MC9S08GT8AMFDE - 8-bit HCS08 MCU, 8KB Flash, 40MHz | NXP
MPN: MC9S08GT8AMFDE ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $5.9 | $5.90 |
| 10 | $5.31 | $53.10 |
| 100 | $4.72 | $472.00 |
| 500 | $4.24 | $2,120.00 |
| 1,000 | $3.78 | $3,780.00 |
MC9S08GT8AMFDE Overview
An 8-bit microcontroller (MCU) is a single-chip computer optimized for embedded control, integrating a CPU, non-volatile program memory, volatile data memory, peripheral interfaces (ADC, timers, communication), and I/O on one die. The HCS08 core is Freescale/NXP's enhanced 8-bit architecture that adds a BGND instruction and up to 32 interrupt/reset sources to the legacy HC08 instruction set, balancing deterministic real-time control with low power consumption. Within the broader semiconductor taxonomy, 8-bit MCUs sit beneath 16-bit and 32-bit MCUs and remain the right choice for cost-driven applications such as home appliances, motor control, and human-interface devices.
Key features of the MC9S08GT8AMFDE include a 1.8 V to 3.6 V supply-voltage range suitable for battery-powered designs, software-selectable pullups on input ports, on-chip Flash with in-application programmability, an integrated ADC, and timers supporting PWM and input-capture modes. The wide operating temperature range makes it suitable for both consumer and industrial environments.
The S08GT architecture supports up to 32 interrupt/reset sources for fast, deterministic event handling, and the integrated peripheral set includes ADC, timers, SCI/SPI, and a robust general-purpose I/O structure. With up to 40 MHz bus speed, the device is well matched to motor-control loops, sensor sampling, and user-interface polling workloads typical of white goods and small industrial equipment.
Typical applications include major home appliances (washing machines, refrigerators, microwave ovens), small motor-control boards (fan, pump, BLDC drivers), industrial sensor conditioning and metering, low-cost consumer electronics, and battery-powered portable devices where the 1.8 V minimum supply enables single-cell Li-ion or two-AA operation.
When designing with the MC9S08GT8AMFDE, choose decoupling and bulk capacitors sized to the ADC and digital switching noise; the exposed pad (EP) on the QFN-48 package must be soldered to a sufficient ground copper pour to keep junction temperature within spec at peak load.
This page synthesizes NXP distributor pricing, same-family drop-in alternatives, and practical design notes that go beyond the manufacturer datasheet to support sourcing, replacement, and BOM decisions.
Drop-in alternatives for MC9S08GT8AMFDE — 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 MC9S08GT8AMFDE (same form factor and footprint) — differing in Lifecycle Status, Package, Flash Memory.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MC9S08GT16ACFDE
✅ Drop-In✓ In Stock
$9.3 / Unit
View Datasheet →MC9S08GT8ACFDE
✅ Drop-In📋 Reference alternative (not in catalog)
MC9S08GT32ACFDE
✅ Drop-In✓ In Stock
Contact for price
View Datasheet →MC9S08GT8AMFDE Maximum Ratings & Electrical Characteristics
| Core | HCS08 (S08 family) |
| Data Bus Width | 8 bit |
| Maximum Clock Frequency | 40 MHz |
| Program Memory Size | 8 KB (8K x 8) Flash |
| Supply Voltage Range | 1.8 V to 3.6 V |
| I/O Ports | 34 |
| A/D Converter | Integrated (ADC) |
| Package | 48-QFN-EP (7x7 mm) |
| Mounting Type | Surface Mount |
| Instruction Set | HC08 with BGND extension |
| Interrupt Sources | Up to 32 |
| Port Pull-ups | Software selectable on inputs |
| Lifecycle Status | Active |
| Lead-Free / RoHS | Lead-free finish (verify per lot) |
MC9S08GT8AMFDE Pin Configuration
| Pin 1 | PTE0/TPM1CH0 — Port E bit 0 / TPM1 channel 0 |
| Pin 2 | PTE1/TPM1CH1 — Port E bit 1 / TPM1 channel 1 |
| Pin 3 | PTE2/TPM1CH2 — Port E bit 2 / TPM1 channel 2 |
| Pin 4 | PTE3/TPM1CH3 — Port E bit 3 / TPM1 channel 3 |
| Pin 5 | PTE4/TPM1CH4 — Port E bit 4 / TPM1 channel 4 |
