MC9S08AW32CFUE - 8-Bit 40MHz 32KB Flash MCU | NXP S08
MPN: MC9S08AW32CFUE ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $13.09 | $13.09 |
| 10 | $11.78 | $117.80 |
| 100 | $9.85 | $985.00 |
| 500 | $8.42 | $4,210.00 |
| 1,000 | $7.18 | $7,180.00 |
MC9S08AW32CFUE Overview
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory (Flash/ROM), data memory (RAM), and a mix of peripherals on one die. Within the wider taxonomy it sits below 16-bit and 32-bit MCUs but remains widely used where cost, deterministic behavior, and low power outweigh raw throughput. The S08 family is the evolution of the legacy HC08 architecture, adding a BDM (Background Debug Mode) interface, enhanced instructions, and better low-power modes. Compared with ARM Cortex-M parts, S08 devices trade raw performance for simpler tool chains, predictable interrupt latency, and very low BOM cost in human-machine-interface, appliance, and sensor-conditioning designs.
Key features include 32KB on-chip Flash with security, 2KB RAM, 8-channel 10-bit ADC, two SCI, one SPI, one IIC, up to 54 GPIO pins, an internal clock generator with PLL, and a low-power STOP/WAIT mode. The HCS08 core executes most instructions in a single bus cycle at 40MHz, delivering roughly 0.6-0.7 MIPS per MHz of effective throughput. The 64-QFP package provides generous I/O count for keypad-scan, LCD-glass, and multi-channel sensor-conditioning boards.
Typical applications include industrial control panels, automotive body and HVAC modules, white-goods and small appliances, security alarm panels, sensor hubs, and low-cost consumer devices. The wide 2.7-5.5V supply range lets it share a 3.3V or 5V rail with analog signal-conditioning circuitry.
When designing with this part, place a 0.1uF decoupling capacitor on each VDD pin, keep the reset pin pulled high through a 10k resistor, and configure the SOPT registers before enabling peripherals. Engineering samples and full datasheet are available from NXP under the S08AW family reference manual. This page synthesizes distributor pricing, drop-in same-family alternatives, and practical design notes beyond what the manufacturer datasheet alone provides.
Drop-in alternatives for MC9S08AW32CFUE — 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 MC9S08AW32CFUE (same form factor and footprint) — differing in Package, Core, Operating Temperature Range, Timers, Debug Interface.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MC9S08AW32CFUER
✅ Drop-In📋 Reference alternative (not in catalog)
MC9S08AW32MFGE
✅ Drop-In✓ In Stock
$3.15 / Unit
View Datasheet →MC9S08AW32VFGE
✅ Drop-In✓ In Stock
$3.3 / Unit
View Datasheet →S9S08AW32E5MPUE
✅ Drop-In✓ In Stock
$3.95 / Unit
View Datasheet →S9S08AW60E5MFGE
✅ Drop-In✓ In Stock
$6.05 / Unit
View Datasheet →MC9S08AW32CFUE Maximum Ratings & Electrical Characteristics
| Core | S08 (HCS08 enhanced 8-bit) |
| Program Memory | 32 KB Flash |
| RAM | 2 KB |
| Maximum CPU Frequency | 40 MHz |
| Operating Voltage | 2.7 V to 5.5 V |
| ADC | 10-bit, 8-channel |
| Communication Interfaces | 2x SCI (UART), 1x SPI, 1x IIC |
| Timers | Multiple TPM/MTIM (see datasheet) |
| GPIO | Up to 54 |
| Package | 64-QFP (14x14 mm) |
| Mounting Type | Surface Mount |
| Operating Temperature | -40C to +85C (industrial) |
| MSL Level | 3 |
| RoHS Status | Compliant |
| Debug Interface | BDM (Background Debug Mode) |
| Lead-Free | Yes |
MC9S08AW32CFUE Pin Configuration
| Pin 1 | PTD0/TxD1 — GPIO / SCI1 transmit |
| Pin 2 | PTD1/RxD1 — GPIO / SCI1 receive |
| Pin 3 | PTD2/SPSCK1 — GPIO / SPI1 clock |
| Pin 4 | PTD3/MOSI1 — GPIO / SPI1 master-out-slave-in |
| Pin 5 | PTD4/MISO1 — GPIO / SPI1 master-in-slave-out |
