MC9S08AC16CFDE - 8-bit S08 MCU 16KB Flash 40MHz QFN-48 | NXP
MPN: MC9S08AC16CFDE ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.2 | $3.20 |
| 10 | $2.88 | $28.80 |
| 100 | $2.55 | $255.00 |
| 500 | $2.3 | $1,150.00 |
| 1,000 | $2.05 | $2,050.00 |
MC9S08AC16CFDE Overview
An 8-bit MCU is a single-chip computer whose CPU processes data 8 bits at a time. Within the embedded hierarchy, the MC9S08AC16CFDE belongs to the HCS08 family, a lineage of low-cost, high-performance 8-bit MCUs originally developed by Freescale Semiconductor (now part of NXP). MCUs of this class sit below 16-bit and 32-bit controllers in compute power but offer lower cost, simpler tooling, and strong EMC behavior, making them the workhorse of high-volume embedded control.
Key features include the 40 MHz S08 bus-capable CPU, in-circuit, in-application programmable Flash (16 KB), 4 KB of on-chip RAM for variables and stack, a 2.7 V to 5.5 V single-supply operating range, and 38 general-purpose I/O ports for button matrices, relay drives, and serial peripherals. The AC family is the third family in the Flexis series and is pin-compatible with 32-bit device duos, offering an upgrade path to ColdFire-class performance without a PCB redesign.
Architecturally, the S08 core uses CISC-style instructions with an enhanced stack pointer, background debug mode (BDM) via a single pin, and integrated system peripherals typical of the AC family including timers and ADC (per the manufacturer datasheet for detailed peripheral counts). The exposed-pad QFN package provides excellent thermal performance and low inductance for EMI-sensitive designs.
Typical applications include small appliance and home automation control, automotive body electronics, battery chargers and power supplies, and industrial sensor nodes where a 5 V tolerant, low-cost MCU is required.
When designing with this part, note the NXP product page lists the device as End of Life; plan a last-time-buy or select a drop-in family variant for new designs.
This page synthesizes verified distributor data, drop-in alternatives, lifecycle status, and practical design notes not found in the manufacturer datasheet.
Drop-in alternatives for MC9S08AC16CFDE — 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 MC9S08AC16CFDE (same form factor and footprint) — differing in Communication Interfaces, Package, RoHS Status, Lifecycle Status, Core Processor.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MC9S08AC8CFDE
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
MC9S08AC32CFDE
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$3.02 / Unit
View Datasheet →MC9S08AC48CFDE
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$4.76 / Unit
View Datasheet →MC9S08AC60CFDE
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$8.6 / Unit
View Datasheet →MC9S08AC16CFGE
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$2.6 / Unit
View Datasheet →MC9S08AC16CFDE Maximum Ratings & Electrical Characteristics
| Core Processor | S08 (HCS08) 8-bit CISC |
| Core Size | 8-Bit |
| Maximum Clock Frequency | 40 MHz |
| Flash Memory | 16 KB (16K x 8) |
| RAM Size | 4 KB |
| Supply Voltage Range | 2.7 V to 5.5 V |
| Number of I/O | 38 |
| Program Memory Type | Flash |
| Package Type | 48-QFN-EP (7x7 mm), HVQCCN |
| Mounting Type | Surface Mount |
| Series | S08AC (Flexis series) |
| Life Cycle Stage | End of Life (per NXP product page) |
| RoHS Status | RoHS Compliant |
| Package Pin Count | 48 |
| Packaging | Tray |
MC9S08AC16CFDE 48 Pin Configuration Guide
Pin configuration for MC9S08AC16CFDE (48 package). This digital IC includes GPIO, communication interfaces (UART, SPI, I2C), and power pins. Refer to the manufacturer datasheet for alternate pin functions and configuration options. Essential for embedded system design and PCB layout.
No detailed pinout data available for MC9S08AC16CFDE.
Refer to the datasheet for full pin configuration.
Typical Applications
MC9S08AC16CFDE is suitable for 6 applications: Home Appliance Control, Battery Chargers and Power Supplies, Automotive Body Electronics, Industrial Sensor Nodes and Monitoring, Lighting Control and LED Drivers, Legacy Maintenance and EOL Replacement.
Home Appliance Control
The MC9S08AC16CFDE fits appliance control boards - washing machines, rice cookers, fans, and small HVAC units - where its 38 general-purpose I/O lines drive relays, triacs, keys, and 7-segment displays directly at 5 V logic levels. The 2.7 V to 5.5 V supply range allows the MCU to run from a simple transformer or capacitive-dropper supply, and the 40 MHz S08 core handles keypad scanning and timer sequencing with large margins. The 48-QFN-EP (7x7 mm) exposed-pad package gives good thermal and EMI behavior on single-layer-heavy cost-driven boards. Its 16 KB Flash is sufficient for state-machine control plus fault diagnostics, and in-application Flash programming permits factory calibration data storage on the same die, removing an external EEPROM from the bill of materials.
Recommended
Battery Chargers and Power Supplies
In smart chargers and AC-DC power supply supervision, the MC9S08AC16CFDE provides the control loop intelligence: ADC sampling of voltage and current (per the AC family peripheral set - confirm channel count in the manufacturer datasheet), PWM generation for regulation, and serial communication for status reporting. The 5 V-tolerant I/O simplifies interfacing with op-amps and comparators running from the same rail, and the industrial temperature grade supports enclosed converter environments. The 16 KB Flash accommodates multi-chemistry charging algorithms (Li-ion, NiMH, lead-acid) with safety timers and fault logging. The exposed-pad QFN package dissipates the MCU's modest power easily, and BDM single-wire debugging lets engineers tune charge parameters on the bench without removing the device from the board.
