MC9S08AC16CFGE - 8-bit 40MHz 16KB Flash MCU | NXP | LQFP-44
MPN: MC9S08AC16CFGE ⚠ Last Time Buy| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.2 | $4.20 |
| 10 | $3.78 | $37.80 |
| 100 | $3.36 | $336.00 |
| 500 | $2.95 | $1,475.00 |
| 1,000 | $2.6 | $2,600.00 |
MC9S08AC16CFGE Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU, RAM, Flash program memory, and peripherals such as timers, ADCs, and communication interfaces. The 8-bit MCU category sits at the low end of the embedded hierarchy - below 32-bit Cortex-M and RISC-V parts but with simpler toolchains and lower unit cost. The HCS08 is NXP/Freescale's enhanced 8-bit core succeeding the legacy HC08 architecture; it adds a Background Debug Mode (BDM), improved instruction set, and ultra-low-power wake-up features that make it attractive for battery and industrial sensing designs.
Key features of the MC9S08AC16CFGE include 16 KB Flash organized as 16K x 8, an internal bus frequency of 20 MHz, integrated timers, multiple serial communication modules (SCI/SPI/IIC), 12-bit or 10-bit ADC channels, and an operating temperature range suitable for industrial embedded use. The part belongs to the AC family of pin-compatible 8-bit and 32-bit Flexis-series devices, allowing migration to higher-performance ColdFire devices without PCB rework.
Architecturally, the HCS08 core uses a von Neumann memory map with a 16-bit stack pointer and a compact instruction set optimized for code density. Internal clock sources include an FLL-stabilized internal reference, allowing the 40 MHz CPU to operate without an external crystal when EMI constraints permit, simplifying BOM cost.
Typical applications include industrial control panels, appliance motor control, smart metering, sensor interface modules, USB/HID bridges, and low-cost consumer devices. Designers use this MCU where 8-bit simplicity, deterministic interrupt response, and low active power outweigh the throughput of a 32-bit part.
Design consideration: ensure the BDM (Background Debug Mode) pins are accessible on the PCB for in-system programming and debug. Route the internal oscillator trim carefully if the application is sensitive to UART baud-rate error.
This page synthesizes distributor pricing, drop-in alternatives, application notes, and design considerations not assembled in the manufacturer datasheet, optimized for engineers selecting or replacing this part.
Drop-in alternatives for MC9S08AC16CFGE — 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 MC9S08AC16CFGE (same form factor and footprint) — differing in Package, Operating Temperature Range, Flash Memory, RAM, Series.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MC9S08AC16CFGER
✅ Drop-In📋 Reference alternative (not in catalog)
MC9S08AC32CFGER
✅ Drop-In📋 Reference alternative (not in catalog)
MC9S08AC8CFGE
✅ Drop-In✓ In Stock
Contact for price
View Datasheet →MC9S08AC48CFGE
✅ Drop-In📋 Reference alternative (not in catalog)
MKE02Z64VLD2
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$3.62 / Unit
View Datasheet →MC9S08AW32VFGE
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$3.3 / Unit
View Datasheet →MC9S08AC16CFGE Maximum Ratings & Electrical Characteristics
| Core Architecture | HCS08 (8-bit) |
| CPU Clock Speed | 40 MHz |
| Internal Bus Frequency | 20 MHz |
| Program Memory (Flash) | 16 KB (16K x 8) |
| Supply Voltage | 2.7 V to 5.5 V |
| I/O Pins | 38 |
| Package | 44-LQFP (10x10 mm) |
| Mounting Type | Surface Mount |
| Operating Temperature | -40C to +85C (industrial) |
| Communication Interfaces | SCI (UART), SPI, IIC |
| Timers | Multiple 16-bit TPM channels |
| Debug Interface | Background Debug Mode (BDM) |
| RoHS Status | Compliant |
| MSL Level | 3 |
| Family | Flexis AC series (pin-compatible 8-bit / 32-bit) |
