The MC908QY4ACDWE is an 8-bit microcontroller from the HC08Q series by NXP (formerly Freescale), positioned for cost-sensitive, space-constrained general-purpose control applications. Although this device has entered the end-of-life phase (Obsolete / Last Time Buy), it remains relevant for maintenance, legacy system replacements, and cost-driven volume products.
Product Overview
The MC908QY4ACDWE belongs to the enhanced HC08 microcontroller family, based on the M68HC08 CISC architecture (Von Neumann structure). It integrates on-chip Flash memory and SRAM, along with fundamental peripherals such as ADC, timers, and PWM. This device is suitable for simple embedded controllers, sensor interfaces, basic motor drivers, and low-throughput IoT edge nodes.
It is available in a 16-pin SOIC package (7.50 mm width, 1.27 mm pitch) and operates over a wide voltage range with an industrial temperature rating.
Key Specifications
Parameter | Specification |
Core Architecture | HC08Q Family, 8-bit CISC core |
Flash Memory | 4 KB |
SRAM | 128 bytes (128 × 8-bit) |
Max Clock Frequency | 8 MHz |
ADC | 6-channel, 10-bit resolution |
GPIO Count | 13 I/O pins |
Timer/PWM | 16-bit timer, 2 channels (IC/OC/PWM) |
Operating Voltage | 2.7 V – 5.5 V |
Temperature Range | –40°C to +85°C (industrial grade) |
Serial Interface | SCI UART (asynchronous) |
Package Type | SOIC-16 (Surface-mount) |
Lifecycle Status | Obsolete / Last Time Buy |
Application Advantages and Suitability
Strengths
- Cost-effective resource set:Though limited in memory and speed, it’s sufficient for basic use cases like sensor acquisition, user interface control, and low-power actuation.
- Wide operating voltage:Supports 2.7 V to 5.5 V, compatible with various power rails.
- Industrial temperature grade:Suitable for moderately demanding environments.
- Essential peripherals:Equipped with ADC, timers/PWM, and SCI for basic embedded control.
Limitations
- Small memory size:Unsuitable for complex algorithms, high variable count, or graphical interfaces.
- Low processing speed:8 MHz max clock limits sampling rates and PWM resolution.
- Obsolete status:Long-term availability and support risk for new designs.
- Peripheral constraints:Limited I/O and peripheral expansion due to small pin count.
Lifecycle Status and Replacement Considerations
Per official documentation, MC908QY4ACDWE is marked as Obsolete / Last Time Buy.
For new projects or long-term support planning, consider the following replacement strategies:
Replacement Approach | Recommended Features |
Same-tier 8-bit MCUs | ≥4 KB Flash, ≥10-bit ADC, 3–5.5 V supply range |
Performance upgrade | Higher frequency (≥16 MHz), more GPIOs, better peripherals |
Modern architecture | ARM Cortex-M based MCUs for ecosystem support and longevity |
Typical Application Scenarios
Application Domain | Use Case Examples |
Instrumentation & Control Panels | LED indicators, button inputs, simple displays |
Consumer/Home Appliances | Basic fan control, thermostats, timers |
Educational/Training Boards | MCU programming and peripheral labs |
Legacy System Maintenance | HC08-based board replacement or firmware patching |
Design and Integration Notes
- Clock & frequency:8 MHz clock is suitable for basic control but should be evaluated for latency-sensitive ADC/PWM applications.
- Power supply:Ensure clean and stable supply between 2.7–5.5 V to reduce clock and ADC noise errors.
- Pin usage planning: SOIC-16 package offers limited I/O; careful mapping of shared pins is critical for compact designs.
- Environmental protection: For industrial deployment, apply measures against thermal drift, vibration, and humidity. Use thermal pads or temperature sensors if needed.
The MC908QY4ACDWE is a low-cost, resource-conscious 8-bit MCU within the HC08Q family, well-suited for applications that demand simple analog input handling and basic I/O control. While it offers flexibility in low-complexity designs, its end-of-life status requires caution for new developments, and engineers are advised to plan migration paths or drop-in replacements to ensure design continuity.
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