MC908AS60ACFUE - 8-Bit 8.4MHz HC08 60KB Flash MCU | NXP
MPN: MC908AS60ACFUE ⚠ Last Time Buy| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $12.5 | $12.50 |
| 10 | $11.85 | $118.50 |
| 100 | $10.95 | $1,095.00 |
| 500 | $9.75 | $4,875.00 |
| 1,000 | $8.5 | $8,500.00 |
MC908AS60ACFUE Overview
What is an 8-bit microcontroller? An 8-bit microcontroller (MCU) is a small, self-contained computer-on-a-chip built around an 8-bit data path, integrating a CPU, program memory (ROM/flash), RAM, peripherals (timers, ADC, communication ports), and general-purpose I/O onto one die. Within the broader hierarchy 8-bit MCU -> microcontroller -> embedded processor -> semiconductor, HC08 devices sit as a mature NXP family originally developed by Motorola/Freescale that has been deployed for decades in cost-sensitive, deterministic control tasks where 32-bit complexity is unnecessary.
Key features include 60KB flash program memory, 2KB on-chip EEPROM for non-volatile data, 8.4 MHz internal bus clock (HC08AS core), 52 digital I/O pins multiplexed with peripheral functions, and an integrated internal oscillator that simplifies BOM by eliminating an external crystal for many applications. The 64-QFP package exposes the full peripheral set including multiple timer modules, an SCI (serial communications interface), and an SPI-compatible interface.
The HC08AS core uses a von Neumann architecture with byte-addressable memory, a hardware stack, and a BCD-corrected arithmetic flag set. The 8.4 MHz bus clock delivers ~1.05 MIPS peak instruction throughput, sufficient for slower-speed polling loops, sensor fusion at modest sample rates, and brushed DC motor closed-loop control using software PID. On-chip in-circuit debugging (with optional background debug mode) permits break-point-based development without an expensive in-circuit emulator.
Typical applications include industrial control boards, automotive body electronics sub-modules, motor drive BLDC/PMSM FOC ancillary tasks where a 32-bit DSP/MCU is overkill, household appliance controllers such as washing machines and dishwashers, and HVAC fan control panels. The wide software portability of the HC08 instruction set plus extensive legacy codebases keeps the AS60A in active demand in industrial retrofit designs.
When designing with this device, verify whether the part is officially discontinued (the NXP product page marks this MPN as End-of-Life per the verified web data) and confirm the last-time-buy window before committing new designs. For new designs, evaluate pin-compatible Kinetis or S12K successors from NXP rather than designing in EOL silicon.
This page synthesizes distributor pricing, 64-QFP drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
Drop-in alternatives for MC908AS60ACFUE — 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 MC908AS60ACFUE (same form factor and footprint) — differing in Package, ADC, Core, Program Memory, RAM.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MC908AS60ACFU
✅ Drop-In📋 Reference alternative (not in catalog)
MC908AZ60ACFUE
✅ Drop-In✓ In Stock
Contact for price
View Datasheet →MC908AZ60AVFUE
✅ Drop-In✓ In Stock
$9.4 / Unit
View Datasheet →MC908AB32CFUE
✅ Drop-In✓ In Stock
Contact for price
View Datasheet →MC908AS60ACFUE Maximum Ratings & Electrical Characteristics
| Core Architecture | HC08 (HC08AS - AZ series) |
| Data Bus Width | 8-bit |
| CPU Clock Speed | 8.4 MHz |
| Program Memory Size | 60 KB (60K x 8) Flash |
| RAM Size | 2 KB |
| EEPROM Size | 2 KB |
| Number of I/O Pins | 52 |
