital signal work. Within the embedded taxonomy, this part is a micro-controller -> microcontroller -> integrated circuit -> semiconductor.
Key features that distinguish the MC908AB32VFUE include 32KB of in-system programmable Flash (allowing field firmware updates), 1KB of on-chip RAM, an 8-channel 8-bit ADC, multiple timers, SCI and SPI serial interfaces, and up to 51 general-purpose I/O pins. The 64-QFP package provides ample pinout for parallel bus peripherals and analog signal conditioning without forcing the designer to a fine-pitch BGA.
Architecturally, the part uses a Von Neumann memory map with the HC08 CPU core. Internal Flash can be erased sector-by-sector, supporting boot-loader patterns. The 8MHz bus rate provides 125ns minimum instruction cycle, adequate for slow-control loops and user-interface debouncing.
Typical applications include HVAC damper control, washing-machine motor sequencing, automotive instrument clusters, security keypads, and low-end point-of-sale terminals. The wide I/O count suits designs with many LED indicators, key matrices, or relay drivers.
A critical design consideration is that the HC08AB series is no longer in active production - design teams should verify NXP's longevity program status and plan a migration path to ColdFire V1 or Kinetis E series for new designs, while using this part only for legacy product maintenance or verified long-life programs.
This page consolidates distributor stock indicators, package-level drop-in equivalents from the same HC08 family, and practical design notes not aggregated in a single datasheet - giving engineers a one-stop replacement and migration reference.
Drop-in alternatives for MC908AB32VFUE — 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 MC908AB32VFUE (same form factor and footprint) — differing in Package, Supply Voltage, RAM Size, Number of I/O, Program Memory Size.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MC908AB32MFUE
✅ Drop-In✓ In Stock
Contact for price
View Datasheet →MC908GZ32MFUE
✅ Drop-In✓ In Stock
$10.95 / Unit
View Datasheet →MC908GZ32VFUE
✅ Drop-In✓ In Stock
$5.15 / Unit
View Datasheet →MC908GR32ACFUE
✅ Drop-In✓ In Stock
$5.25 / Unit
View Datasheet →MC908AS60AVFUE
✅ Drop-In📋 Reference alternative (not in catalog)
MC908AB32VFUE Maximum Ratings & Electrical Characteristics
| Core Architecture | HC08 (8-bit CISC) |
| Family | M68HC908AB |
| Program Memory (Flash) | 32 KB (32K x 8) |
| RAM Size | 1 KB (1K x 8) |
| Maximum Clock Frequency | 8 MHz |
| Bus Speed | 8 MHz internal |
| Number of I/O Pins | 51 |
| Supply Voltage | 3.3 V / 5 V dual-range |
| Package | 64-pin QFP (14x14 mm) |
| Mounting Type | Surface Mount |
| Operating Temperature | -40 C to +105 C (industrial) |
| Serial Interfaces | SCI, SPI |
| Tray Packaging | Yes (Tray) |
| Original Manufacturer | Freescale Semiconductor (now NXP) |
MC908AB32VFUE Pin Configuration
| Pin 1 | IRQ — External interrupt request |
| Pin 2 | VDD — Supply voltage (3.3V/5V) |
| Pin 3 | VSS — Ground |
| Pin 4 | OSC1 — Crystal oscillator input |
| Pin 5 | OSC2 — Crystal oscillator output |
| Pin 6 | RST — Reset (active low) |
| Pin 7 | PTB0 — Port B bit 0 / ADC channel |
| Pin 8 | PTB1 — Port B bit 1 / ADC channel |
| Pin 9 | PTB2 — Port B bit 2 / ADC channel |
| Pin 10 | PTB3 — Port B bit 3 / ADC channel |
| Pin 11 | PTB4 — Port B bit 4 / ADC channel |
| Pin 12 | PTB5 — Port B bit 5 / ADC channel |
| Pin 13 | PTB6 — Port B bit 6 / ADC channel |
| Pin 14 | PTB7 — Port B bit 7 / ADC channel |
| Pin 15 | PTC0 — Port C bit 0 / TxD (SCI) |
| Pin 16 | PTC1 — Port C bit 1 / RxD (SCI) |
| Pin 17 | PTC2 — Port C bit 2 / SCLK (SPI) |
| Pin 18 | PTC3 — Port C bit 3 / MOSI (SPI) |
| Pin 19 | PTC4 — Port C bit 4 / MISO (SPI) |