| Pin 6 | PTD5/SS1 — GPIO / SPI1 slave-select |
| Pin 7 | PTD6 — GPIO |
| Pin 8 | PTD7 — GPIO |
| Pin 9 | VDD — Supply voltage 2.7-5.5V |
| Pin 10 | VSS — Ground |
| Pin 11 | PTA0 — GPIO / ADC channel |
| Pin 12 | PTA1 — GPIO / ADC channel |
| Pin 13 | PTA2 — GPIO / ADC channel |
| Pin 14 | PTA3 — GPIO / ADC channel |
| Pin 15 | PTA4 — GPIO / ADC channel |
| Pin 16 | PTA5 — GPIO / ADC channel |
| Pin 17 | PTA6 — GPIO / ADC channel |
| Pin 18 | PTA7 — GPIO / ADC channel |
| Pin 19 | PTB0 — GPIO |
| Pin 20 | PTB1 — GPIO |
| Pin 21 | PTB2 — GPIO |
| Pin 22 | PTB3 — GPIO |
| Pin 23 | PTB4 — GPIO |
| Pin 24 | PTB5 — GPIO |
| Pin 25 | PTB6 — GPIO |
| Pin 26 | PTB7 — GPIO |
| Pin 27 | PTC0 — GPIO |
| Pin 28 | PTC1 — GPIO |
| Pin 29 | PTC2 — GPIO |
| Pin 30 | PTC3 — GPIO |
| Pin 31 | PTC4 — GPIO |
| Pin 32 | PTC5 — GPIO |
| Pin 33 | PTC6 — GPIO |
| Pin 34 | PTC7 — GPIO |
| Pin 35 | PTE0/TxD2 — GPIO / SCI2 transmit |
| Pin 36 | PTE1/RxD2 — GPIO / SCI2 receive |
| Pin 37 | PTE2 — GPIO |
| Pin 38 | PTE3 — GPIO |
| Pin 39 | PTE4 — GPIO |
| Pin 40 | PTE5 — GPIO |
| Pin 41 | PTE6 — GPIO |
| Pin 42 | PTE7 — GPIO |
| Pin 43 | PTF0 — GPIO |
| Pin 44 | PTF1 — GPIO |
| Pin 45 | PTF2 — GPIO |
| Pin 46 | PTF3 — GPIO |
| Pin 47 | PTF4 — GPIO |
| Pin 48 | PTF5 — GPIO |
| Pin 49 | PTF6 — GPIO |
| Pin 50 | PTF7 — GPIO |
| Pin 51 | PTG0 — GPIO |
| Pin 52 | PTG1 — GPIO |
| Pin 53 | PTG2 — GPIO / SDA (IIC) |
| Pin 54 | PTG3 — GPIO / SCL (IIC) |
| Pin 55 | RESET — Reset input, active-low |
| Pin 56 | BKGD/MS — Background Debug Mode / Mode Select |
| Pin 57 | XTAL — Crystal oscillator output |
| Pin 58 | EXTAL — Crystal oscillator input or external clock |
| Pin 59 | VDD — Supply voltage 2.7-5.5V |
| Pin 60 | VSS — Ground |
| Pin 61 | NC — Not connected (per datasheet) |
| Pin 62 | NC — Not connected (per datasheet) |
| Pin 63 | NC — Not connected (per datasheet) |
| Pin 64 | NC — Not connected (per datasheet) |
Typical Applications
MC9S08AW32CFUE is suitable for 6 applications: Industrial Control Panels, Automotive Body and HVAC Modules, White Goods and Small Appliances, Security Alarm Panels, Sensor Hubs and Data Loggers, Low-Cost Consumer Devices.
Industrial Control Panels
The MC9S08AW32CFUE's 40 MHz S08 core, 32KB Flash, 54 GPIO and 2.7-5.5V supply make it well suited for industrial control panels that drive keypads, LED indicators and small LCD glass. Placed on the main logic board with a 3.3V LDO upstream, it scans an 8x8 matrix keypad at full CPU speed without DMA and refreshes a 4-mux TN LCD using its timer/PWM channels. Compared with a Cortex-M0 alternative, the S08 architecture delivers predictable interrupt latency and a simpler tool chain for long-life industrial products.
Recommended
Automotive Body and HVAC Modules
Automotive body controllers and HVAC modules use the MC9S08AW32CFUE's 8-channel 10-bit ADC for temperature/pressure sensing plus its two SCI ports for LIN communication with body controllers. The 64-QFP package gives enough GPIO for HVAC flap motors, blower control PWM and CAN-transceiver handshaking via SCI. Designers often pair the part with an automotive-grade S08AW variant such as the MC9S08AW32VFGE when an extended -40C to +105C range is mandatory.
Recommended
White Goods and Small Appliances
Washing machines, dishwashers, microwave ovens and induction cooktops use the MC9S08AW32CFUE because its 32KB Flash holds user-interface firmware plus sensor-conditioning code while the 10-bit ADC reads temperature, current and water-level sensors. The internal FLL tolerates a low-cost ceramic resonator, lowering BOM cost. The part's 2.7-5.5V supply lets it share a 5V rail with triac-driving optocouplers, simplifying the appliance's power architecture.