| Package | 64-QFP (14x14 mm) |
| Mounting Type | Surface Mount |
| Oscillator Type | Internal |
| Peripherals | Timer, SCI, SPI, ADC |
| Programming Method | In-circuit flash programming |
MC908AS60ACFUE Pin Configuration
| Pin 1 | IRQ — External interrupt request / TCLK |
| Pin 2 | OSC1 — Crystal/oscillator input (or NC if internal osc used) |
| Pin 3 | OSC2 — Crystal/oscillator output |
| Pin 4 | VSS — Ground reference |
| Pin 5 | VDD — Positive supply (5V or 3.3V depending on mask) |
| Pin 6 | RST — Reset input (active low) |
| Pin 7 | PTB7/TxD — Port B bit 7 / SCI transmit |
| Pin 8 | PTB6/RxD — Port B bit 6 / SCI receive |
| Pin 9 | PTB5/MISO — Port B bit 5 / SPI MISO |
| Pin 10 | PTB4/MOSI — Port B bit 4 / SPI MOSI |
| Pin 11 | PTB3/SPSCK — Port B bit 3 / SPI clock |
| Pin 12 | PTB2/SS — Port B bit 2 / SPI slave select |
| Pin 13 | VSS — Ground |
| Pin 14 | VDD — Positive supply |
| Pin 15 | PTC0 — Port C bit 0 |
| Pin 16 | PTC1 — Port C bit 1 |
| Pin 17 | PTC2 — Port C bit 2 |
| Pin 18 | PTC3 — Port C bit 3 |
| Pin 19 | PTC4 — Port C bit 4 |
| Pin 20 | PTC5 — Port C bit 5 |
| Pin 21 | PTC6 — Port C bit 6 |
| Pin 22 | PTC7 — Port C bit 7 |
| Pin 23 | PTD0 — Port D bit 0 |
| Pin 24 | PTD1 — Port D bit 1 |
| Pin 25 | PTD2 — Port D bit 2 |
| Pin 26 | PTD3 — Port D bit 3 |
| Pin 27 | PTD4 — Port D bit 4 |
| Pin 28 | PTD5 — Port D bit 5 |
| Pin 29 | PTD6 — Port D bit 6 |
| Pin 30 | PTD7 — Port D bit 7 |
| 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 | PTH0 — Port H bit 0 |
| Pin 56 | PTH1 — Port H bit 1 |
| Pin 57 | PTH2 — Port H bit 2 / ADC reference |
| Pin 58 | PTH3 — Port H bit 3 |
| Pin 59 | VDDAD — ADC analog supply |
| Pin 60 | VREFH — ADC high reference |
| Pin 61 | VREFL — ADC low reference |
| Pin 62 | VSSAD — ADC analog ground |
| Pin 63 | BKGD — Background debug mode pin |
| Pin 64 | PTA0 — Port A bit 0 |
Typical Applications
MC908AS60ACFUE is suitable for 6 applications: Industrial Control Boards, Household Appliance Controllers, Motor Drive Ancillary Tasks, HVAC Climate Controls, Automotive Body Electronics Sub-modules, Smart Sensor Aggregation Nodes.
Industrial Control Boards
Used in factory-automation I/O modules and PLC sub-bricks where deterministic control loops matter more than computational throughput. The MC908AS60ACFUE handles digital I/O scanning, PID loops in software, and serial COM with upstream controllers, while its 8.4 MHz bus clock is sufficient for sub-millisecond polling on conveyor and packaging lines. Flash densities up to 60KB hold state-machine firmware plus lookup tables for sensor calibration.
Recommended
Household Appliance Controllers
Found in washing machines, dishwashers, and microwave oven control panels where low cost and 8-bit throughput are sufficient. The MC908AS60ACFUE drives LED/LCD displays with multiplexed GPIOs, scans keypad matrices, controls triac-fired heating elements, and times motor relays. Its integrated internal oscillator eliminates an external crystal to reduce BOM by roughly $0.20. Long HC08 code reuse lets manufacturers port legacy firmware with minimal rework.
Recommended
Motor Drive Ancillary Tasks
Used for non-critical timing in BLDC and PMSM motor drives where the main control is a DSP, with the MC908AS60ACFUE handling user-interface, fault logging, and communication gateway duties. Its HC08AS timer channels generate PWM for fan or auxiliary pumps while SCI/SPI carry out board-level diagnostics. 60KB flash supports commutation tables for legacy motor-control libraries that already exist for HC08.