Recommended
Automotive Body Electronics
S08AC-family devices have been widely used in automotive body functions such as seat control, mirror adjustment, lighting modules, and window lifters. The MC9S08AC16CFDE's 38 I/O lines handle switch matrices, relay and H-bridge commands, and LIN-type serial links; the 2.7 V to 5.5 V range tolerates automotive 5 V regulated rails with brown-out margin. The Flexis series positioning of the AC family gives suppliers a pin-compatible migration path to 32-bit performance when feature content grows, protecting PCB investment across vehicle programs. Designers should verify AEC qualification status of the specific suffix with NXP before use in safety-relevant positions, and apply standard load-dump protection on all inputs connected to vehicle harnesses.
Recommended
Industrial Sensor Nodes and Monitoring
For factory sensors, level switches, and condition-monitoring nodes, the MC9S08AC16CFDE combines ADC-based measurement, UART/SPI peripheral connectivity, and 16 KB of Flash for linearization tables and diagnostics. The industrial temperature grade (per Partstack listing) and 5 V operation match legacy 4-20 mA transmitter architectures and PLC I/O signaling directly. Its 40 MHz S08 core executes filtering and threshold logic well ahead of real-time requirements, while the low-power stop modes (see manufacturer datasheet for exact figures) extend battery life in wireless-attached variants. The exposed-pad QFN also improves noise immunity in electrically noisy motor-control cabinets, and the device's RoHS-compliant lead-free package keeps new industrial installations compliant with environmental directives.
Recommended
Lighting Control and LED Drivers
Dimmable LED luminaires, emergency-exit signs, and architectural lighting controllers use the MC9S08AC16CFDE for PWM generation, DALI/DMX-style serial decode, and human-interface control. Its 40 MHz bus operation produces fine-resolution PWM at flicker-free frequencies, and the 38 I/O lines drive button panels, presence-detector inputs, and multiple LED channels through external drivers. The 16 KB Flash stores dimming curves and self-test routines, and in-application programming enables field updates of lighting scenes. Because the MCU runs directly at 5 V, it interfaces cleanly with optocoupled DMX inputs and legacy 12 V aux rails via simple regulators. The compact 7x7 mm QFN fits into driver enclosures and track-head housings where PCB area is constrained.
Recommended
Legacy Maintenance and EOL Replacement
A substantial ongoing use of the MC9S08AC16CFDE is sustaining production of existing designs now that NXP has moved the part to End of Life. Manufacturers of meters, chargers, and appliance controls must either execute a last-time-buy or qualify a pin-compatible sibling - typically MC9S08AC32CFDE or MC9S08AC60CFDE, which use the identical 48-QFN-EP footprint and peripheral map. Authorized aftermarket sources such as Rochester Electronics supply the original MPN for legacy support, while XAIPART provides quote-based access to remaining stock as of 2026-10-18. When requalifying a family variant, firmware re-verification is limited to Flash/RAM linker settings, since pinout, electrical ratings, and debugging infrastructure are unchanged across the AC family.
Recommended
Recommended Products Summary
Engineering reference data for MC9S08AC16CFDE — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MC9S08AC8CFDE | MC9S08AC32CFDE | MC9S08AC60CFDE | MC9S08AC16CFGE |
|---|---|---|---|---|---|
| Package | 48-QFN-EP (7x7 mm) | 48-QFN-EP (7x7 mm) - same | 48-QFN-EP (7x7 mm) - same | 48-QFN-EP (7x7 mm) - same | 48-QFN-EP (7x7 mm) - same |
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Core / Clock | S08 8-bit, 40 MHz | S08 8-bit, 40 MHz | S08 8-bit, 40 MHz | S08 8-bit, 40 MHz | S08 8-bit, 40 MHz |
| Flash Memory | 16 KB | 8 KB | 32 KB | 60 KB | 16 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 |
| I/O Count | 38 | 38 | 38 | 38 | 38 |
| Lifecycle Status | End of Life (NXP) | Aged family - verify on NXP page | Aged family - verify on NXP page | Aged family - verify on NXP page | Aged family - verify on NXP page |
Key Differentiators
- Balanced 16 KB Flash / 4 KB RAM point in the AC family (vs MC9S08AC8CFDE)
- Lower cost than higher-memory siblings for compact firmware (vs MC9S08AC32CFDE)
- Flexis-series pin-compatible upgrade path to 32-bit (vs MC9S08AC60CFDE)
Design Notes
This part is End of Life per the NXP product page. Before committing a new or continuing design, verify remaining stock life with your distributor and pre-qualify a same-footprint sibling (MC9S08AC32CFDE or MC9S08AC60CFDE) as a contingency. These family variants are pin-to-pin and peripheral-map compatible, so second-sourcing within the AC family requires only linker/memory-map changes in firmware, not a PCB respin.
The 2.7 V to 5.5 V supply range permits direct 5 V or 3.3 V operation, but brown-out behavior differs across the range. Place a 100 nF ceramic capacitor at each VDD/VSS pin pair plus bulk 10 uF at the regulator output. If the design must survive automotive load-dump events on an unprotected rail, add series resistance and a TVS diode ahead of the local regulator - never rely on the MCU's internal protection.
The exposed pad of the 48-QFN-EP package should be soldered to a grounded copper pour for mechanical reliability and EMC performance; a thermal-relief-free via array (3x3 minimum) to the ground plane is standard practice for QFN-EP devices. Keep the BDM debug pad accessible on a test point even in production layouts - single-wire background debugging is the only flashing method without removing the device.
Compliance Information
RoHS compliant per distributor/datasheet aggregator listings (QFN-48 lead-free package). REACH, halogen-free, and conflict-minerals status not stated in provided data - request declaration from NXP.