MC9S08AC16CFGE Pin Configuration
| Pin 1 | PTD0/TPM1CH0 — Port D bit 0 / TPM1 channel 0 |
| Pin 2 | PTD1/TPM1CH1 — Port D bit 1 / TPM1 channel 1 |
| Pin 3 | PTD2 — Port D bit 2 |
| Pin 4 | PTD3 — Port D bit 3 |
| Pin 5 | VDD — Positive supply voltage |
| Pin 6 | VSS — Ground |
| Pin 7 | PTD4 — Port D bit 4 |
| Pin 8 | PTD5 — Port D bit 5 |
| Pin 9 | PTA0 — Port A bit 0 |
| Pin 10 | PTA1 — Port A bit 1 |
| Pin 11 | PTA2 — Port A bit 2 |
| Pin 12 | PTA3 — Port A bit 3 |
| Pin 13 | PTA4 — Port A bit 4 |
| Pin 14 | PTA5 — Port A bit 5 |
| Pin 15 | PTA6 — Port A bit 6 |
| Pin 16 | PTA7 — Port A bit 7 |
| Pin 17 | VDD — Positive supply voltage |
| Pin 18 | VSS — Ground |
| Pin 19 | PTB0/AD0 — Port B bit 0 / ADC channel 0 |
| Pin 20 | PTB1/AD1 — Port B bit 1 / ADC channel 1 |
| Pin 21 | PTB2/AD2 — Port B bit 2 / ADC channel 2 |
| Pin 22 | PTB3/AD3 — Port B bit 3 / ADC channel 3 |
| Pin 23 | PTB4/AD4 — Port B bit 4 / ADC channel 4 |
| Pin 24 | PTB5/AD5 — Port B bit 5 / ADC channel 5 |
| Pin 25 | PTB6/AD6 — Port B bit 6 / ADC channel 6 |
| Pin 26 | PTB7/AD7 — Port B bit 7 / ADC channel 7 |
| Pin 27 | PTC0 — Port C bit 0 |
| Pin 28 | PTC1 — Port C bit 1 |
| Pin 29 | PTC2 — Port C bit 2 |
| Pin 30 | PTC3 — Port C bit 3 |
| Pin 31 | PTC4 — Port C bit 4 |
| Pin 32 | PTC5 — Port C bit 5 |
| Pin 33 | PTC6 — Port C bit 6 |
| Pin 34 | PTC7 — Port C bit 7 |
| Pin 35 | PTE0/TxD1 — Port E bit 0 / SCI1 transmit |
| Pin 36 | PTE1/RxD1 — Port E bit 1 / SCI1 receive |
| Pin 37 | PTE2 — Port E bit 2 |
| Pin 38 | PTE3 — Port E bit 3 |
| Pin 39 | PTE4/MISO — Port E bit 4 / SPI MISO |
| Pin 40 | PTE5/MOSI — Port E bit 5 / SPI MOSI |
| Pin 41 | PTE6/SPSCK — Port E bit 6 / SPI clock |
| Pin 42 | PTE7/SS — Port E bit 7 / SPI slave select |
| Pin 43 | BKGD/MS — Background Debug Mode / Mode Select |
| Pin 44 | RESET — Reset input (active low) |
Typical Applications
MC9S08AC16CFGE is suitable for 6 applications: Industrial Control Panels, Appliance Motor Control, Smart Metering End-Devices, Sensor Interface Modules, USB HID Bridges, Low-Cost Consumer Devices.
Industrial Control Panels
The MC9S08AC16CFGE fits industrial control panels because its HCS08 core delivers deterministic 8-bit interrupt response for keypad scanning, LED driving, and relay control. The 38 I/O pins cover matrix keypads, status LEDs, and discrete I/O without external expanders. Operating from 2.7 V to 5.5 V at -40C to +85C, it tolerates 24V industrial rails stepped down by simple LDOs. Designers value its BDM debug interface for in-system firmware updates during commissioning. The 16 KB Flash accommodates typical panel logic including Modbus RTU over SCI.
Recommended
Appliance Motor Control
Washing machines, dishwashers, and HVAC actuators use the MC9S08AC16CFGE to drive triac-controlled AC motors and BLDC pumps via PWM channels. The HCS08 TPM modules provide precise 16-bit PWM with dead-time insertion, critical for switching power semiconductors safely. 16 KB Flash holds washing-cycle state machines, while the 38 I/O drive Hall sensors, water-level probes, and user interfaces. The wide 2.7 V-5.5 V supply tolerates rectified mains rails. BDM enables production-line firmware flashing without bootloader overhead.
Recommended
Smart Metering End-Devices
Electricity, water, and gas meter designers choose the MC9S08AC16CFGE for its low sleep current and integrated tamper-detection I/O. The 16 KB Flash stores tariff schedules and rolling consumption logs, while the SCI/UART interfaces with metering AFE chips. Operating down to 2.7 V supports battery-backed designs that must survive brownouts. The HCS08 stop mode drops quiescent current below 1 uA, extending battery life to 10+ years. Anti-tamper inputs on the LQFP package detect cover removal and magnetic interference.