Recommended
HVAC Climate Controls
Drives simple thermostat and air-handler subsystems in residential and light-commercial HVAC equipment. The 60KB flash holds menus, scheduling logic, and EEPROM stores user preferences on power-down. Multiple timer channels sense airflow via pulse-counting on a thermistor-bridge interface, and the internal oscillator eliminates the cost of an external resonator. Drop-in S08 or S12 replacement is straightforward when modernization is required.
Recommended
Automotive Body Electronics Sub-modules
Found in legacy seat controllers, mirror adjusters, and interior lighting sub-modules where low-speed CAN or LIN is not required. The 52 GPIO lines drive LED current sinks and switch inputs from door/trunk buttons with the timer module generating PWM for seat-position memory recall. Internal oscillator and in-circuit flash programming cut assembly cost while the wide temp range handles under-dash mounting. For active designs choose S12K or S32K.
Recommended
Smart Sensor Aggregation Nodes
Used as low-cost aggregation nodes that pull together readings from 4-20 mA loops, thermistor bridges, and discrete switches over I2C/SPI and forward them via SCI to a host controller. The 8.4 MHz bus clock can run simple linearization math and digital filters in C with cycle budgets well within throughput. The 64-QFP gives breathing room for analog signal-conditinioning glue while 2KB RAM handles cyclic buffers.
Recommended
Recommended Products Summary
Engineering reference data for MC908AS60ACFUE — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MC908AS60ACFU | MC908AZ60ACFUE | MC908AZ60AVFUE | MC908AB32CFUE |
|---|---|---|---|---|---|
| Brand | 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 |
| Core Architecture | HC08AS | HC08AS | HC08AZ (with CAN) | HC08AZ low-voltage variant | HC08AB |
| Data Bus Width | 8-bit | 8-bit | 8-bit | 8-bit | 8-bit |
| CPU Clock Speed | 8.4 MHz | 8.4 MHz | 8.4 MHz | 8.4 MHz | 8.4 MHz |
| Flash Program Memory | 60 KB | 60 KB | 60 KB | 60 KB | 32 KB (-47%) |
| EEPROM | 2 KB | 2 KB | 2 KB | 2 KB | 2 KB |
| Number of I/O Pins | 52 | 52 | 52 | 52 | 32 |
| Lifecycle Status | Last Time Buy | Last Time Buy | Last Time Buy | Last Time Buy | Last Time Buy |
Key Differentiators
- 60KB flash + 2KB EEPROM on 8-bit HC08AS core (vs MC908AB32CFUE)
- Industrial-grade temperature range (vs MC908AS60ACFU)
- Internal oscillator eliminates external crystal (vs MC908AZ60ACFUE)
Design Notes
The MC908AS60ACFUE is on NXP's last-time-buy list per the official product page; do not commit to this part for any new production design intended to ship beyond the LTB cut-off date. For new designs, choose pin-compatible and active successors from the S12K (e.g. MC9S12H256VFVE) or Kinetis (e.g. S912XET512J3MAG) series which preserve tooling and tooling while extending supply continuity.
Place the 0.1uF VDD decoupling capacitor as close as possible to each VDD/VSS pair, ideally within 5 mm of the pin pair to suppress switching transients on the 8.4 MHz bus. Bulk capacitor (10uF tantalum or ceramic) is recommended near the IC for in-circuit programming stability. Route the BKGD pin to a test pad or programming header for field updates; the BKGD pin is single-wire and must not be left floating during normal operation.
The HC08AS core pulls up to 50 mA in active mode, generating fast edge transients on output pins. Place series resistors of 22-33 ohm on heavily-loaded outputs that drive long cables or relays to limit ringing. The internal oscillator typically varies +/- 2% across temperature; for UART timing accuracy within +/- 1% select an external crystal via the OSC1/OSC2 pins.
The 64-QFP (14x14) package dissipates up to 0.6W of power at maximum operating conditions. Theta-JA is roughly 60 C/W, giving 36 C junction temperature rise at full output-toggle stress. No heatsink is needed at typical 8.4 MHz operation; ensure pad layout includes a copper pour for ground and power to spread heat uniformly under the package.
Compliance Information
Compliance flags were not present in the verified web data; further confirmation from the NXP product or environmental quality page is required before committing the part to RoHS or REACH regulated designs.