MC9S08QG4CFQE - 20MHz 8-Bit MCU | NXP | Embedded Control
MPN: MC9S08QG4CFQE ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.6708 | $0.67 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
MC9S08QG4CFQE Overview
A microcontroller is a programmable semiconductor that integrates a CPU, memory and peripherals on one die. The MC9S08QG4CFQE belongs to the S08QG family of 8-bit flash MCUs, a practical choice when a product needs deterministic control, modest program storage and low peripheral overhead rather than a high-performance processor. The S08 architecture uses a compact instruction set suited to appliance controls, portable products and small automation nodes.
Verified product information identifies a 20 MHz clock, 4 KB Flash memory, six I/O ports and a 1.8 V to 3.6 V operating supply. The HCS08 core includes background debugging and breakpoint support, while the S08QG family is described as suitable for battery-powered devices. These features let designers integrate firmware development and hardware diagnostics without relying on a larger external system.
The device's 4 mm by 4 mm 8-DFN-EP package helps minimize PCB area, but the exposed pad requires deliberate thermal and layout treatment. Because this MCU combines low-voltage operation, limited I/O and modest Flash capacity, design decisions should center on workload fit, pin multiplexing and power budgeting. The 20 MHz CPU provides useful timing headroom for small control loops, serial communication and peripheral servicing.
Typical uses include battery-powered sensor nodes, compact appliance controls, simple motor-control front ends, low-cost embedded modules and small industrial control boards. It is best suited to designs whose firmware fits within 4 KB and whose external interfaces can be implemented through the available six I/O ports. The low operating voltage also makes system-level supply and sleep-current decisions especially important.
For a robust layout, connect the exposed pad to the appropriate ground plane, place decoupling close to the supply pins and verify signal integrity on external buses. Firmware development should account for the limited Flash budget and validate debug access during bring-up. This page consolidates verified distributor and manufacturer information with sourcing context and design guidance for compact embedded systems.
Drop-in alternatives for MC9S08QG4CFQE — 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 MC9S08QG4CFQE (same form factor and footprint) — differing in I/O Ports, Package, RoHS Status.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
No drop-in alternatives available for this product.
Request AlternativesMC9S08QG4CFQE Maximum Ratings & Electrical Characteristics
| Product Type | 8-bit HCS08 microcontroller |
| CPU Clock Speed | 20 MHz |
| Architecture | HCS08, HC08 instruction set with added BGND instruction |
| Flash Memory | 4 KB (4K x 8) |
| Supply Voltage Range | 1.8 V to 3.6 V |
| I/O Ports | 6 ports |
| Package | 8-DFN-EP (4 mm x 4 mm) |
| Package Type | DFN with exposed pad |
| Core | 8-bit HCS08 central processing unit |
| Debug Support | Background debugging system |
| Breakpoint Support | Single breakpoint during in-circuit debugging plus two on-chip breakpoints |
| Shipping Package | Tray |
| RoHS Status | RoHS compliant |
MC9S08QG4CFQE tray Pin Configuration Guide
Pin configuration for MC9S08QG4CFQE (tray 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 MC9S08QG4CFQE.
Refer to the datasheet for full pin configuration.
Typical Applications
MC9S08QG4CFQE is suitable for 6 applications: Battery-Powered Sensor Node, Compact Appliance Control, Small Motor-Control Front End, Low-Cost Embedded Module, Simple Serial Interface Hub, Portable Measurement Front End.
Battery-Powered Sensor Node
The MC9S08QG4CFQE fits a compact, low-voltage sensor node when the application can be handled by its 20 MHz 8-bit HCS08 core and 4 KB of Flash memory. Its 1.8 V to 3.6 V supply range simplifies design around common low-energy rails, while six I/O ports can support limited sensor and indicator connections. The main trade-off is the small memory and I/O budget: firmware must be tightly scoped, and the final battery-life calculation requires current-consumption values not included in the verified data.
Recommended
Compact Appliance Control
For a compact appliance-control board, the MC9S08QG4CFQE provides a 20 MHz processing rate, 4 KB Flash and a small 8-DFN-EP footprint. It can handle basic sequencing, button logic, status indication and limited actuator control without a larger package. The exposed-pad construction supports compact placement, but the PCB must provide proper thermal and ground connectivity. Firmware capacity should be checked carefully because the verified 4 KB Flash figure leaves limited room for feature-heavy control code.