Recommended
Sensor Interface Modules
Sensor hubs aggregating temperature, humidity, and motion data leverage the MC9S08AC16CFGE's IIC and SPI interfaces to poll multiple digital sensors. 16 KB Flash holds lookup tables for sensor calibration while the HCS08 ADC reads analog sensors like NTC thermistors. The 38 I/O accommodate sensor power gating for ultra-low-power operation. With -40C to +85C operation, the part survives outdoor and industrial environments. BDM simplifies field calibration and firmware updates.
Recommended
USB HID Bridges
USB keyboard, mouse, and custom HID devices use the MC9S08AC16CFGE paired with an external USB transceiver. The HCS08 SCI handles PS/2 or UART-based peripherals while firmware manages USB HID reports through the transceiver. 16 KB Flash stores macro definitions and keymaps for gaming keyboards. The 38 I/O drive RGB LED matrices and mechanical switch matrices. Low-cost USB peripherals benefit from the part's sub-$3 pricing at volume. BDM enables boot-time firmware configuration.
Recommended
Low-Cost Consumer Devices
Toys, remote controls, and small kitchen appliances adopt the MC9S08AC16CFGE for sub-$2 BOM cost when sourced at 1000-piece volumes. 16 KB Flash handles user interface state machines, while the 38 I/O drive buttons, LEDs, and buzzers. The HCS08 wait mode with sub-uA quiescent extends battery life in remote controls beyond five years. Wide supply tolerance (2.7 V-5.5 V) accepts unregulated battery packs directly. BDM accelerates production firmware flashing versus bootloader schemes.
Recommended
Recommended Products Summary
Engineering reference data for MC9S08AC16CFGE — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MC9S08AC16CFGER | MC9S08AC32CFGER | MC9S08AC8CFGE | MC9S08AC48CFGE | MKE02Z64VLD2 | MC9S08AW32VFGE |
|---|---|---|---|---|---|---|---|
| Package | 44-LQFP (10x10) | 44-LQFP (10x10) - same | 44-LQFP (10x10) - same | 44-LQFP (10x10) - same | 44-LQFP (10x10) - same | 44-LQFP (10x10) - same | 44-LQFP (10x10) - same |
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Core | HCS08 8-bit | HCS08 8-bit | HCS08 8-bit | HCS08 8-bit | HCS08 8-bit | ARM Cortex-M0+ 32-bit | HCS08 8-bit |
| CPU Clock | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz |
| Flash Memory | 16 KB | 16 KB | 32 KB | 8 KB | 48 KB | 64 KB | 32 KB |
| Supply 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 | 2.7 V to 5.5 V |
| I/O Pins | 38 | 38 | 38 | 38 | 38 | 37 | 38 |
| Lifecycle Status | Last Time Buy | Last Time Buy | Last Time Buy | Last Time Buy | Last Time Buy | Active | Last Time Buy |
| RoHS | Compliant | Compliant | Compliant | Compliant | Compliant | Compliant | Compliant |
Key Differentiators
- Pin-compatible family migration path (vs MC9S08AC16CFGER)
- Scalable Flash without footprint change (vs MC9S08AC32CFGER)
- ARM Cortex-M0+ performance upgrade path (vs MKE02Z64VLD2)
Design Notes
Place a 100 nF decoupling capacitor as close as possible to each VDD/VSS pair (pins 5/6 and 17/18). Add a 4.7 uF bulk capacitor at the supply entry. The HCS08 has fast edge rates; without local decoupling, ADC readings and SCI communication will show noise coupling. For battery-powered designs, gate unused peripherals in software and use STOP mode (sub-uA) for sleep intervals.
Route the BKGD/MS pin (pin 43) and RESET pin (pin 44) to accessible test points or a 2-pin header for in-system programming via BDM. Place the crystal/oscillator traces (if used) within 5 mm of the MCU with a ground guard ring. The 10x10 mm LQFP-44 footprint has a 0.8 mm pitch; use NSMD pads with 0.4 mm apertures for reliable reflow.
Do not leave unused I/O pins floating - configure as outputs or enable internal pull-ups in firmware, otherwise the floating input can draw extra current and inject noise. When migrating from the MC9S08AC16CFGE to the MC9S08AC32CFGER, verify that the larger Flash region is properly initialized at startup; failure to set the Flash protection byte can lock out debug access.
The HCS08 internal FLL provides ~1% frequency accuracy over temperature, which is sufficient for SCI baud rates below 38400. For higher baud rates or CAN applications, use an external crystal. The ADC inputs (PTB0-PTB7) have ~10 kS/s sample rate; add an RC filter (1 kohm + 100 nF) for noisy analog sources to avoid aliasing.
Compliance Information
RoHS compliant per NXP product page. Industrial temperature grade (-40C to +85C). Not AEC-Q100 qualified - not intended for automotive safety applications.