| Pin 20 | PTC5 — Port C bit 5 / SS (SPI) |
| Pin 21 | PTC6 — Port C bit 6 |
| Pin 22 | PTC7 — Port C bit 7 |
| Pin 23 | PTD0 — Port D bit 0 / Timer channel |
| Pin 24 | PTD1 — Port D bit 1 / Timer channel |
| Pin 25 | PTD2 — Port D bit 2 / Timer channel |
| Pin 26 | PTD3 — Port D bit 3 / Timer channel |
| Pin 27 | PTD4 — Port D bit 4 / Timer channel |
| Pin 28 | PTD5 — Port D bit 5 / Timer channel |
| Pin 29 | PTD6 — Port D bit 6 / Timer channel |
| Pin 30 | PTD7 — Port D bit 7 / Timer channel |
| Pin 31 | PTE0 — Port E bit 0 |
| Pin 32 | PTE1 — Port E bit 1 |
| Pin 33 | PTE2 — Port E bit 2 |
| Pin 34 | PTE3 — Port E bit 3 |
| Pin 35 | PTE4 — Port E bit 4 |
| Pin 36 | PTE5 — Port E bit 5 |
| Pin 37 | PTE6 — Port E bit 6 |
| Pin 38 | PTE7 — Port E bit 7 |
| Pin 39 | PTF0 — Port F bit 0 |
| Pin 40 | PTF1 — Port F bit 1 |
| Pin 41 | PTF2 — Port F bit 2 |
| Pin 42 | PTF3 — Port F bit 3 |
| Pin 43 | PTF4 — Port F bit 4 |
| Pin 44 | PTF5 — Port F bit 5 |
| Pin 45 | PTF6 — Port F bit 6 |
| Pin 46 | PTF7 — Port F bit 7 |
| Pin 47 | PTG0 — Port G bit 0 |
| Pin 48 | PTG1 — Port G bit 1 |
| Pin 49 | PTG2 — Port G bit 2 |
| Pin 50 | PTG3 — Port G bit 3 |
| Pin 51 | PTG4 — Port G bit 4 |
| Pin 52 | PTG5 — Port G bit 5 |
| Pin 53 | PTG6 — Port G bit 6 |
| Pin 54 | PTG7 — Port G bit 7 |
| Pin 55 | VDD — Supply voltage |
| Pin 56 | VSS — Ground |
| Pin 57 | VDDAD — ADC supply voltage |
| Pin 58 | VREFH — ADC reference high |
| Pin 59 | VREFL — ADC reference low |
| Pin 60 | PTH0 — Port H bit 0 |
| Pin 61 | PTH1 — Port H bit 1 |
| Pin 62 | PTH2 — Port H bit 2 |
| Pin 63 | PTH3 — Port H bit 3 |
| Pin 64 | BKGD — Background debug mode |
Typical Applications
MC908AB32VFUE is suitable for 6 applications: White Goods Motor Control, Automotive Body Controllers, Security Keypad Panels, HVAC Damper Control, Low-End Point-of-Sale Terminals, Industrial User Interface Panels.
White Goods Motor Control
The MC908AB32VFUE fits washing-machine and dishwasher motor sequencing because its 8MHz HC08 core, 51 I/O pins, and 8-channel ADC provide enough throughput to drive triac-controlled universal motors and read current/voltage feedback. The 32KB Flash accommodates state-machine firmware for wash cycles, while 1KB RAM supports ramp tables and EEPROM emulation. Designers appreciate the 64-QFP package for hand-solder-friendly rework versus fine-pitch BGAs. Unlike ARM Cortex replacements, this part runs deterministic real-time loops without RTOS overhead, simplifying IEC 60730 safety certification for household appliances.
Recommended
Automotive Body Controllers
The MC908AB32VFUE serves automotive body modules (BCM) controlling lighting, wipers, and door locks because its 64-QFP footprint fits the existing BCM PCB layout and its industrial -40C to +105C temperature range covers cabin environments. The 51 I/O pins drive relay arrays and read switch matrices, while SCI/SPI interfaces connect to LIN transceivers for body network communication. AEC-Q100 qualification status should be confirmed at order entry - the standard VFUE suffix typically denotes industrial grade; automotive customers may require the CFUE (AEC-Q100) suffix instead.
Recommended
Security Keypad Panels
The MC908AB32VFUE powers commercial security keypads and access-control panels where its 51 I/O pins read 4x4 or 5x5 key matrices and drive LED indicators without external logic. The 32KB Flash stores PIN validation firmware and EEPROM emulation for credential storage. At 8MHz, debounce and scanning loops run well within real-time margins. The 64-QFP package supports both wave-soldered and reflow assembly, easing mixed-technology panel manufacturing. Designers migrating to ARM Cortex should note the Kinetis E footprint change requires PCB rework.
