MC9S08QE8CWJ - 8-Bit 20MHz 8KB MCU | NXP | Automotive
MPN: MC9S08QE8CWJ ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0 | $0.00 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
MC9S08QE8CWJ Overview
An 8-bit microcontroller is a compact control platform that executes firmware to monitor inputs, operate actuators, and coordinate peripheral functions. The MC9S08QE8CWJ belongs to the S08 family and combines an HCS08 central processing unit with Flash program memory, RAM, communication peripherals, and analog conversion functions in one integrated circuit. This makes it suitable for compact control systems that require deterministic embedded processing without a larger external memory system.
The verified product information identifies an 8-bit CPU operating up to 20 MHz and 8 KB of Flash memory. Mouser lists 512 bytes of RAM, while the NXP product page identifies ACMP, ADC, keyboard, IIC, SCI, and SPI interfaces. The documented operating range in the search data includes CPU operation from 3.6 V down to 1.8 V across a temperature range of 40 °C to 85 °C. These figures define the core suitability of the device for low-voltage embedded automotive and industrial control.
The MC9S08QE8CWJ is marked End of Life by NXP. Engineers should therefore use the manufacturer product page to obtain current purchasing, shipping, discontinuation, and replacement information. The 20-SOIC package is useful when maintaining an existing footprint, but firmware, peripheral compatibility, operating conditions, and supply status must be checked before new production commitments.
Typical applications include automotive body and accessory control, compact sensor interfaces, keypad or human-interface control, low-power monitoring, and small motor or actuator-control boards. The integrated ADC and ACMP allow a design to combine digital control with analog signal conditioning, while SCI, SPI, and IIC support communication with sensors, transceivers, or external controllers.
For PCB design, confirm the exact pin assignments, supply requirements, decoupling recommendations, clock configuration, and programming interface from the manufacturer datasheet. Do not assume that a same-package replacement is firmware-compatible; verify peripheral mapping, memory behavior, interrupt vectors, and timing before substitution.
This page combines the verified NXP, DigiKey, Mouser, and Mouser-datasheet information with practical sourcing and design guidance. Pricing is not supplied in the verified data, so the offer is presented without a fabricated price tier.
Drop-in alternatives for MC9S08QE8CWJ — 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 MC9S08QE8CWJ (same form factor and footprint) — differing in Package, Supply Voltage, ADC, Architecture, RAM.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MC9S08QE8CTGR
✅ Drop-In✓ In Stock
Contact for price
View Datasheet →MC9S08PA4AVWJ
✅ Drop-In📋 Reference alternative (not in catalog)
MC9S08QE32CLCR
✅ Drop-In✓ In Stock
$2.2 / Unit
View Datasheet →MC9S08QE8CWJ Maximum Ratings & Electrical Characteristics
| Product Type | 8-bit HCS08 microcontroller |
| CPU Architecture | 8-bit HCS08 CPU |
| Maximum CPU Frequency | 20 MHz |
| Flash Memory | 8 KB |
| RAM | 512 bytes |
| Supply Voltage | 2.5 V to 3.3 V |
| CPU Voltage Range | 3.6 V to 1.8 V |
| Temperature Range | 40 °C to 85 °C |
| ADC | Integrated |
| ACMP | Integrated |
| KBI | Integrated keyboard interrupt |
| IIC Interface | Integrated IIC |
| SCI Interface | Integrated SCI |
| SPI Interface | Integrated SPI |
| Package | 20-SOIC |
| Lifecycle Status | End of Life |
MC9S08QE8CWJ 20-soic Pin Configuration Guide
Pin configuration for MC9S08QE8CWJ (20-soic 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 MC9S08QE8CWJ.
Refer to the datasheet for full pin configuration.
Typical Applications
MC9S08QE8CWJ is suitable for 6 applications: Automotive Body Control, Sensor Interface Node, Low-Power Monitoring, Keypad and Human Interface Control, Small Motor and Actuator Control, Industrial Communication Module.
Automotive Body Control
The MC9S08QE8CWJ fits compact vehicle body-control tasks where an 8-bit HCS08 CPU, 20 MHz maximum frequency, 8 KB Flash, and 512 bytes of RAM are sufficient for coordinating discrete inputs and outputs. Its integrated ADC and ACMP support monitoring analog vehicle signals, while SCI and SPI can connect to sensors or remote modules. The 20-SOIC package supports existing surface-mount layouts, but automotive production requires confirmation of the exact qualification status because the supplied data identifies the device as End of Life.