Recommended
Security Alarm Panels
Wired alarm panels benefit from the MC9S08AW32CFUE's up to 54 GPIO which can scan 16+ zones of wired sensors and drive a keypad plus piezo siren. The two SCI channels permit a backup modem link and a serial programming interface, while the IIC bus talks to a real-time clock and EEPROM for event logging. The HCS08 core's deterministic interrupt response ensures no missed sensor events even under keypad-scan loading.
Recommended
Sensor Hubs and Data Loggers
Multi-channel sensor hubs use the MC9S08AW32CFUE's 8-channel 10-bit ADC plus its SPI/IIC ports to aggregate temperature, humidity and pressure data from digital sensors, then forward packets over SCI or SPI to a host. The 32KB Flash holds calibration tables and a small FAT-style logger. The wide 2.7-5.5V supply means a single 3.3V coin-cell boost circuit is enough for portable data loggers.
Recommended
Low-Cost Consumer Devices
Toys, remote controls, educational electronics and small consumer gadgets leverage the MC9S08AW32CFUE because it delivers 32KB of Flash and 54 GPIO at a sub-$10 price point in volume. The 64-QFP footprint is friendly to two-layer hobby-grade PCBs, and the BDM debug port supports the $30 P&E USB-ML-USB multilink for cost-sensitive makers. The internal FLL removes the need for an external crystal in many consumer designs.
Recommended
Recommended Products Summary
Engineering reference data for MC9S08AW32CFUE — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MC9S08AW32CFUER | MC9S08AW32MFGE | MC9S08AW32VFGE | S9S08AW32E5MPUE | S9S08AW60E5MFGE |
|---|---|---|---|---|---|---|
| Package | 64-QFP (14x14 mm) | 64-QFP (14x14 mm) - same | 64-QFP (14x14 mm) - same | 64-QFP (14x14 mm) - same | 64-QFP (14x14 mm) - same | 64-QFP (14x14 mm) - same |
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Core | S08 / HCS08 8-bit | S08 / HCS08 8-bit | S08 / HCS08 8-bit | S08 / HCS08 8-bit | S08 / HCS08 8-bit | S08 / HCS08 8-bit |
| Flash | 32 KB | 32 KB | 32 KB | 32 KB | 32 KB | 60 KB (+87%) |
| RAM | 2 KB | 2 KB | 2 KB | 2 KB | 2 KB | 4 KB (+100%) |
| CPU Frequency | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz |
| Operating Voltage | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V |
| Temperature Grade | Industrial -40C to +85C | Industrial -40C to +85C | Automotive -40C to +125C | Automotive -40C to +105C | Automotive -40C to +125C | Automotive -40C to +125C |
| Lifecycle Status | NRND | NRND | Active | Active | Active | Active |
| Approx. Unit Price (1 pc) | $13.09 | ~$13.10 | ~$12.50 | ~$12.00 | ~$9.50 | ~$13.50 |
Key Differentiators
- Tape-and-reel packaging variant (vs MC9S08AW32CFUER)
- Industrial temperature grade only (vs MC9S08AW32MFGE)
- S9S08AW32 successor at lower price (vs S9S08AW32E5MPUE)
Design Notes
Place one 0.1 uF X7R ceramic decoupling capacitor as close as possible to every VDD pin (pins 9 and 59 on the 64-QFP). Add a bulk 10 uF tantalum or aluminum-polymer capacitor at the board supply entry. The S08AW core draws fast transient currents when peripherals enable; insufficient decoupling will cause code-fetch errors and unreliable ADC readings. Estimated: with 40 MHz core toggling 8 GPIO at 50% duty, dynamic current is ~25 mA.
Do not leave the RESET pin floating. A 10 kohm pull-up to VDD with a 100 nF capacitor to ground provides a clean power-on reset. The BKGD/MS pin must also be pulled high through 4.7 kohm during normal operation; otherwise the device may inadvertently enter active-background mode and freeze the user application. Always configure SOPT1 and SOPT2 registers before enabling peripherals like SCI or ADC.
At industrial temperature (-40C to +85C) the S08AW core typically dissipates under 200 mW, well within the 64-QFP thermal envelope. For automotive-temperature variants such as the MC9S08AW32MFGE, derate by 10-15% if all four ADC channels sample continuously at the maximum 8 us conversion rate. The QFP body (14x14 mm) provides enough copper pour for natural-convection cooling in most enclosures.
Compliance Information
RoHS and REACH compliant per NXP product environmental compliance. Industrial temperature grade (CFUE suffix) is not AEC-Q100 qualified; use MFGE or VFGE suffix parts for AEC-Q100 applications.