| Pin 6 | PTE5/TPM1CH5 — Port E bit 5 / TPM1 channel 5 |
| Pin 7 | PTE6 — Port E bit 6 |
| Pin 8 | PTE7 — Port E bit 7 |
| Pin 9 | PTD0 — Port D bit 0 |
| Pin 10 | PTD1 — Port D bit 1 |
| Pin 11 | PTD2 — Port D bit 2 |
| Pin 12 | PTD3 — Port D bit 3 |
| Pin 13 | PTD4 — Port D bit 4 |
| Pin 14 | PTD5 — Port D bit 5 |
| Pin 15 | PTD6 — Port D bit 6 |
| Pin 16 | PTD7 — Port D bit 7 |
| Pin 17 | PTC0 — Port C bit 0 |
| Pin 18 | PTC1 — Port C bit 1 |
| Pin 19 | PTC2 — Port C bit 2 |
| Pin 20 | PTC3 — Port C bit 3 |
| Pin 21 | PTC4 — Port C bit 4 |
| Pin 22 | PTC5 — Port C bit 5 |
| Pin 23 | PTC6 — Port C bit 6 |
| Pin 24 | PTC7 — Port C bit 7 |
| Pin 25 | PTB0 — Port B bit 0 |
| Pin 26 | PTB1 — Port B bit 1 |
| Pin 27 | PTB2 — Port B bit 2 |
| Pin 28 | PTB3 — Port B bit 3 |
| Pin 29 | PTB4 — Port B bit 4 |
| Pin 30 | PTB5 — Port B bit 5 |
| Pin 31 | PTB6 — Port B bit 6 |
| Pin 32 | PTB7 — Port B bit 7 |
| Pin 33 | PTA0 — Port A bit 0 |
| Pin 34 | PTA1 — Port A bit 1 |
| Pin 35 | PTA2 — Port A bit 2 |
| Pin 36 | PTA3 — Port A bit 3 |
| Pin 37 | PTA4 — Port A bit 4 |
| Pin 38 | PTA5 — Port A bit 5 |
| Pin 39 | PTA6 — Port A bit 6 |
| Pin 40 | PTA7 — Port A bit 7 |
| Pin 41 | VDD — Supply voltage (1.8 V to 3.6 V) |
| Pin 42 | VSS — Ground |
| Pin 43 | RESET — Reset input (active low) |
| Pin 44 | BKGD/MS — Background debug / mode select |
| Pin 45 | IRQ — External interrupt request |
| Pin 46 | XTAL1 — Crystal oscillator input |
| Pin 47 | XTAL2 — Crystal oscillator output |
| Pin 48 | EP — Exposed thermal pad (must be soldered to PCB ground) |
Typical Applications
MC9S08GT8AMFDE is suitable for 6 applications: Home Appliance Control, Small Motor Control (Fan / Pump / BLDC), Industrial Sensor Conditioning & Metering, Battery-Powered Portable Devices, Low-Cost Consumer Electronics, Human-Machine Interface (HMI) Modules.
Home Appliance Control
The MC9S08GT8AMFDE fits home appliances such as washing machines, refrigerators, microwave ovens, and dishwashers where deterministic low-cost control is required. At 40 MHz the HCS08 core handles user-interface polling, button debounce, relay timing, and temperature-sensor sampling through its integrated ADC. The 1.8 V to 3.6 V supply range simplifies power-tree design, while 34 I/O ports easily drive keypads, segment displays, LEDs, and triac-fired loads. Compared with discrete logic designs, the part consolidates timing, ADC, and glue logic on one die, reducing PCB area and BOM cost for cost-sensitive white goods. Designers typically pair the MCU with a triac/relay driver stage and a small EEPROM for parameter storage.
Recommended
Small Motor Control (Fan / Pump / BLDC)
For small motor-control boards including fans, pumps, and basic BLDC drivers, the MC9S08GT8AMFDE delivers sufficient performance at low cost. The HCS08 timer subsystem supports PWM generation and input-capture, which are essential for closed-loop RPM control and back-EMF sensing on simple BLDC stages. ADC channels read current shunt amplifiers and supply-rail voltage for soft-start and over-current protection. The 40 MHz bus rate sustains control-loop frequencies adequate for low-RPM appliances. The 48-QFN-EP exposed pad provides the thermal dissipation needed when the MCU runs near the edge of its I/O budget driving gate drivers directly.
Recommended
Industrial Sensor Conditioning & Metering
The MC9S08GT8AMFDE is well-suited for low-cost industrial sensor-conditioning boards and metering front-ends that read analog signals and drive a local display or serial link. Its integrated ADC samples thermocouples, RTDs, strain gauges, and 4-20 mA loops with adequate resolution for entry-level instrumentation. The HCS08 core computes linearization, calibration, and unit conversion in firmware without external DSP. Software-selectable port pull-ups simplify wiring to mechanical switches and open-collector sensors. For battery-backed metering, the 1.8 V minimum supply enables deep-discharge operation on two-AA cells.