Recommended
Sensor Interface Node
For a small sensor node, the MC9S08QE8CWJ combines an integrated ADC, ACMP, IIC, SCI, and SPI interface with 8 KB of Flash and 512 bytes of RAM. This allows one controller to acquire analog inputs, compare thresholds, format local decisions, and communicate with external sensors or actuators without a separate host processor. The 20-SOIC footprint is useful for compact boards, although the final firmware and timing should be checked against the exact manufacturer datasheet because operating-mode power data is not included in the verified snippets.
Recommended
Low-Power Monitoring
MC9S08QE8CWJ is a reasonable platform for periodic monitoring and local control functions because it provides an 8-bit HCS08 CPU, 8 KB Flash, 512 bytes of RAM, ADC, ACMP, and keyboard-interrupt support. A firmware routine can sample analog conditions, debounce external events, and wake a higher-level subsystem through serial communications. The supplied sources do not specify sleep current, wake-up timing, or active-mode current, so battery sizing and power-mode selection require the full NXP datasheet rather than assumptions.
Recommended
Keypad and Human Interface Control
The integrated KBI and ADC resources make the MC9S08QE8CWJ suitable for compact keypad, panel, or menu-control modules. The MCU can scan matrix inputs, interpret analog controls, update local indicators, and transmit state changes through IIC, SCI, or SPI. Its 8-bit architecture and 512 bytes of RAM are appropriate for simple embedded interaction where code size remains under the 8 KB Flash capacity. Firmware developers should confirm interrupt behavior and package-level pin assignments from the official datasheet.
Recommended
Small Motor and Actuator Control
The MC9S08QE8CWJ can serve as the supervisory controller in a compact actuator or small-motor system. A control loop can process sensor feedback, apply state logic, and issue timing commands through available serial interfaces or general-purpose I/O. The 20-SOIC package and 8 KB Flash are useful when the design requires local intelligence without a large memory footprint. Because the verified data does not provide motor-specific timers, output-drive ratings, or protection details, external driver circuitry and timing validation are mandatory.
Recommended
Industrial Communication Module
The combination of SCI, SPI, and IIC interfaces makes MC9S08QE8CWJ suitable for a small communication concentrator or protocol gateway that must acquire local data and forward status. The 8-bit HCS08 CPU at up to 20 MHz provides deterministic control for framing, command parsing, and supervisory logic, while 8 KB Flash stores a compact protocol stack or application firmware. Industrial temperature, EMC, and isolation requirements are not fully represented in the supplied snippets and should be evaluated separately.
Recommended
Recommended Products Summary
Engineering reference data for MC9S08QE8CWJ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MC9S08QE8CTG | MC9S08PA4AVWJ | MC9S08QE32CLCR |
|---|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
Key Differentiators
- Higher verified Flash capacity than the compared MC9S08PA4AVWJ candidate (vs MC9S08PA4AVWJ)
- Matched 20 MHz operating-class comparison (vs MC9S08PA4AVWJ)
- Integrated peripheral set documented for compact embedded designs (vs MC9S08QE8CTG)
Design Notes
Use the manufacturer datasheet to confirm the exact supply-voltage limits and current consumption for the selected clock and operating mode. The verified sources describe a 2.5 V to 3.3 V supply range and a CPU voltage range from 3.6 V to 1.8 V, but these values must not be treated as interchangeable without the datasheet context. Place the required local decoupling directly at the MCU supply pins and design power sequencing so peripherals do not exceed their specified limits.
Preserve the verified 20-SOIC footprint when maintaining an existing MC9S08QE8CWJ design. Before release, compare every pin name, alternate function, programming signal, and no-connect condition against the exact package drawing. A same-outline part can still differ in peripheral mapping or muxing, so schematic and PCB changes must be reviewed as one controlled revision rather than relying only on the package name.
Do not treat MC9S08QE8CTG or MC9S08PA4AVWJ as drop-in replacements without validation. The verified comparison identifies S08QE family or 20-pin similarities, but it does not confirm identical Flash capacity, peripheral behavior, temperature grade, qualification, or lifecycle. Review the manufacturer ordering information and test reset, clock, ADC, communications, interrupts, and programming on production-intent hardware before substitution.
Route communication and analog signals according to the datasheet recommendations, keeping analog inputs away from fast digital switching where practical. The integrated ADC and ACMP can simplify sensing, but their usable accuracy still depends on supply integrity, reference behavior, grounding, and analog filtering. Verify the required external components and signal limits in the full manufacturer datasheet rather than deriving them from the short distributor summaries.
Compliance Information
The supplied verified data does not explicitly state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status. Automotive application wording appears in a distributor listing, but it does not establish AEC-Q100 qualification.