Recommended
HVAC Damper Control
The MC908AB32VFUE fits HVAC damper actuator controllers because its 8-channel ADC reads temperature sensors and potentiometer feedback while its timers drive PWM outputs for servo positioning. The 32KB Flash accommodates PID loop firmware and seasonal compensation tables. Industrial -40C to +105C operation handles unconditioned mechanical rooms. Designers using this part in building automation can leverage the 64-QFP footprint across multiple damper SKUs and share PCB layout, reducing NRE cost. Consider the CFUE (AEC-Q100) variant if the controller is co-located with automotive-grade transceivers.
Recommended
Low-End Point-of-Sale Terminals
The MC908AB32VFUE integrates the key elements of a low-end POS terminal - keypad scanning, LCD character display driving, magnetic-stripe reader interface, and serial receipt printer control - through its 51 I/O pins, SCI/SPI interfaces, and timers. At 8MHz, transaction firmware runs in real time without RTOS. The 32KB Flash stores price look-up tables and encryption keys; 1KB RAM handles transaction buffers. Designers should plan migration to Kinetis E with secure boot for new PCI-PTS certified terminals, since this NRND part lacks modern cryptographic acceleration.
Recommended
Industrial User Interface Panels
The MC908AB32VFUE drives industrial HMI panels with LED indicators, 7-segment displays, and rotary encoder inputs through its 51 I/O pins and timers. Its 64-QFP package supports a mix of through-hole and SMD peripherals on the same PCB, simplifying panel assembly. Flash-resident firmware handles menu navigation, setpoint entry, and alarm logging. Industrial -40C to +105C operation covers factory floor conditions. The HC08 CISC architecture simplifies certification audits because no RTOS is involved, reducing documentation overhead versus ARM Cortex alternatives that typically require FreeRTOS or Azure RTOS qualification.
Recommended
Recommended Products Summary
Engineering reference data for MC908AB32VFUE — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MC908AB32MFUE | MC908GZ32MFUE | MC908GZ32VFUE | MC908GR32ACFUE | MC908AS60AVFUE |
|---|---|---|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Package | 64-QFP (14x14) | 64-QFP (14x14) - same | 64-QFP (14x14) - same | 64-QFP (14x14) - same | 64-QFP (14x14) - same | 64-QFP (14x14) - same |
| Program Memory (Flash) | 32 KB | 32 KB | 32 KB | 32 KB | 32 KB | 60 KB (+88%) |
| RAM Size | 1 KB | 1 KB | 1.5 KB | 1.5 KB | 2 KB | 2 KB |
| Maximum Clock Speed | 8 MHz | 8 MHz | 8 MHz | 8 MHz | 8 MHz | 8 MHz |
| Supply Voltage | 3.3 V / 5 V | 3.3 V / 5 V | 3.3 V / 5 V | 3.3 V / 5 V | 3.3 V / 5 V | 3.3 V / 5 V |
| Core Architecture | HC08 (8-bit CISC) | HC08 (8-bit CISC) | HC08 (8-bit CISC) | HC08 (8-bit CISC) | HC08 (8-bit CISC) | HC08 (8-bit CISC) |
Key Differentiators
- Same QFP-64 footprint as multiple HC08 family members (vs MC908AS60AVFUE)
- Highest RAM among the listed alternatives (after GR/AS series) (vs MC908GZ32MFUE)
- Established second-source ecosystem (vs MC908GR32ACFUE)
Design Notes
The MC908AB32VFUE is NRND (Not Recommended for New Designs) - new product designs should select Kinetis E (MKE04Z) or ColdFire V1 (MCF51EM) replacements. For legacy maintenance or longevity-program products, verify continued supply via NXP's PLP. Do not start a new commercial product line on this part - allocation risk is high and price has risen materially compared to active Cortex-M0+ alternatives.
Route the 64-QFP package with 0.8 mm pitch using 0.4 mm-wide conductors and 0.2 mm spacing. Decouple each VDD pin with a 100 nF ceramic capacitor placed within 5 mm of the pin; add a bulk 10 uF tantalum or aluminum polymer near the package. The VREFH/VREFL pins must be bypassed with a low-ESR 100 nF capacitor and routed as a Kelvin pair back to the supply to avoid ADC noise injection.
Estimated: at 8 MHz clock and 5 V supply with all peripherals active, the HC08 core draws roughly 25-35 mA. Power dissipation stays below 200 mW even at worst case, so no heatsink is needed. Add a series ferrite bead on the analog VDDAD supply to isolate digital switching noise from the ADC reference - this is critical for accurate ADC readings on the 8 analog channels.
Compliance Information
Compliance status not explicitly provided in verified data. Industrial temperature grade (-40C to +105C) implied by the VFUE suffix per Freescale/NXP legacy naming convention. Verify RoHS/REACH at order entry.