Recommended
Small Motor-Control Front End
The MC9S08QG4CFQE can serve as a supervisory control element in a small motor-control design when the main power switching and precision analog functions are handled elsewhere. Its 20 MHz HCS08 core can coordinate commands, timing and digital interlocks, while six I/O ports suit a limited signal set. This is not a claim that the MCU directly drives high-current motors. Designers must add suitable driver, protection and power circuitry and verify timing against the system load.
Recommended
Low-Cost Embedded Module
The MC9S08QG4CFQE is suitable for a small embedded module that needs autonomous control, serial coordination and limited local I/O. Its 20 MHz core provides timing margin, while 4 KB Flash and six I/O ports favor compact, dedicated firmware rather than general-purpose applications. The 1.8 V to 3.6 V operating range supports low-voltage module rails. Before release, validate boot behavior, debug access, decoupling and exposed-pad grounding on the final module stack-up.
Recommended
Simple Serial Interface Hub
A small serial interface hub can use the MC9S08QG4CFQE when the product needs modest protocol handling, status reporting and local control rather than high aggregate throughput. The 20 MHz CPU and background debugging support make firmware bring-up practical, while the six available I/O ports can be allocated among serial signals and indicators. Actual UART, SPI or other peripheral availability and pin mapping must be confirmed from the manufacturer datasheet, because those details were not included in the verified search snippets.
Recommended
Portable Measurement Front End
The MC9S08QG4CFQE can coordinate a portable measurement product when acquisition control, calibration logic and communication fit within a compact low-voltage design. Its 8-bit HCS08 core and 20 MHz clock are appropriate for supervisory functions and modest signal-processing tasks, while 1.8 V to 3.6 V operation supports portable power systems. The package is only 4 mm by 4 mm, reducing board area, but analog accuracy, input limits and ADC requirements are not established by the supplied data and must be checked separately.
Recommended
Engineering reference data for MC9S08QG4CFQE — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product |
|---|---|
| Brand | NXP Semiconductors |
| Package | 8-DFN-EP (4 mm x 4 mm) |
| CPU | 8-bit HCS08 |
| Clock Speed | 20 MHz |
| Flash Memory | 4 KB (4K x 8) |
| Supply Voltage | 1.8 V to 3.6 V |
| I/O Ports | 6 ports |
| Debug Support | Background debugging system |
Key Differentiators
- 20 MHz HCS08 processing rate (vs Lower-frequency 8-bit MCU candidates)
- 4 KB integrated Flash memory (vs Larger-memory 8-bit MCU candidates)
- Low 1.8 V to 3.6 V supply range (vs Higher-voltage-only MCU candidates)
- Compact 8-DFN-EP package (vs Larger-outline SOIC-8 candidates)
Design Notes
Route the exposed pad to the appropriate ground plane according to the NXP package drawing, and place supply decoupling close to the MCU supply connection. The verified package is 8-DFN-EP in a 4 mm by 4 mm footprint, so pad geometry and thermal-via requirements must be checked against the manufacturer land pattern rather than inferred from an SOIC drawing.
Do not substitute an SOIC-8 interpretation for the verified 8-DFN-EP package. The search results contain conflicting generic package descriptions, so the ordering code and manufacturer package drawing should control layout. Confirm pin names, exposed-pad connection and pin numbering before fabrication; an incorrect footprint can prevent assembly or damage the device.
Estimate the system supply margin before selecting supporting regulators. The MCU operates from 1.8 V to 3.6 V, but the provided data does not specify operating current, sleep current or dynamic-current limits. Treat those values as DATA_NEEDED for battery and regulator design, and verify them in the complete NXP electrical characteristics before committing the power architecture.
Keep debug and programming access available during prototype bring-up. The verified description identifies background debugging and breakpoint support, which can shorten firmware troubleshooting. Because the package is compact and the I/O count is limited, assign external interface pins during schematic design rather than improvising connections after layout, and check every signal against the final pin multiplexing requirements.
Compliance Information
The verified search result identifies the part as RoHS compliant. REACH, lead-free, halogen-free and conflict-minerals status were not provided; no assumption has been made.