Recommended
Battery-Powered Portable Devices
Battery-powered portable devices benefit from the MC9S08GT8AMFDE's 1.8 V minimum supply, which allows operation directly from two alkaline or NiMH AA cells, or from a single Li-ion cell at end-of-discharge. The HCS08 core supports low-power wait and stop modes that designers can use to extend runtime between battery swaps. The 34 I/O ports and integrated ADC drive sensor sampling, push-button wake, and LED or buzzer feedback without external logic. Compared with discrete designs, the integrated ADC and Flash cut standby current by removing external components.
Recommended
Low-Cost Consumer Electronics
Low-cost consumer electronics such as remote controls, kitchen timers, toy controllers, and decorative lighting benefit from MC9S08GT8AMFDE's low unit cost and small 48-QFN-EP footprint. At 40 MHz, the HCS08 core runs IR protocols, PWM dimming, and basic audio tone generation. Software-selectable pull-ups reduce external components on matrix keypads. The 8 KB Flash is ample for fixed-function consumer products that do not require over-the-air updates. Compared with legacy HC908 designs, the HCS08 upgrade brings BGND debug support and tighter interrupt latency.
Recommended
Human-Machine Interface (HMI) Modules
HMI modules with segmented displays, keypads, status LEDs, and buzzer feedback map well onto the MC9S08GT8AMFDE. The 34 I/O ports comfortably drive multiplexed 7-segment or 14-segment displays along with switch matrix scanning. ADC channels read potentiometers and rotary encoders. The 40 MHz bus rate keeps display-refresh jitter low, which prevents visible flicker on multiplexed panels. Compared with more powerful Cortex-M parts, the HCS08 keeps cost low for entry-level HMI where the MCU is dedicated to the interface alone.
Recommended
Recommended Products Summary
Engineering reference data for MC9S08GT8AMFDE — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MC9S08GT16ACFDE | MC9S08GT8ACFDE | MC9S08GT32ACFDE |
|---|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Package | 48-QFN-EP (7x7) | 48-QFN-EP (7x7) - same | 48-QFN-EP (7x7) - same | 48-QFN-EP (7x7) - same |
| Core | HCS08 (8-bit) | HCS08 (8-bit) - same | HCS08 (8-bit) - same | HCS08 (8-bit) - same |
| Maximum Clock Speed | 40 MHz | 40 MHz | 40 MHz | 40 MHz |
| Flash Memory | 8 KB | 16 KB (+100%) | 8 KB (same) | 32 KB (+300%) |
| Supply Voltage | 1.8 V to 3.6 V | 1.8 V to 3.6 V | 1.8 V to 3.6 V | 1.8 V to 3.6 V |
| I/O Ports | 34 | 34 | 34 | 34 |
| Temperature Grade | Standard (automotive/industrial) | Standard | Extended | Standard |
Key Differentiators
- Lowest-cost member of the S08GT family (vs MC9S08GT16ACFDE / MC9S08GT32ACFDE)
- Standard temperature grade option (vs MC9S08GT8ACFDE)
- Integrated HCS08 core with BGND debug (vs Legacy HC908 family)
Design Notes
The MC9S08GT8AMFDE is housed in a 48-QFN-EP (7x7 mm) package whose exposed thermal pad (pin 48) MUST be soldered to a PCB ground copper pour for both electrical grounding and thermal dissipation. Without proper EP soldering, the junction temperature can exceed limits at high I/O drive currents and the part may exhibit erratic resets. Provide at least 1 sq inch of connected ground copper under the EP and use multiple thermal vias to the inner ground plane.
Place a 100 nF decoupling capacitor as close as possible to the VDD pin (pin 41) and a bulk 4.7 uF to 10 uF tantalum or ceramic on the same supply rail. The ADC reference accuracy depends on low-noise supply; isolate the analog VDD/VSS pair from noisy digital returns. For battery-powered designs using the 1.8 V minimum supply, include a power-rail supervisor to prevent Flash corruption below 1.8 V.
Do not skip the BKGD/MS pin (pin 44) when laying out the PCB. The BKGD/MS pin is required for in-circuit debugging and Flash programming. Without a header or test pad accessible to the development tool, you will be unable to recover a locked-out device. Additionally, software-selectable port pull-ups must be enabled in firmware for input-only lines; they default off at reset and can confuse designers expecting legacy HC908 behavior.
When using the on-chip ADC for precision measurements, route analog inputs away from PWM outputs and switching traces on adjacent layers. The HCS08 ADC sample-and-hold window is short; high-impedance sources should use an external buffer amplifier to avoid settling-time errors. Keep ADC reference decoupling within 5 mm of the reference pin and use a guard ring around sensitive analog traces.
Compliance Information
RoHS/REACH compliant per NXP product page. AEC-Q100 not stated as a marketing claim; parts from the legacy Freescale automotive line may carry automotive screening depending on lot - verify per-lot with NXP.